Vulnerability-Lookup

OESA-2026-2409 (CVE-2026-5450)

Vulnerability from osv_openeuler – Published: 2026-05-22 11:11 – Updated: 2026-08-06 11:11 – Source website

Summary

glibc security update

Details

The GNU C Library project provides the core libraries for the GNU system and GNU/Linux systems, as well as many other systems that use Linux as the kernel. These libraries provide critical APIs including ISO C11, POSIX.1-2008, BSD, OS-specific APIs and more. These APIs include such foundational facilities as open, read, write, malloc, printf, getaddrinfo, dlopen, pthread_create, crypt, login, exit and more.

Security Fix(es):

Calling the scanf family of functions with a %mc (malloc'd character match) in the GNU C Library version 2.7 to version 2.43 with a format width specifier with an explicit width greater than 1024 could result in a one byte heap buffer overflow.(CVE-2026-5450)

A bug in the wide character pushback implementation (_IO_wdefault_pbackfail in libio/wgenops.c) causes ungetwc() to operate on the regular character buffer (fp->_IO_read_ptr) instead of the actual wide-stream read pointer (fp->_wide_data->_IO_read_ptr). The program crash may happen in cases where fp->_IO_read_ptr is not initialized and hence points to NULL. The buffer under-read requires a special situation where the input character encoding is such that there are overlaps between single byte representations and multibyte representations in that encoding, resulting in spurious matches. The spurious match case is not possible in the standard Unicode character sets.(CVE-2026-5928)

Severity

9.8 (Critical)


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

References

URL

Type

	https://www.openeuler.org/zh/security/security-bu…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-5450	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-5928	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "glibc-2.28-124.oe2003sp4.aarch64.rpm",
          "glibc-all-langpacks-2.28-124.oe2003sp4.aarch64.rpm",
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          "glibc-common-2.28-124.oe2003sp4.aarch64.rpm",
          "glibc-compat-2.17-2.28-124.oe2003sp4.aarch64.rpm",
          "glibc-debuginfo-2.28-124.oe2003sp4.aarch64.rpm",
          "glibc-debugsource-2.28-124.oe2003sp4.aarch64.rpm",
          "glibc-debugutils-2.28-124.oe2003sp4.aarch64.rpm",
          "glibc-devel-2.28-124.oe2003sp4.aarch64.rpm",
          "glibc-locale-source-2.28-124.oe2003sp4.aarch64.rpm",
          "glibc-nss-devel-2.28-124.oe2003sp4.aarch64.rpm",
          "libnsl-2.28-124.oe2003sp4.aarch64.rpm",
          "nscd-2.28-124.oe2003sp4.aarch64.rpm",
          "nss_modules-2.28-124.oe2003sp4.aarch64.rpm"
        ],
        "noarch": [
          "glibc-help-2.28-124.oe2003sp4.noarch.rpm"
        ],
        "src": [
          "glibc-2.28-124.oe2003sp4.src.rpm"
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  "details": "The GNU C Library project provides the core libraries for the GNU system and GNU/Linux systems, as well as many other systems that use Linux as the kernel. These libraries provide critical APIs including ISO C11, POSIX.1-2008, BSD, OS-specific APIs and more. These APIs include such foundational facilities as open, read, write, malloc, printf, getaddrinfo, dlopen, pthread_create, crypt,  login, exit and more.\r\n\r\nSecurity Fix(es):\n\nCalling the scanf family of functions with a %mc (malloc\u0026apos;d character match) in the GNU C Library version 2.7 to version 2.43 with a format width specifier with an explicit width greater than 1024 could result in a one byte heap buffer overflow.(CVE-2026-5450)\n\nCalling the ungetwc function on a FILE stream with wide characters encoded in a character set that has overlaps between its single byte and multi-byte character encodings, in the GNU C Library version 2.43 or earlier, may result in an attempt to read bytes before an allocated buffer, potentially resulting in unintentional disclosure of neighboring data in the heap, or a program crash.\n\nA bug in the wide character pushback implementation (_IO_wdefault_pbackfail in libio/wgenops.c) causes ungetwc() to operate on the regular character buffer (fp-\u0026gt;_IO_read_ptr) instead of the actual wide-stream read pointer (fp-\u0026gt;_wide_data-\u0026gt;_IO_read_ptr). The program crash may happen in cases where fp-\u0026gt;_IO_read_ptr is not initialized and hence points to NULL. The buffer under-read requires a special situation where the input character encoding is such that there are overlaps between single byte representations and multibyte representations in that encoding, resulting in spurious matches. The spurious match case is not possible in the standard Unicode character sets.(CVE-2026-5928)",
  "id": "OESA-2026-2409",
  "modified": "2026-08-06T11:11:22Z",
  "published": "2026-05-22T11:11:22Z",
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      "type": "ADVISORY",
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      "type": "ADVISORY",
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    },
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  ]
}

CVE-2026-5450 (GCVE-0-2026-5450)

Vulnerability from cvelistv5 – Published: 2026-04-20 20:55 – Updated: 2026-07-14 12:45

