Vulnerability-Lookup

RHSA-2026:35813

Vulnerability from csaf_redhat - Published: 2026-07-05 20:02 - Updated: 2026-09-06 22:30

Summary

Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

Severity

Moderate

Notes

Topic: An update for Red Hat Hardened Images RPMs is now available.

Details: This update includes the following RPMs: python3.12: * python3.12-3.12.13-3.3.hum1 (aarch64, x86_64) * python3.12-debug-3.12.13-3.3.hum1 (aarch64, x86_64) * python3.12-devel-3.12.13-3.3.hum1 (aarch64, x86_64) * python3.12-idle-3.12.13-3.3.hum1 (aarch64, x86_64) * python3.12-libs-3.12.13-3.3.hum1 (aarch64, x86_64) * python3.12-test-3.12.13-3.3.hum1 (aarch64, x86_64) * python3.12-tkinter-3.12.13-3.3.hum1 (aarch64, x86_64) * python3.12-3.12.13-3.3.hum1.src (src) Security Fix(es): python3.12: * CVE-2026-11972

Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

CVE-2026-11972

A flaw was found in the Python `tarfile` module. When processing a specially crafted tar archive opened in 'streaming mode' (mode='r|'), the module does not properly handle the end-of-file (EOF) condition. This can cause the `tarfile` module to enter an infinite loop, leading to a Denial of Service (DoS) for applications processing such archives.

6.5 (Medium)


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

CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Affected products

Fixed 3 products

Product	Version	Remediation
Unresolved product id: Red Hat Hardened Images:python3-12-main@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:python3-12-main@src	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:python3-12-main@x86_64	—	Vendor Fix fix Workaround

Threats

Impact Moderate

References

12 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:35813	self
https://access.redhat.com/security/cve/CVE-2026-11972	external
https://access.redhat.com/security/updates/classi…	external
https://images.redhat.com/	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-11972	self
https://bugzilla.redhat.com/show_bug.cgi?id=2492050	external
https://www.cve.org/CVERecord?id=CVE-2026-11972	external
https://nvd.nist.gov/vuln/detail/CVE-2026-11972	external
https://github.com/python/cpython/issues/151981	external
https://github.com/python/cpython/pull/151982	external
https://mail.python.org/archives/list/security-an…	external

JSON

To clipboard

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      },
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      "ids": [
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          "text": "A flaw was found in the Python `tarfile` module. When processing a specially crafted tar archive opened in \u0027streaming mode\u0027 (mode=\u0027r|\u0027), the module does not properly handle the end-of-file (EOF) condition. This can cause the `tarfile` module to enter an infinite loop, leading to a Denial of Service (DoS) for applications processing such archives.",
          "title": "Vulnerability description"
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          "text": "python: Python tarfile module: Denial of Service via improper EOF handling in streaming mode",
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        {
          "category": "other",
          "text": "A flaw was found in the Python tarfile module. When processing a tar archive in streaming mode (mode=\u0027r|\u0027), the _Stream.seek function does not properly check for end-of-file, which can cause an infinite loop when processing a specially crafted archive. Red Hat ships Python as part of many products, and applications using tarfile\u0027s streaming mode are potentially affected by this denial of service vulnerability.",
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            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
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            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
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            "version": "3.1"
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            "Red Hat Hardened Images:python3-12-main@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "python: Python tarfile module: Denial of Service via improper EOF handling in streaming mode"
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  ]
}

CVE-2026-11972 (GCVE-0-2026-11972)

Vulnerability from cvelistv5 – Published: 2026-06-23 22:02 – Updated: 2026-08-13 00:28

Title

tarfile opened in streaming mode mishandles EOF

Summary

When using the "tarfile" module with a file opened in "streaming mode" (mode="r|") the tarfile module did not properly handle EOF, making archive parsing take exponentially longer.

Severity

8.2 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-24 15:33 UTC

CWE

Assigner

PSF mitre root

References

10 references

URL	Tags
https://github.com/python/cpython/issues/151981	issue-tracking
https://github.com/python/cpython/pull/151982	patch
https://mail.python.org/archives/list/security-an…	vendor-advisory
https://github.com/python/cpython/commit/3f031d43…	patch
https://github.com/python/cpython/commit/4ce6bf7c…	patch
https://github.com/python/cpython/commit/7f0dc59c…	patch
https://github.com/python/cpython/commit/e86666c9…	patch
https://github.com/python/cpython/commit/eb63c0f9…	patch
https://github.com/python/cpython/commit/f50bf135…	patch
https://github.com/python/cpython/commit/f5e2776f…	patch

Impacted products

1 product

Vendor	Product	Version
Python Software Foundation	CPython	Affected: 0 , < 3.10.21 (python) Affected: 3.11.0 , < 3.11.16 (python) Affected: 3.12.0 , < 3.12.14 (python) Affected: 3.13.0 , < 3.13.15 (python) Affected: 3.14.0 , < 3.14.7 (python) Affected: 3.15.0a1 , < 3.15.0b4 (python)

Credits

Ryan Hileman (https://github.com/lunixbochs) Petr Viktorin (https://github.com/encukou) Stan Ulbrych (https://github.com/StanFromIreland)

Show details on NVD website

JSON

To clipboard

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        {
          "tags": [
            "issue-tracking"
          ],
          "url": "https://github.com/python/cpython/issues/151981"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/python/cpython/pull/151982"
        },
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/AXPSKKTSRKXTTJULW3XSIC74WZNAAPPB/"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/python/cpython/commit/3f031d431f80668e14f3bc066bbf4369cd9281b9"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/python/cpython/commit/4ce6bf7c8aa7725828a38981c306f214c1f29365"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/python/cpython/commit/7f0dc59c9a70f8f3b4da33d7c4a2ba552a7acc21"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/python/cpython/commit/e86666c9dd256d52d0fbef6feb1ea4a51768fdec"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/python/cpython/commit/eb63c0f94dfcbea7fda8eab6213818e134d67192"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/python/cpython/commit/f50bf13566189c8d0ce5a814f33eff3d89951896"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/python/cpython/commit/f5e2776ff0383a902c12acf2b703e7e951fc8438"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "tarfile opened in streaming mode mishandles EOF",
      "x_generator": {
        "engine": "cvelib 1.8.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "28c92f92-d60d-412d-b760-e73465c3df22",
    "assignerShortName": "PSF",
    "cveId": "CVE-2026-11972",
    "datePublished": "2026-06-23T22:02:45.434Z",
    "dateReserved": "2026-06-11T11:35:05.520Z",
    "dateUpdated": "2026-08-13T00:28:46.899Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
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.

Detection rules are retrieved from Rulezet.

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.