RCE in Red Hat Enterprise Linux 10
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.
Vulnerability class: RCE (Remote Code Execution)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.003 (22.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 22.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2026-86320 (vdb-entry)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking)
- github.com/flatpak/flatpak-builder/security/advisories/GHSA-j5p8-jgjc-f3xv
- access.redhat.com/errata/RHSA-2026:80495 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:80496 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:80973 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:84834 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:84832 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:84833 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:84842 (vendor-advisory)
Frequently asked questions
- What is CVE-2026-86320?
- CVE-2026-86320 is a high-severity vulnerability in Red Hat Enterprise Linux 10, classified under Code Injection. CVSS score: 7.8/10. Published 2026-09-17.
- How severe is CVE-2026-86320?
- High severity. CVSS v3 base score is 7.8 out of 10.