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CVE-2026-66046 (GCVE-0-2026-66046)

Vulnerability from nvd – Published: 2026-08-18 14:10 – Updated: 2026-08-18 14:10 X_Open Source

Title

Expat Denial of Service via storeAtts() Quadratic Complexity

Summary

Expat through 2.8.3 contains a denial of service vulnerability caused by quadratic algorithmic complexity in the storeAtts() function in xmlparse.c, where processing N specified attributes with non-normalized values triggers an O(N^2) linear scan of elementType->defaultAtts to determine CDATA status. A remote unauthenticated attacker can supply a single well-formed XML document of a few megabytes to an application parsing untrusted XML to cause excessive CPU consumption, resulting in denial of service without requiring authentication, external entity resolution, or non-default parser options.

Severity

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE

CWE-407 - Inefficient Algorithmic Complexity

Assigner

VulnCheck mitre root

References

2 references

URL	Tags
https://github.com/libexpat/libexpat/pull/1321	issue-tracking
https://www.vulncheck.com/advisories/expat-denial…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
libexpat project	libexpat	Affected: 0 , ≤ 2.8.3 (semver)

Date Public

2026-08-13 00:00

Credits

Fabian Wahle (Hap Security) Sebastian Pipping VulnCheck

Show details on NVD website

JSON

To clipboard

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CVE-2026-72522 (GCVE-0-2026-72522)

Vulnerability from nvd – Published: 2026-08-10 03:28 – Updated: 2026-08-13 14:08

Summary

libexpat before 2.8.3 has an out-of-bounds read and resultant infinite loop because low surrogates are treated the same as high surrogates during Unicode processing in the *_toUtf16 functions.

Severity

6.2 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-13 12:39 UTC

CWE

CWE-125 - Out-of-bounds Read

Assigner

mitre mitre root

References

3 references

URL	Tags
https://github.com/libexpat/libexpat/pull/1296
https://bugzilla.mozilla.org/show_bug.cgi?id=2053153
http://www.openwall.com/lists/oss-security/2026/08/11/5

Impacted products

1 product

Vendor	Product	Version
libexpat project	libexpat	Affected: 0 , < 2.8.3 (semver) cpe:2.3:a:libexpat_project:libexpat::::::::

Show details on NVD website

JSON

To clipboard

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CVE-2026-56412 (GCVE-0-2026-56412)

Vulnerability from nvd – Published: 2026-06-21 15:58 – Updated: 2026-06-22 16:31

Summary

libexpat before 2.8.2 does not consider XML_TOK_DATA_CHARS in doCdataSection and thus lacks handler call depth tracking for various calls from within handlers in cases of a policy violation. Thus, a use-after-free can occur. NOTE: this issue exists because of an incomplete fix for CVE-2026-50219.

Severity

4.9 (Medium)


                        
                          CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-22 16:30 UTC

CWE

CWE-416 - Use After Free

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://github.com/libexpat/libexpat/pull/1278

Impacted products

1 product

Vendor	Product	Version
libexpat project	libexpat	Affected: 0 , < 2.8.2 (semver) cpe:2.3:a:libexpat_project:libexpat::::::::

Show details on NVD website

JSON

To clipboard

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CVE-2026-56411 (GCVE-0-2026-56411)

Vulnerability from nvd – Published: 2026-06-21 15:56 – Updated: 2026-06-22 16:31

Summary

xmlwf in libexpat before 2.8.2 has an integer overflow in endDoctypeDecl via NOTATION declarations.

Severity

6.9 (Medium)


                        
                          CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-22 16:31 UTC

CWE

CWE-190 - Integer Overflow or Wraparound

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://github.com/libexpat/libexpat/pull/1263

Impacted products

1 product

Vendor	Product	Version
libexpat project	libexpat	Affected: 0 , < 2.8.2 (semver) cpe:2.3:a:libexpat_project:libexpat::::::::

Show details on NVD website

JSON

To clipboard

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CVE-2026-56410 (GCVE-0-2026-56410)

Vulnerability from nvd – Published: 2026-06-21 15:55 – Updated: 2026-06-22 15:56

Summary

xmlwf in libexpat before 2.8.2 has an integer overflow in resolveSystemId.

