Vulnerability-Lookup

RHSA-2026:67606

Vulnerability from csaf_redhat - Published: 2026-09-15 14:42 - Updated: 2026-09-21 11:42

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: python3.13: * python3.13-3.13.15-1.2.hum1 (aarch64, x86_64) * python3.13-debug-3.13.15-1.2.hum1 (aarch64, x86_64) * python3.13-devel-3.13.15-1.2.hum1 (aarch64, x86_64) * python3.13-freethreading-3.13.15-1.2.hum1 (aarch64, x86_64) * python3.13-freethreading-debug-3.13.15-1.2.hum1 (aarch64, x86_64) * python3.13-idle-3.13.15-1.2.hum1 (aarch64, x86_64) * python3.13-libs-3.13.15-1.2.hum1 (aarch64, x86_64) * python3.13-test-3.13.15-1.2.hum1 (aarch64, x86_64) * python3.13-tkinter-3.13.15-1.2.hum1 (aarch64, x86_64) * python3.13-3.13.15-1.2.hum1.src (src) Security Fix(es): python3.13: * CVE-2026-87910

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-2026-87910

A flaw was found in the Python `tarfile` module. When extracting an archive containing a link on systems that do not support links, the module falls back to extracting the linked member. During this fallback, a security filter designed to prevent the extraction of certain files is not properly applied. This oversight could allow an attacker to bypass intended security restrictions, potentially leading to the creation or modification of arbitrary files on the system.

5.7 (Medium)


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

CWE-252 - Unchecked Return Value

Affected products

Fixed 19 products

Product	Version	Remediation
Unresolved product id: Red Hat Hardened Images:python3.13-0:3.13.15-1.2.hum1@aarch64	—	Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:python3.13-0:3.13.15-1.2.hum1@src	—	Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:python3.13-0:3.13.15-1.2.hum1@x86_64	—	Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:python3.13-debug-0:3.13.15-1.2.hum1@aarch64	—	Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:python3.13-debug-0:3.13.15-1.2.hum1@x86_64	—	Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:python3.13-devel-0:3.13.15-1.2.hum1@aarch64	—	Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:python3.13-devel-0:3.13.15-1.2.hum1@x86_64	—	Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:python3.13-freethreading-0:3.13.15-1.2.hum1@aarch64	—	Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:python3.13-freethreading-0:3.13.15-1.2.hum1@x86_64	—	Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:python3.13-freethreading-debug-0:3.13.15-1.2.hum1@aarch64	—	Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:python3.13-freethreading-debug-0:3.13.15-1.2.hum1@x86_64	—	Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:python3.13-idle-0:3.13.15-1.2.hum1@aarch64	—	Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:python3.13-idle-0:3.13.15-1.2.hum1@x86_64	—	Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:python3.13-libs-0:3.13.15-1.2.hum1@aarch64	—	Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:python3.13-libs-0:3.13.15-1.2.hum1@x86_64	—	Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:python3.13-test-0:3.13.15-1.2.hum1@aarch64	—	Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:python3.13-test-0:3.13.15-1.2.hum1@x86_64	—	Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:python3.13-tkinter-0:3.13.15-1.2.hum1@aarch64	—	Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:python3.13-tkinter-0:3.13.15-1.2.hum1@x86_64	—	Vendor Fix fix

Threats

Impact Moderate

References

12 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:67606	self
https://access.redhat.com/security/cve/CVE-2026-87910	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-2026-87910	self
https://bugzilla.redhat.com/show_bug.cgi?id=2531985	external
https://www.cve.org/CVERecord?id=CVE-2026-87910	external
https://nvd.nist.gov/vuln/detail/CVE-2026-87910	external
https://github.com/python/cpython/issues/157265	external
https://github.com/python/cpython/pull/157266	external
https://mail.python.org/archives/list/security-an…	external

JSON

To clipboard

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          "category": "impact",
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      "title": "python: Python tarfile module: Security filter bypass allows arbitrary file write"
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}

CVE-2026-87910 (GCVE-0-2026-87910)

Vulnerability from cvelistv5 – Published: 2026-09-11 17:27 – Updated: 2026-09-22 00:32

Title

tarfile hardlink fallback ignores custom extraction filter rejection via None

Summary

When tarfile extracts a link on a system that doesn't support links, it falls back to extracting a member from the archive. In this case, the filter function is run twice: once for the extracted member, and once with name set to the location of the link. For one of the calls, the return value was ignored. Instead, the member should be skipped if either call returns None.

