Vulnerability-Lookup

RHSA-2026:80495

Vulnerability from csaf_redhat - Published: 2026-10-12 02:10 - Updated: 2026-10-12 02:14

Summary

Red Hat Security Advisory: flatpak-builder security update

Severity

Important

Notes

Topic: An update for flatpak-builder is now available for Red Hat Enterprise Linux 10. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

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.

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-2026-86320

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.

7.8 (High)


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

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

Affected products

Fixed 13 products

Product	Version	Remediation
Unresolved product id: AppStream-10.2.Z:flatpak-builder-0:1.4.4-1.el10_2.1.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:flatpak-builder-0:1.4.4-1.el10_2.1.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:flatpak-builder-0:1.4.4-1.el10_2.1.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:flatpak-builder-0:1.4.4-1.el10_2.1.src	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:flatpak-builder-0:1.4.4-1.el10_2.1.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:flatpak-builder-debuginfo-0:1.4.4-1.el10_2.1.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:flatpak-builder-debuginfo-0:1.4.4-1.el10_2.1.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:flatpak-builder-debuginfo-0:1.4.4-1.el10_2.1.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:flatpak-builder-debuginfo-0:1.4.4-1.el10_2.1.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:flatpak-builder-debugsource-0:1.4.4-1.el10_2.1.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:flatpak-builder-debugsource-0:1.4.4-1.el10_2.1.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:flatpak-builder-debugsource-0:1.4.4-1.el10_2.1.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:flatpak-builder-debugsource-0:1.4.4-1.el10_2.1.x86_64	—	Vendor Fix fix Workaround

Threats

Impact Important

References

9 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:80495	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=2471023	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-86320	self
https://bugzilla.redhat.com/show_bug.cgi?id=2471023	external
https://www.cve.org/CVERecord?id=CVE-2026-86320	external
https://nvd.nist.gov/vuln/detail/CVE-2026-86320	external
https://github.com/flatpak/flatpak-builder/securi…	external