Severity

6.9 (Medium)


                        
                          CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-22 15:56 UTC

CWE

CWE-190 - Integer Overflow or Wraparound

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://github.com/libexpat/libexpat/pull/1252

Impacted products

1 product

Vendor	Product	Version
libexpat project	libexpat	Affected: 0 , < 2.8.2 (semver) cpe:2.3:a:libexpat_project:libexpat::::::::

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CVE-2026-56409 (GCVE-0-2026-56409)

Vulnerability from nvd – Published: 2026-06-21 15:52 – Updated: 2026-06-22 15:56

Summary

xmlwf in libexpat before 2.8.2 has an integer overflow for the output filename when -d outputDir is used.

Severity

6.5 (Medium)


                        
                          CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-22 15:56 UTC

CWE

CWE-190 - Integer Overflow or Wraparound

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://github.com/libexpat/libexpat/pull/1259

Impacted products

1 product

Vendor	Product	Version
libexpat project	libexpat	Affected: 0 , < 2.8.2 (semver) cpe:2.3:a:libexpat_project:libexpat::::::::

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CVE-2026-56408 (GCVE-0-2026-56408)

Vulnerability from nvd – Published: 2026-06-21 15:51 – Updated: 2026-06-22 15:55

Summary

libexpat before 2.8.2 has an integer overflow in copyString.

Severity

6.9 (Medium)


                        
                          CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-22 15:55 UTC

CWE

CWE-190 - Integer Overflow or Wraparound

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://github.com/libexpat/libexpat/commit/16e2e…

Impacted products

1 product

Vendor	Product	Version
libexpat project	libexpat	Affected: 0 , < 2.8.2 (semver) cpe:2.3:a:libexpat_project:libexpat::::::::

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JSON

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CVE-2026-56407 (GCVE-0-2026-56407)

Vulnerability from nvd – Published: 2026-06-21 15:49 – Updated: 2026-06-22 15:55

Summary

libexpat before 2.8.2 has an integer overflow in doProlog that is related to storeEntityValue and entity textLen.

Severity

6.9 (Medium)


                        
                          CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-22 15:54 UTC

CWE

CWE-190 - Integer Overflow or Wraparound

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://github.com/libexpat/libexpat/pull/1262

Impacted products

1 product

Vendor	Product	Version
libexpat project	libexpat	Affected: 0 , < 2.8.2 (semver) cpe:2.3:a:libexpat_project:libexpat::::::::

Show details on NVD website

JSON

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CVE-2026-56406 (GCVE-0-2026-56406)

Vulnerability from nvd – Published: 2026-06-21 15:48 – Updated: 2026-06-22 17:02

Summary

libexpat before 2.8.2 has an integer overflow in XML_ParseBuffer because it lacked a check that was present in XML_Parse.

Severity

6.9 (Medium)


                        
                          CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-22 17:02 UTC

CWE

CWE-190 - Integer Overflow or Wraparound

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://github.com/libexpat/libexpat/pull/1255

Impacted products

1 product

Vendor	Product	Version
libexpat project	libexpat	Affected: 0 , < 2.8.2 (semver) cpe:2.3:a:libexpat_project:libexpat::::::::

Show details on NVD website

JSON

To clipboard

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CVE-2026-56405 (GCVE-0-2026-56405)

Vulnerability from nvd – Published: 2026-06-21 15:47 – Updated: 2026-06-22 17:03

Summary

libexpat before 2.8.2 has an integer overflow in getAttributeId.

Severity

6.9 (Medium)


                        
                          CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-22 17:03 UTC

CWE

CWE-190 - Integer Overflow or Wraparound

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://github.com/libexpat/libexpat/pull/1251

Impacted products

1 product

Vendor	Product	Version
libexpat project	libexpat	Affected: 0 , < 2.8.2 (semver) cpe:2.3:a:libexpat_project:libexpat::::::::

Show details on NVD website

JSON

To clipboard

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CVE-2026-56404 (GCVE-0-2026-56404)

Vulnerability from nvd – Published: 2026-06-21 15:45 – Updated: 2026-06-22 17:05

Summary

libexpat before 2.8.2 has an integer overflow in addBinding.