Severity

5.7 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-11 19:23 UTC

CWE

Assigner

PSF mitre root

References

7 references

URL	Tags
https://mail.python.org/archives/list/security-an…	vendor-advisory
https://github.com/python/cpython/pull/157266	patch
https://github.com/python/cpython/issues/157265	issue-tracking
https://github.com/python/cpython/commit/d9565e54…	patch
https://github.com/python/cpython/commit/fb2f0bbc…	patch
https://github.com/python/cpython/commit/9c17bace…	patch
http://www.openwall.com/lists/oss-security/2026/09/11/8

Impacted products

1 product

Vendor	Product	Version
Python Software Foundation	CPython	Affected: 0 , < 3.15.0 (python)

Credits

William Woodruff (https://github.com/woodruffw) Zanie Blue (https://github.com/zanieb) Petr Viktorin (https://github.com/encukou) Stan Ulbrych (https://github.com/StanFromIreland)

Show details on NVD website

JSON

To clipboard

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          "lang": "en",
          "type": "remediation reviewer",
          "value": "Stan Ulbrych (https://github.com/StanFromIreland)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "type": "text/html",
              "value": "When tarfile extracts a link on a system that doesn\u0027t support links, it falls back to extracting a member from the archive. In this case, the filter function is run twice: once for the extracted member, and once with name set to the location of the link. For one of the calls, the return value was ignored. Instead, the member should be skipped if either call returns None."
            }
          ],
          "value": "When tarfile extracts a link on a system that doesn\u0027t support links, it falls back to extracting a member from the archive. In this case, the filter function is run twice: once for the extracted member, and once with name set to the location of the link. For one of the calls, the return value was ignored. Instead, the member should be skipped if either call returns None."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 5.7,
            "baseSeverity": "MEDIUM",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "LOW",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "ACTIVE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-22",
              "description": "CWE-22",
              "lang": "en",
              "type": "CWE"
            },
            {
              "cweId": "CWE-59",
              "description": "CWE-59",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-22T00:32:16.178Z",
        "orgId": "28c92f92-d60d-412d-b760-e73465c3df22",
        "shortName": "PSF"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/57TBTLL2W6APMZR3A25B2YV7GL3EPTDJ/"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/python/cpython/pull/157266"
        },
        {
          "tags": [
            "issue-tracking"
          ],
          "url": "https://github.com/python/cpython/issues/157265"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/python/cpython/commit/d9565e54b1fc6d63c5be9afd58114499128fa57b"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/python/cpython/commit/fb2f0bbc3b35264f09cc2cb2934b7987527a6bc2"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/python/cpython/commit/9c17bace90f88dfba6d0e2fe23c8e7ae35f83955"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "tarfile hardlink fallback ignores custom extraction filter rejection via None",
      "x_generator": {
        "engine": "cvelib 1.8.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "28c92f92-d60d-412d-b760-e73465c3df22",
    "assignerShortName": "PSF",
    "cveId": "CVE-2026-87910",
    "datePublished": "2026-09-11T17:27:04.339Z",
    "dateReserved": "2026-09-09T15:11:08.270Z",
    "dateUpdated": "2026-09-22T00:32:16.178Z",
    "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.

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

RHSA-2026:67606

CVE-2026-87910 (GCVE-0-2026-87910)

Tags

Sightings

Nomenclature

Related by attack behaviour