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VulnerabilityPublished Updated

CVE-2026-86320: Red Hat Enterprise Linux 10 · Code Injection

Affects Red Hat Enterprise Linux 10Source CVE Database V5

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Not known to be exploited · CVSS 7.8 High.

Data as of 1 Nov 2026, 11:17 UTC

CVSS 3.1 base score
7.8High
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (redhat)CVSS 3.17.8
EPSS
0.2% chance of exploitation in 30 days – higher than 22% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 17 Sep 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 1 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
Red Hat Enterprise Linux 10flatpak-builderAffected–Fixed in–
Red Hat Enterprise Linux 10.0 Extended Update Supportflatpak-builderAffected–Fixed in–
Red Hat Enterprise Linux 8flatpak-builderAffected–Fixed in–
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Supportflatpak-builderAffected–Fixed in–
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-Onflatpak-builderAffected–Fixed in–
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Supportflatpak-builderAffected–Fixed in–

AI-suggested

Avoid using the use-git-am: true option when processing untrusted manifests or source material. For builds involving untrusted sources, perform them inside disposable virtual machines or other isolated environments to contain potential exploitation. Red Hat has not indicated an official patch in the advisory; therefore, these mitigations are recommended until an official fix is available.

Description

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.

References

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