Severity

6.9 (Medium)


                        
                          CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-22 17:04 UTC

CWE

CWE-190 - Integer Overflow or Wraparound

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://github.com/libexpat/libexpat/pull/1249

Impacted products

1 product

Vendor	Product	Version
libexpat project	libexpat	Affected: 0 , < 2.8.2 (semver) cpe:2.3:a:libexpat_project:libexpat::::::::

Show details on NVD website

JSON

To clipboard

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CVE-2026-56403 (GCVE-0-2026-56403)

Vulnerability from nvd – Published: 2026-06-21 15:43 – Updated: 2026-06-22 17:05

Summary

libexpat before 2.8.2 has an integer overflow in storeAtts.

Severity

6.9 (Medium)


                        
                          CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-22 17:05 UTC

CWE

CWE-190 - Integer Overflow or Wraparound

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://github.com/libexpat/libexpat/pull/1232

Impacted products

1 product

Vendor	Product	Version
libexpat project	libexpat	Affected: 0 , < 2.8.2 (semver) cpe:2.3:a:libexpat_project:libexpat::::::::

Show details on NVD website

JSON

To clipboard

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CVE-2026-56132 (GCVE-0-2026-56132)

Vulnerability from nvd – Published: 2026-06-19 03:00 – Updated: 2026-06-22 14:59

Summary

In libexpat before 2.8.2, there is a heap-based buffer overflow in doProlog in xmlparse.c because scaffold backing array reallocation is mishandled when there is data-structure sharing across parsers.

Severity

6.9 (Medium)


                        
                          CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-22 14:59 UTC

CWE

CWE-821 - Incorrect Synchronization

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://github.com/libexpat/libexpat/pull/1272

Impacted products

1 product

Vendor	Product	Version
libexpat project	libexpat	Affected: 0 , < 2.8.2 (semver) cpe:2.3:a:libexpat_project:libexpat::::::::

Show details on NVD website

JSON

To clipboard

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CVE-2026-56131 (GCVE-0-2026-56131)

Vulnerability from nvd – Published: 2026-06-19 02:56 – Updated: 2026-06-22 14:58

Summary

libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_ResumeParser from within handlers in cases of a policy violation. Thus, a use-after-free can occur (similar to the CVE-2026-50219 situation).

Severity

4.9 (Medium)


                        
                          CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-22 14:58 UTC

CWE

CWE-416 - Use After Free

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://github.com/libexpat/libexpat/pull/1267

Impacted products

1 product

Vendor	Product	Version
libexpat project	libexpat	Affected: 0 , < 2.8.2 (semver) cpe:2.3:a:libexpat_project:libexpat::::::::

Show details on NVD website

JSON

To clipboard

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CVE-2026-50219 (GCVE-0-2026-50219)

Vulnerability from nvd – Published: 2026-06-04 04:20 – Updated: 2026-06-04 12:36

Summary

libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_GetBuffer, XML_Parse, XML_ParseBuffer, XML_ParserFree, or XML_ParserReset from within handlers in cases of a policy violation. Thus, a use-after-free can occur,

Severity

4.9 (Medium)


                        
                          CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-04 12:36 UTC

CWE

CWE-416 - Use After Free

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://github.com/libexpat/libexpat/pull/1246

Impacted products

1 product

Vendor	Product	Version
libexpat project	libexpat	Affected: 0 , < 2.8.2 (semver) cpe:2.3:a:libexpat_project:libexpat::::::::

Show details on NVD website

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To clipboard

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CVE-2026-66046 (GCVE-0-2026-66046)

Vulnerability from cvelistv5 – Published: 2026-08-18 14:10 – Updated: 2026-08-18 14:10 X_Open Source

Title

Expat Denial of Service via storeAtts() Quadratic Complexity

Summary

Expat through 2.8.3 contains a denial of service vulnerability caused by quadratic algorithmic complexity in the storeAtts() function in xmlparse.c, where processing N specified attributes with non-normalized values triggers an O(N^2) linear scan of elementType->defaultAtts to determine CDATA status. A remote unauthenticated attacker can supply a single well-formed XML document of a few megabytes to an application parsing untrusted XML to cause excessive CPU consumption, resulting in denial of service without requiring authentication, external entity resolution, or non-default parser options.