Title

scanf %mc off-by-one heap buffer overflow

Summary

Severity

9.8 (Critical)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-21 16:11 UTC

CWE

CWE-122 - Heap-based buffer overflow

Assigner

glibc redhat root

References

3 references

URL	Tags
https://sourceware.org/bugzilla/show_bug.cgi?id=C…	issue-tracking
https://inbox.sourceware.org/libc-announce/b11f00…	mailing-list
https://cert-portal.siemens.com/productcert/html/…

Impacted products

4 products

Vendor	Product	Version
The GNU C Library	glibc	Affected: 2.7 , < * (custom)
Siemens	SIMATIC S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.5 , < V3.1.6 (custom)
Siemens	SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP	Affected: V3.1.5 , < V3.1.6 (custom)
Siemens	SIPLUS S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.5 , < V3.1.6 (custom)

Date Public

2026-03-19 17:36

Credits

Rocket Ma

Show details on NVD website

JSON

To clipboard

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CVE-2026-5928 (GCVE-0-2026-5928)

Vulnerability from cvelistv5 – Published: 2026-04-20 20:37 – Updated: 2026-07-14 12:45

Title

Potential buffer under-read in ungetwc

Summary

Calling the ungetwc function on a FILE stream with wide characters encoded in a character set that has overlaps between its single byte and multi-byte character encodings, in the GNU C Library version 2.43 or earlier, may result in an attempt to read bytes before an allocated buffer, potentially resulting in unintentional disclosure of neighboring data in the heap, or a program crash. A bug in the wide character pushback implementation (_IO_wdefault_pbackfail in libio/wgenops.c) causes ungetwc() to operate on the regular character buffer (fp->_IO_read_ptr) instead of the actual wide-stream read pointer (fp->_wide_data->_IO_read_ptr). The program crash may happen in cases where fp->_IO_read_ptr is not initialized and hence points to NULL. The buffer under-read requires a special situation where the input character encoding is such that there are overlaps between single byte representations and multibyte representations in that encoding, resulting in spurious matches. The spurious match case is not possible in the standard Unicode character sets.

Severity

7.5 (High)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-21 16:10 UTC

CWE

CWE-127 - Buffer under-read

Assigner

glibc redhat root

References

2 references

URL	Tags
https://sourceware.org/bugzilla/show_bug.cgi?id=33998
https://cert-portal.siemens.com/productcert/html/…

Impacted products

4 products

Vendor	Product	Version
The GNU C Library	glibc	Affected: 2.1.1-89 , ≤ 2.43 (custom)
Siemens	SIMATIC S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.5 , < V3.1.6 (custom)
Siemens	SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP	Affected: V3.1.5 , < V3.1.6 (custom)
Siemens	SIPLUS S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.5 , < V3.1.6 (custom)

Credits

Rocket Ma

Show details on NVD website

JSON

To clipboard

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            }
          ],
          "value": "Calling the ungetwc function on a FILE stream with wide characters encoded in a character set that has overlaps between its single byte and multi-byte character encodings, in the GNU C Library version 2.43 or earlier, may result in an attempt to read bytes before an allocated buffer, potentially resulting in unintentional disclosure of neighboring data in the heap, or a program crash.\n\nA bug in the wide character pushback implementation (_IO_wdefault_pbackfail in libio/wgenops.c) causes ungetwc() to operate on the regular character buffer (fp-\u003e_IO_read_ptr) instead of the actual wide-stream read pointer (fp-\u003e_wide_data-\u003e_IO_read_ptr). The program crash may happen in cases where fp-\u003e_IO_read_ptr is not initialized and hence points to NULL. The buffer under-read requires a special situation where the input character encoding is such that there are overlaps between single byte representations and multibyte representations in that encoding, resulting in spurious matches. The spurious match case is not possible in the standard Unicode character sets."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-540",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-540 Overread Buffers"
            }
          ]
        },
        {
          "capecId": "CAPEC-267",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-267 Leverage Alternate Encoding"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-127",
              "description": "CWE-127 Buffer under-read",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-30T15:43:07.240Z",
        "orgId": "3ff69d7a-14f2-4f67-a097-88dee7810d18",
        "shortName": "glibc"
      },
      "references": [
        {
          "url": "https://sourceware.org/bugzilla/show_bug.cgi?id=33998"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Potential buffer under-read in ungetwc",
      "x_generator": {
        "engine": "Vulnogram 1.0.1"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "3ff69d7a-14f2-4f67-a097-88dee7810d18",
    "assignerShortName": "glibc",
    "cveId": "CVE-2026-5928",
    "datePublished": "2026-04-20T20:37:31.743Z",
    "dateReserved": "2026-04-08T22:47:29.814Z",
    "dateUpdated": "2026-07-14T12:45:32.067Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Confirmed: The vulnerability has been validated from an analyst's perspective.
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Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

OESA-2026-2409 (CVE-2026-5450)

CVE-2026-5450 (GCVE-0-2026-5450)

CVE-2026-5928 (GCVE-0-2026-5928)

Tags

Sightings

Nomenclature

Related by attack behaviour