VulnTideExploited vulnerabilities, by vendor. Data as of .
Not in CISA KEVPublished CVSS 7.8 highEPSS 0.3% probability of exploitation in 30 daysFound by AI: AISLE
Red Hat

CVE-2026-86320: Flatpak-builder: host code execution via `git am` hook execution in patch source extraction (`use-git-am`)

Is it exploited?

Not on CISA's list. CISA has not added it to the Known Exploited Vulnerabilities catalog as of . If CISA adds it, this page shows it as known exploited.

How likely is exploitation in the next 30 days?
0.3%

Up from 0.2% on .

EPSS score, percentile 21.3 of all scored records. A probability estimated by FIRST, not a report of exploitation.

CISA's SSVC assessment in the CVE record lists exploitation as poc.

How severe?
7.8 High

CVSS v3.1 base score, given by the CNA

What should I do?

CISA has set no required action, because the vulnerability is not in KEV.

Advisories and patches (9)

Which versions are affected?

Unaffected 0:1.4.4-1.el10_2.1; 0:1.4.4-1.el10_0.1; 0:1.2.3-2.el8_10; 0:1.0.9-4.el8_6; 0:1.0.9-4.el8_6; 0:1.0.14-3.el8_8; and 5 more

Versions by product

Source: CISA KEV 2026.10.29, as of ; FIRST EPSS, as of ; CVE List, as of . About the data.

What to do

Workaround (from the CVE record)

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.

Advisories and patches

This summary is based on the CVE record as of . Check the vendor's advisory before you act: affected versions and fixes can change.

Affected products and versions

As listed in the CVE record.

Red Hat Red Hat Enterprise Linux 10
StatusVersions
Unaffected0:1.4.4-1.el10_2.1

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support
StatusVersions
Unaffected0:1.4.4-1.el10_0.1

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 8
StatusVersions
Unaffected0:1.2.3-2.el8_10

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
StatusVersions
Unaffected0:1.0.9-4.el8_6

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
StatusVersions
Unaffected0:1.0.9-4.el8_6

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service
StatusVersions
Unaffected0:1.0.14-3.el8_8

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
StatusVersions
Unaffected0:1.0.14-3.el8_8

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 9
StatusVersions
Unaffected0:1.2.3-1.el9_8.1

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
StatusVersions
Unaffected0:1.2.2-2.el9_2

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
StatusVersions
Unaffected0:1.2.3-2.el9_4

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support
StatusVersions
Unaffected0:1.2.3-1.el9_6.1

Versions not listed are: affected.

Versions the record lists as unaffected: 0:1.4.4-1.el10_2.1, 0:1.4.4-1.el10_0.1, 0:1.2.3-2.el8_10, 0:1.0.9-4.el8_6, 0:1.0.14-3.el8_8, 0:1.2.3-1.el9_8.1, 0:1.2.2-2.el9_2, 0:1.2.3-2.el9_4.

Source: CVE List, as of . About the data.

About this vulnerability

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.

Summary: CVE record, as of .

  • CISA has not added CVE-2026-86320 to its Known Exploited Vulnerabilities (KEV) catalog, as of 29 Oct 2026.
  • The CVE record was published on 17 Sep 2026.
  • The CVE record carries a CVSS v3.1 base score of 7.8 (High), given by its CNA.
  • FIRST's EPSS model puts the probability of exploitation in the next 30 days at 0.3% (percentile 21.3), as of 29 Oct 2026. EPSS is a statistical estimate, not a report of exploitation.
  • CISA's SSVC assessment in the CVE record: exploitation poc, automatable no, technical impact total.
  • The credits in the CVE record name AISLE as finder.

Source: CISA KEV 2026.10.29, as of ; CVE List, as of ; FIRST EPSS, as of . About the data.

Description

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

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.

Source: CVE List, as of . About the data.

Weakness

CWE-94

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record.

Timeline

DateEvent
CVE record published
CVE record last updated

References

3

Known exploited Red Hat vulnerabilities

  • CVE-2015-3246: Red Hat Libuser Race Condition Vulnerability (added )
  • CVE-2015-5287: Red Hat Automatic Bug Reporting Tool Privilege Escalation Vulnerability (added )
  • CVE-2018-14667: Red Hat JBoss RichFaces Framework Expression Language Injection Vulnerability (added )
  • CVE-2021-3560: Red Hat Polkit Incorrect Authorization Vulnerability (added )
  • CVE-2021-4034: Red Hat Polkit Out-of-Bounds Read and Write Vulnerability (added )