Severity

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE

CWE-407 - Inefficient Algorithmic Complexity

Assigner

VulnCheck mitre root

References

2 references

URL	Tags
https://github.com/libexpat/libexpat/pull/1321	issue-tracking
https://www.vulncheck.com/advisories/expat-denial…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
libexpat project	libexpat	Affected: 0 , ≤ 2.8.3 (semver)

Date Public

2026-08-13 00:00

Credits

Fabian Wahle (Hap Security) Sebastian Pipping VulnCheck

Show details on NVD website

JSON

To clipboard

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CVE-2026-72522 (GCVE-0-2026-72522)

Vulnerability from cvelistv5 – Published: 2026-08-10 03:28 – Updated: 2026-08-13 14:08

Summary

libexpat before 2.8.3 has an out-of-bounds read and resultant infinite loop because low surrogates are treated the same as high surrogates during Unicode processing in the *_toUtf16 functions.

Severity

6.2 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-13 12:39 UTC

CWE

CWE-125 - Out-of-bounds Read

Assigner

mitre mitre root

References

3 references

URL	Tags
https://github.com/libexpat/libexpat/pull/1296
https://bugzilla.mozilla.org/show_bug.cgi?id=2053153
http://www.openwall.com/lists/oss-security/2026/08/11/5

Impacted products

1 product

Vendor	Product	Version
libexpat project	libexpat	Affected: 0 , < 2.8.3 (semver) cpe:2.3:a:libexpat_project:libexpat::::::::

Show details on NVD website

JSON

To clipboard

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CVE-2026-56412 (GCVE-0-2026-56412)

Vulnerability from cvelistv5 – Published: 2026-06-21 15:58 – Updated: 2026-06-22 16:31

Summary

libexpat before 2.8.2 does not consider XML_TOK_DATA_CHARS in doCdataSection and thus lacks handler call depth tracking for various calls from within handlers in cases of a policy violation. Thus, a use-after-free can occur. NOTE: this issue exists because of an incomplete fix for CVE-2026-50219.

Severity

4.9 (Medium)


                        
                          CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-22 16:30 UTC

CWE

CWE-416 - Use After Free

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://github.com/libexpat/libexpat/pull/1278

Impacted products

1 product

Vendor	Product	Version
libexpat project	libexpat	Affected: 0 , < 2.8.2 (semver) cpe:2.3:a:libexpat_project:libexpat::::::::

Show details on NVD website

JSON

To clipboard

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CVE-2026-56411 (GCVE-0-2026-56411)

Vulnerability from cvelistv5 – Published: 2026-06-21 15:56 – Updated: 2026-06-22 16:31

Summary

xmlwf in libexpat before 2.8.2 has an integer overflow in endDoctypeDecl via NOTATION declarations.

Severity

6.9 (Medium)


                        
                          CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-22 16:31 UTC

CWE

CWE-190 - Integer Overflow or Wraparound

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://github.com/libexpat/libexpat/pull/1263

Impacted products

1 product

Vendor	Product	Version
libexpat project	libexpat	Affected: 0 , < 2.8.2 (semver) cpe:2.3:a:libexpat_project:libexpat::::::::

Show details on NVD website

JSON

To clipboard

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CVE-2026-56410 (GCVE-0-2026-56410)

Vulnerability from cvelistv5 – Published: 2026-06-21 15:55 – Updated: 2026-06-22 15:56

Summary

xmlwf in libexpat before 2.8.2 has an integer overflow in resolveSystemId.

