Vulnerability-Lookup

ALSA-2026:80496

Vulnerability from osv_almalinux – Published: 2026-10-12 00:00 – Updated: 2026-10-14 09:02 – Source website

Summary

Important: flatpak-builder security update

Details

Flatpak-builder is a tool for building flatpaks from sources.

Security Fix(es):

flatpak-builder: Host code execution via git am hook execution in patch source extraction (use-git-am) (CVE-2026-86320)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

References

URL

Type

	https://access.redhat.com/errata/RHSA-2026:80496	ADVISORY
	https://access.redhat.com/security/cve/CVE-2026-86320	REPORT
	https://bugzilla.redhat.com/2471023	REPORT
	https://errata.almalinux.org/9/ALSA-2026-80496.html	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "AlmaLinux:9",
        "name": "flatpak-builder"
      },
      "ranges": [
        {
          "events": [
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            }
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          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "Flatpak-builder is a tool for building flatpaks from sources.  \n\nSecurity Fix(es):  \n\n  * flatpak-builder: Host code execution via `git am` hook execution in patch source extraction (`use-git-am`) (CVE-2026-86320)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n",
  "id": "ALSA-2026:80496",
  "modified": "2026-10-14T09:02:11Z",
  "published": "2026-10-12T00:00:00Z",
  "references": [
    {
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    },
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      "url": "https://access.redhat.com/security/cve/CVE-2026-86320"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2471023"
    },
    {
      "type": "ADVISORY",
      "url": "https://errata.almalinux.org/9/ALSA-2026-80496.html"
    }
  ],
  "related": [
    "CVE-2026-86320"
  ],
  "summary": "Important: flatpak-builder security update"
}

CVE-2026-86320 (GCVE-0-2026-86320)

Vulnerability from cvelistv5 – Published: 2026-09-17 07:27 – Updated: 2026-10-12 20:09

Title

Flatpak-builder: host code execution via `git am` hook execution in patch source extraction (`use-git-am`)

Summary

A flaw was found in flatpak-builder where Git hooks are not disabled when applying patch sources with use-git-am: true. An attacker who can provide a malicious source containing a Git post-applypatch hook can cause the hook to execute on the host during the build process, resulting in arbitrary code execution with the privileges of the user running flatpak-builder.

Severity

7.8 (High)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-17 15:42 UTC

CWE

CWE-94 - Improper Control of Generation of Code ('Code Injection')

Assigner

redhat CNA under the redhat root

CNA scorecard B 81/100 over 1018 records in the last 180 days details

References

6 references

URL	Tags
https://access.redhat.com/errata/RHSA-2026:80495	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:80496	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:80973	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-86320	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2471023	issue-trackingx_refsource_REDHAT
https://github.com/flatpak/flatpak-builder/securi…

Impacted products

3 products

Vendor	Product	Version
Red Hat	Red Hat Enterprise Linux 10	Unaffected: 0:1.4.4-1.el10_2.1 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.2
Red Hat	Red Hat Enterprise Linux 8	Unaffected: 0:1.2.3-2.el8_10 , < * (rpm) cpe:/a:redhat:enterprise_linux:8::appstream
Red Hat	Red Hat Enterprise Linux 9	Unaffected: 0:1.2.3-1.el9_8.1 , < * (rpm) cpe:/a:redhat:enterprise_linux:9::appstream

Date Public

2026-08-13 14:32

Credits

Red Hat would like to thank AISLE Research for reporting this issue.

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.

Vulnerability timeline

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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.
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