Vulnerability-Lookup

SUSE-SU-2026:3241-1

Vulnerability from csaf_suse - Published: 2026-07-24 13:06 - Updated: 2026-09-17 16:35

Summary

Security update for gzip

Severity

Important

Notes

Title of the patch: Security update for gzip

Description of the patch: This update for gzip fixes the following issue: - CVE-2026-41991: insecure temporary file handling in the gzexe utility when the mktemp utility is not available in the user's PATH (bsc#1269622).

Patchnames: SUSE-2026-3241,SUSE-SLE-SERVER-12-SP5-LTSS-2026-3241,SUSE-SLE-SERVER-12-SP5-LTSS-EXTENDED-SECURITY-2026-3241

CVE-2026-41991

7.1 (High)


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

Affected products

Recommended 17 products

Product	Version	Remediation
Unresolved product id: SUSE Linux Enterprise High Performance Computing 12 SP5:gzip-0:1.10-4.17.1.aarch64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise High Performance Computing 12 SP5:gzip-0:1.10-4.17.1.ppc64le	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise High Performance Computing 12 SP5:gzip-0:1.10-4.17.1.s390x	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise High Performance Computing 12 SP5:gzip-0:1.10-4.17.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 12 SP5-LTSS:gzip-0:1.10-4.17.1.aarch64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 12 SP5-LTSS:gzip-0:1.10-4.17.1.ppc64le	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 12 SP5-LTSS:gzip-0:1.10-4.17.1.s390x	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 12 SP5-LTSS:gzip-0:1.10-4.17.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 12 SP5:gzip-0:1.10-4.17.1.aarch64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 12 SP5:gzip-0:1.10-4.17.1.ppc64le	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 12 SP5:gzip-0:1.10-4.17.1.s390x	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server 12 SP5:gzip-0:1.10-4.17.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server LTSS Extended Security 12 SP5:gzip-0:1.10-4.17.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 12 SP5:gzip-0:1.10-4.17.1.aarch64	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 12 SP5:gzip-0:1.10-4.17.1.ppc64le	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 12 SP5:gzip-0:1.10-4.17.1.s390x	—	Vendor Fix
Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 12 SP5:gzip-0:1.10-4.17.1.x86_64	—	Vendor Fix

Threats

Impact important

References

9 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/s…	self
https://www.suse.com/support/update/announcement/…	self
https://lists.suse.com/pipermail/sle-security-upd…	self
https://bugzilla.suse.com/1269622	self
https://www.suse.com/security/cve/CVE-2026-41991/	self
https://www.suse.com/security/cve/CVE-2026-41991	external
https://bugzilla.suse.com/1269622	external
https://bugzilla.suse.com/1269623	external

JSON

To clipboard

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  "vulnerabilities": [
    {
      "cve": "CVE-2026-41991",
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        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2026-41991"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "GNU gzip contains a vulnerability in the gzexe utility related to insecure temporary file handling. When the mktemp utility is not available in the user\u0027s PATH, gzexe falls back to constructing a temporary file path based solely on the process ID (PID). This predictable filename is created without exclusive access or existence checks.\nA local attacker can pre-create the predicted temporary file path as a symbolic link pointing to an arbitrary file writable by the victim. When gzexe runs, it follows the symlink and overwrites the target file, resulting in a time-of-check to time-of-use (TOCTOU) condition that allows arbitrary file overwrite.\n\nThis issue has been fixed in the commit 4e6f8b24ab823146ab8776f0b7fe486ab34d4269",
          "title": "CVE description"
        }
      ],
      "product_status": {
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          "SUSE Linux Enterprise High Performance Computing 12 SP5:gzip-0:1.10-4.17.1.ppc64le",
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          "SUSE Linux Enterprise Server 12 SP5:gzip-0:1.10-4.17.1.x86_64",
          "SUSE Linux Enterprise Server LTSS Extended Security 12 SP5:gzip-0:1.10-4.17.1.x86_64",
          "SUSE Linux Enterprise Server for SAP Applications 12 SP5:gzip-0:1.10-4.17.1.aarch64",
          "SUSE Linux Enterprise Server for SAP Applications 12 SP5:gzip-0:1.10-4.17.1.ppc64le",
          "SUSE Linux Enterprise Server for SAP Applications 12 SP5:gzip-0:1.10-4.17.1.s390x",
          "SUSE Linux Enterprise Server for SAP Applications 12 SP5:gzip-0:1.10-4.17.1.x86_64"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "CVE-2026-41991",
          "url": "https://www.suse.com/security/cve/CVE-2026-41991"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1269622 for CVE-2026-41991",
          "url": "https://bugzilla.suse.com/1269622"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1269623 for CVE-2026-41991",
          "url": "https://bugzilla.suse.com/1269623"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
          "product_ids": [
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          ]
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      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H",
            "version": "3.1"
          },
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            "SUSE Linux Enterprise Server for SAP Applications 12 SP5:gzip-0:1.10-4.17.1.aarch64",
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            "SUSE Linux Enterprise Server for SAP Applications 12 SP5:gzip-0:1.10-4.17.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-07-24T13:06:52Z",
          "details": "important"
        }
      ],
      "title": "CVE-2026-41991"
    }
  ]
}

CVE-2026-41991 (GCVE-0-2026-41991)

Vulnerability from cvelistv5 – Published: 2026-06-29 10:15 – Updated: 2026-06-29 13:31 X_Open Source

Title

Predictable Temporary File in GNU gzip

Summary

GNU gzip contains a vulnerability in the gzexe utility related to insecure temporary file handling. When the mktemp utility is not available in the user’s PATH, gzexe falls back to constructing a temporary file path based solely on the process ID (PID). This predictable filename is created without exclusive access or existence checks. A local attacker can pre‑create the predicted temporary file path as a symbolic link pointing to an arbitrary file writable by the victim. When gzexe runs, it follows the symlink and overwrites the target file, resulting in a time‑of‑check to time‑of‑use (TOCTOU) condition that allows arbitrary file overwrite. This issue has been fixed in the commit 4e6f8b24ab823146ab8776f0b7fe486ab34d4269

Severity

2 (Low)


                        
                          CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:P/VC:N/VI:L/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 2026-06-29 13:31 UTC

CWE

CWE-377 - Insecure Temporary File

Assigner

CERT-PL ENISA root

References

3 references

URL	Tags
https://cert.pl/en/posts/2026/04/CVE-2026-41991/	third-party-advisory
https://www.gnu.org/software/gzip/	product
https://cgit.git.savannah.gnu.org/cgit/gzip.git/c…	patch

Impacted products

1 product

Vendor	Product	Version
GNU	gzip	Affected: 0 , ≤ 1.14 (semver)

Credits

Michał Majchrowicz (AFINE) Marcin Wyczechowski (AFINE)

Show details on NVD website

JSON

To clipboard

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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.