Severity

6.9 (Medium)


                        
                          CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-22 15:56 UTC

CWE

CWE-190 - Integer Overflow or Wraparound

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://github.com/libexpat/libexpat/pull/1252

Impacted products

1 product

Vendor	Product	Version
libexpat project	libexpat	Affected: 0 , < 2.8.2 (semver) cpe:2.3:a:libexpat_project:libexpat::::::::

Show details on NVD website

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CVE-2026-56409 (GCVE-0-2026-56409)

Vulnerability from cvelistv5 – Published: 2026-06-21 15:52 – Updated: 2026-06-22 15:56

Summary

xmlwf in libexpat before 2.8.2 has an integer overflow for the output filename when -d outputDir is used.

Severity

6.5 (Medium)


                        
                          CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-22 15:56 UTC

CWE

CWE-190 - Integer Overflow or Wraparound

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://github.com/libexpat/libexpat/pull/1259

Impacted products

1 product

Vendor	Product	Version
libexpat project	libexpat	Affected: 0 , < 2.8.2 (semver) cpe:2.3:a:libexpat_project:libexpat::::::::

Show details on NVD website

JSON

To clipboard

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CVE-2026-56408 (GCVE-0-2026-56408)

Vulnerability from cvelistv5 – Published: 2026-06-21 15:51 – Updated: 2026-06-22 15:55

Summary

libexpat before 2.8.2 has an integer overflow in copyString.

Severity

6.9 (Medium)


                        
                          CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-22 15:55 UTC

CWE

CWE-190 - Integer Overflow or Wraparound

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://github.com/libexpat/libexpat/commit/16e2e…

Impacted products

1 product

Vendor	Product	Version
libexpat project	libexpat	Affected: 0 , < 2.8.2 (semver) cpe:2.3:a:libexpat_project:libexpat::::::::

Show details on NVD website

JSON

To clipboard

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CVE-2026-56407 (GCVE-0-2026-56407)

Vulnerability from cvelistv5 – Published: 2026-06-21 15:49 – Updated: 2026-06-22 15:55

Summary

libexpat before 2.8.2 has an integer overflow in doProlog that is related to storeEntityValue and entity textLen.

Severity

6.9 (Medium)


                        
                          CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-22 15:54 UTC

CWE

CWE-190 - Integer Overflow or Wraparound

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://github.com/libexpat/libexpat/pull/1262

Impacted products

1 product

Vendor	Product	Version
libexpat project	libexpat	Affected: 0 , < 2.8.2 (semver) cpe:2.3:a:libexpat_project:libexpat::::::::

Show details on NVD website

JSON

To clipboard

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CVE-2026-56406 (GCVE-0-2026-56406)

Vulnerability from cvelistv5 – Published: 2026-06-21 15:48 – Updated: 2026-06-22 17:02

Summary

libexpat before 2.8.2 has an integer overflow in XML_ParseBuffer because it lacked a check that was present in XML_Parse.

Severity

6.9 (Medium)


                        
                          CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-22 17:02 UTC

CWE

CWE-190 - Integer Overflow or Wraparound

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://github.com/libexpat/libexpat/pull/1255

Impacted products

1 product

Vendor	Product	Version
libexpat project	libexpat	Affected: 0 , < 2.8.2 (semver) cpe:2.3:a:libexpat_project:libexpat::::::::

Show details on NVD website

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CVE-2026-56405 (GCVE-0-2026-56405)

Vulnerability from cvelistv5 – Published: 2026-06-21 15:47 – Updated: 2026-06-22 17:03

Summary

libexpat before 2.8.2 has an integer overflow in getAttributeId.

Severity

6.9 (Medium)


                        
                          CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-22 17:03 UTC

CWE

CWE-190 - Integer Overflow or Wraparound

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://github.com/libexpat/libexpat/pull/1251

Impacted products

1 product

Vendor	Product	Version
libexpat project	libexpat	Affected: 0 , < 2.8.2 (semver) cpe:2.3:a:libexpat_project:libexpat::::::::

Show details on NVD website

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To clipboard

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CVE-2026-56404 (GCVE-0-2026-56404)

Vulnerability from cvelistv5 – Published: 2026-06-21 15:45 – Updated: 2026-06-22 17:05

Summary

libexpat before 2.8.2 has an integer overflow in addBinding.