Acknowledgments

AISLE Research

JSON

To clipboard

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          "name": "flatpak-builder-debugsource-0:1.4.4-1.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10)",
          "product_id": "AppStream-10.2.Z:flatpak-builder-debugsource-0:1.4.4-1.el10_2.1.x86_64"
        },
        "product_reference": "flatpak-builder-debugsource-0:1.4.4-1.el10_2.1.x86_64",
        "relates_to_product_reference": "AppStream-10.2.Z"
      }
    ]
  },
  "vulnerabilities": [
    {
      "acknowledgments": [
        {
          "names": [
            "AISLE Research"
          ]
        }
      ],
      "cve": "CVE-2026-86320",
      "cwe": {
        "id": "CWE-94",
        "name": "Improper Control of Generation of Code (\u0027Code Injection\u0027)"
      },
      "discovery_date": "2026-05-11T20:27:44+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2471023"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "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.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "flatpak-builder: Host code execution via `git am` hook execution in patch source extraction (`use-git-am`)",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Red Hat Product Security has rated this flaw as having an Important security impact. The vulnerability allows a malicious source to execute arbitrary code on the host when processed by flatpak-builder with use-git-am: true. Exploitation requires the target build process to process an attacker-controlled or otherwise untrusted source using this option. In typical interactive builds, user interaction is required to initiate the build, while automated build services that process untrusted manifests may be exposed without additional user interaction. Successful exploitation provides code execution with the privileges of the flatpak-builder process and may allow access to or modification of data available to that process.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "fixed": [
          "AppStream-10.2.Z:flatpak-builder-0:1.4.4-1.el10_2.1.aarch64",
          "AppStream-10.2.Z:flatpak-builder-0:1.4.4-1.el10_2.1.ppc64le",
          "AppStream-10.2.Z:flatpak-builder-0:1.4.4-1.el10_2.1.s390x",
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          "AppStream-10.2.Z:flatpak-builder-debuginfo-0:1.4.4-1.el10_2.1.aarch64",
          "AppStream-10.2.Z:flatpak-builder-debuginfo-0:1.4.4-1.el10_2.1.ppc64le",
          "AppStream-10.2.Z:flatpak-builder-debuginfo-0:1.4.4-1.el10_2.1.s390x",
          "AppStream-10.2.Z:flatpak-builder-debuginfo-0:1.4.4-1.el10_2.1.x86_64",
          "AppStream-10.2.Z:flatpak-builder-debugsource-0:1.4.4-1.el10_2.1.aarch64",
          "AppStream-10.2.Z:flatpak-builder-debugsource-0:1.4.4-1.el10_2.1.ppc64le",
          "AppStream-10.2.Z:flatpak-builder-debugsource-0:1.4.4-1.el10_2.1.s390x",
          "AppStream-10.2.Z:flatpak-builder-debugsource-0:1.4.4-1.el10_2.1.x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-86320"
        },
        {
          "category": "external",
          "summary": "RHBZ#2471023",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2471023"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-86320",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-86320"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-86320",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-86320"
        },
        {
          "category": "external",
          "summary": "https://github.com/flatpak/flatpak-builder/security/advisories/GHSA-j5p8-jgjc-f3xv",
          "url": "https://github.com/flatpak/flatpak-builder/security/advisories/GHSA-j5p8-jgjc-f3xv"
        }
      ],
      "release_date": "2026-08-13T14:32:20.714217+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-10-12T02:10:37+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
          "product_ids": [
            "AppStream-10.2.Z:flatpak-builder-0:1.4.4-1.el10_2.1.aarch64",
            "AppStream-10.2.Z:flatpak-builder-0:1.4.4-1.el10_2.1.ppc64le",
            "AppStream-10.2.Z:flatpak-builder-0:1.4.4-1.el10_2.1.s390x",
            "AppStream-10.2.Z:flatpak-builder-0:1.4.4-1.el10_2.1.src",
            "AppStream-10.2.Z:flatpak-builder-0:1.4.4-1.el10_2.1.x86_64",
            "AppStream-10.2.Z:flatpak-builder-debuginfo-0:1.4.4-1.el10_2.1.aarch64",
            "AppStream-10.2.Z:flatpak-builder-debuginfo-0:1.4.4-1.el10_2.1.ppc64le",
            "AppStream-10.2.Z:flatpak-builder-debuginfo-0:1.4.4-1.el10_2.1.s390x",
            "AppStream-10.2.Z:flatpak-builder-debuginfo-0:1.4.4-1.el10_2.1.x86_64",
            "AppStream-10.2.Z:flatpak-builder-debugsource-0:1.4.4-1.el10_2.1.aarch64",
            "AppStream-10.2.Z:flatpak-builder-debugsource-0:1.4.4-1.el10_2.1.ppc64le",
            "AppStream-10.2.Z:flatpak-builder-debugsource-0:1.4.4-1.el10_2.1.s390x",
            "AppStream-10.2.Z:flatpak-builder-debugsource-0:1.4.4-1.el10_2.1.x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:80495"
        },
        {
          "category": "workaround",
          "details": "Avoid using use-git-am: true when processing untrusted manifests or source material. Where untrusted builds are required, perform builds inside disposable virtual machines or other isolated environments.",
          "product_ids": [
            "AppStream-10.2.Z:flatpak-builder-0:1.4.4-1.el10_2.1.aarch64",
            "AppStream-10.2.Z:flatpak-builder-0:1.4.4-1.el10_2.1.ppc64le",
            "AppStream-10.2.Z:flatpak-builder-0:1.4.4-1.el10_2.1.s390x",
            "AppStream-10.2.Z:flatpak-builder-0:1.4.4-1.el10_2.1.src",
            "AppStream-10.2.Z:flatpak-builder-0:1.4.4-1.el10_2.1.x86_64",
            "AppStream-10.2.Z:flatpak-builder-debuginfo-0:1.4.4-1.el10_2.1.aarch64",
            "AppStream-10.2.Z:flatpak-builder-debuginfo-0:1.4.4-1.el10_2.1.ppc64le",
            "AppStream-10.2.Z:flatpak-builder-debuginfo-0:1.4.4-1.el10_2.1.s390x",
            "AppStream-10.2.Z:flatpak-builder-debuginfo-0:1.4.4-1.el10_2.1.x86_64",
            "AppStream-10.2.Z:flatpak-builder-debugsource-0:1.4.4-1.el10_2.1.aarch64",
            "AppStream-10.2.Z:flatpak-builder-debugsource-0:1.4.4-1.el10_2.1.ppc64le",
            "AppStream-10.2.Z:flatpak-builder-debugsource-0:1.4.4-1.el10_2.1.s390x",
            "AppStream-10.2.Z:flatpak-builder-debugsource-0:1.4.4-1.el10_2.1.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "AppStream-10.2.Z:flatpak-builder-0:1.4.4-1.el10_2.1.aarch64",
            "AppStream-10.2.Z:flatpak-builder-0:1.4.4-1.el10_2.1.ppc64le",
            "AppStream-10.2.Z:flatpak-builder-0:1.4.4-1.el10_2.1.s390x",
            "AppStream-10.2.Z:flatpak-builder-0:1.4.4-1.el10_2.1.src",
            "AppStream-10.2.Z:flatpak-builder-0:1.4.4-1.el10_2.1.x86_64",
            "AppStream-10.2.Z:flatpak-builder-debuginfo-0:1.4.4-1.el10_2.1.aarch64",
            "AppStream-10.2.Z:flatpak-builder-debuginfo-0:1.4.4-1.el10_2.1.ppc64le",
            "AppStream-10.2.Z:flatpak-builder-debuginfo-0:1.4.4-1.el10_2.1.s390x",
            "AppStream-10.2.Z:flatpak-builder-debuginfo-0:1.4.4-1.el10_2.1.x86_64",
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            "AppStream-10.2.Z:flatpak-builder-debugsource-0:1.4.4-1.el10_2.1.s390x",
            "AppStream-10.2.Z:flatpak-builder-debugsource-0:1.4.4-1.el10_2.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "flatpak-builder: Host code execution via `git am` hook execution in patch source extraction (`use-git-am`)"
    }
  ]
}

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

Vulnerability from cvelistv5 – Published: 2026-09-17 07:27 – Updated: 2026-10-12 02:12

Title

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

Summary

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 977 records in the last 180 days details

References

5 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/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 9	Unaffected: 0:1.2.3-1.el9_8.1 , < * (rpm) cpe:/a:redhat:enterprise_linux:9::appstream
Red Hat	Red Hat Enterprise Linux 8	cpe:/o:redhat:enterprise_linux:8

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.

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-2026:80495

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

Tags

Sightings

Nomenclature

Related by attack behaviour