Severity

6.9 (Medium)


                        
                          CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-22 17:04 UTC

CWE

CWE-190 - Integer Overflow or Wraparound

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://github.com/libexpat/libexpat/pull/1249

Impacted products

1 product

Vendor	Product	Version
libexpat project	libexpat	Affected: 0 , < 2.8.2 (semver) cpe:2.3:a:libexpat_project:libexpat::::::::

Show details on NVD website

JSON

To clipboard

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CVE-2026-56403 (GCVE-0-2026-56403)

Vulnerability from cvelistv5 – Published: 2026-06-21 15:43 – Updated: 2026-06-22 17:05

Summary

libexpat before 2.8.2 has an integer overflow in storeAtts.

Severity

6.9 (Medium)


                        
                          CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-22 17:05 UTC

CWE

CWE-190 - Integer Overflow or Wraparound

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://github.com/libexpat/libexpat/pull/1232

Impacted products

1 product

Vendor	Product	Version
libexpat project	libexpat	Affected: 0 , < 2.8.2 (semver) cpe:2.3:a:libexpat_project:libexpat::::::::

Show details on NVD website

JSON

To clipboard

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CVE-2026-56132 (GCVE-0-2026-56132)

Vulnerability from cvelistv5 – Published: 2026-06-19 03:00 – Updated: 2026-06-22 14:59

Summary

In libexpat before 2.8.2, there is a heap-based buffer overflow in doProlog in xmlparse.c because scaffold backing array reallocation is mishandled when there is data-structure sharing across parsers.

Severity

6.9 (Medium)


                        
                          CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-22 14:59 UTC

CWE

CWE-821 - Incorrect Synchronization

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://github.com/libexpat/libexpat/pull/1272

Impacted products

1 product

Vendor	Product	Version
libexpat project	libexpat	Affected: 0 , < 2.8.2 (semver) cpe:2.3:a:libexpat_project:libexpat::::::::

Show details on NVD website

JSON

To clipboard

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CVE-2026-56131 (GCVE-0-2026-56131)

Vulnerability from cvelistv5 – Published: 2026-06-19 02:56 – Updated: 2026-06-22 14:58

Summary

libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_ResumeParser from within handlers in cases of a policy violation. Thus, a use-after-free can occur (similar to the CVE-2026-50219 situation).

Severity

4.9 (Medium)


                        
                          CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-22 14:58 UTC

CWE

CWE-416 - Use After Free

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://github.com/libexpat/libexpat/pull/1267

Impacted products

1 product

Vendor	Product	Version
libexpat project	libexpat	Affected: 0 , < 2.8.2 (semver) cpe:2.3:a:libexpat_project:libexpat::::::::

Show details on NVD website

JSON

To clipboard

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CVE-2026-50219 (GCVE-0-2026-50219)

Vulnerability from cvelistv5 – Published: 2026-06-04 04:20 – Updated: 2026-06-04 12:36

Summary

libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_GetBuffer, XML_Parse, XML_ParseBuffer, XML_ParserFree, or XML_ParserReset from within handlers in cases of a policy violation. Thus, a use-after-free can occur,

Severity

4.9 (Medium)


                        
                          CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-04 12:36 UTC

CWE

CWE-416 - Use After Free

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://github.com/libexpat/libexpat/pull/1246

Impacted products

1 product

Vendor	Product	Version
libexpat project	libexpat	Affected: 0 , < 2.8.2 (semver) cpe:2.3:a:libexpat_project:libexpat::::::::

Show details on NVD website

JSON

To clipboard

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Find a vulnerability

Search criteria ⓘ Use this form to refine search results.
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48 vulnerabilities found for libexpat by libexpat project

CVE-2026-66046 (GCVE-0-2026-66046)

CVE-2026-72522 (GCVE-0-2026-72522)

CVE-2026-56412 (GCVE-0-2026-56412)

CVE-2026-56411 (GCVE-0-2026-56411)

CVE-2026-56410 (GCVE-0-2026-56410)

CVE-2026-56409 (GCVE-0-2026-56409)

CVE-2026-56408 (GCVE-0-2026-56408)

CVE-2026-56407 (GCVE-0-2026-56407)

CVE-2026-56406 (GCVE-0-2026-56406)

CVE-2026-56405 (GCVE-0-2026-56405)

CVE-2026-56404 (GCVE-0-2026-56404)

CVE-2026-56403 (GCVE-0-2026-56403)

CVE-2026-56132 (GCVE-0-2026-56132)

CVE-2026-56131 (GCVE-0-2026-56131)

CVE-2026-50219 (GCVE-0-2026-50219)

CVE-2026-66046 (GCVE-0-2026-66046)

CVE-2026-72522 (GCVE-0-2026-72522)

CVE-2026-56412 (GCVE-0-2026-56412)

CVE-2026-56411 (GCVE-0-2026-56411)

CVE-2026-56410 (GCVE-0-2026-56410)

CVE-2026-56409 (GCVE-0-2026-56409)

CVE-2026-56408 (GCVE-0-2026-56408)

CVE-2026-56407 (GCVE-0-2026-56407)

CVE-2026-56406 (GCVE-0-2026-56406)

CVE-2026-56405 (GCVE-0-2026-56405)

CVE-2026-56404 (GCVE-0-2026-56404)

CVE-2026-56403 (GCVE-0-2026-56403)

CVE-2026-56132 (GCVE-0-2026-56132)

CVE-2026-56131 (GCVE-0-2026-56131)

CVE-2026-50219 (GCVE-0-2026-50219)

Find a vulnerability

Search criteria ⓘ Use this form to refine search results. Full-text search supports keyword queries with ranking and filtering. You can combine vendor, product, and sources to narrow results. Enable “Apply ordering” to sort by date instead of relevance.

48 vulnerabilities found for libexpat by libexpat project

CVE-2026-66046 (GCVE-0-2026-66046)

CVE-2026-72522 (GCVE-0-2026-72522)

CVE-2026-56412 (GCVE-0-2026-56412)

CVE-2026-56411 (GCVE-0-2026-56411)

CVE-2026-56410 (GCVE-0-2026-56410)

CVE-2026-56409 (GCVE-0-2026-56409)

CVE-2026-56408 (GCVE-0-2026-56408)

CVE-2026-56407 (GCVE-0-2026-56407)

CVE-2026-56406 (GCVE-0-2026-56406)

CVE-2026-56405 (GCVE-0-2026-56405)

CVE-2026-56404 (GCVE-0-2026-56404)

CVE-2026-56403 (GCVE-0-2026-56403)

CVE-2026-56132 (GCVE-0-2026-56132)

CVE-2026-56131 (GCVE-0-2026-56131)

CVE-2026-50219 (GCVE-0-2026-50219)

CVE-2026-66046 (GCVE-0-2026-66046)

CVE-2026-72522 (GCVE-0-2026-72522)

CVE-2026-56412 (GCVE-0-2026-56412)

CVE-2026-56411 (GCVE-0-2026-56411)

CVE-2026-56410 (GCVE-0-2026-56410)

CVE-2026-56409 (GCVE-0-2026-56409)

CVE-2026-56408 (GCVE-0-2026-56408)

CVE-2026-56407 (GCVE-0-2026-56407)

CVE-2026-56406 (GCVE-0-2026-56406)

CVE-2026-56405 (GCVE-0-2026-56405)

CVE-2026-56404 (GCVE-0-2026-56404)

CVE-2026-56403 (GCVE-0-2026-56403)

CVE-2026-56132 (GCVE-0-2026-56132)

CVE-2026-56131 (GCVE-0-2026-56131)

CVE-2026-50219 (GCVE-0-2026-50219)

Search criteria ⓘ Use this form to refine search results.
Full-text search supports keyword queries with ranking and filtering.
You can combine vendor, product, and sources to narrow results.
Enable “Apply ordering” to sort by date instead of relevance.