CVE-2026-86320Flatpak-builder: host code execution via `git am` hook execution in patch source extraction (`use-git-am`)
- 7.8HighCVSS base score
- 0.30%Exploitation in 30 daysEPSS · top 77% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- YesPublic exploitsa reference or SSVC says so
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.
Public exploit
An exploit or proof of concept is public: anyone can try it against an unpatched system. 2 references of the record are tagged as an exploit. CISA's SSVC rates its exploitation: a proof of concept is public.
Show the exploits2
References tagged exploit2 references
- RHBZ#2471023 (opens in a new tab)issue-trackingx_refsource_REDHATexploit
- https://github.com/flatpak/flatpak-builder/security/advisories/GHSA-j5p8-jgjc-f3xv (opens in a new tab)exploit
Timeline
ID reserved
By redhat
- 10 days later
· 10 days later
Published
- 55 days later
· 55 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| redhatCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| NVDNVD · Awaiting Analysis | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.30% · top 77% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: poc · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
Red Hat · Red Hat Enterprise Linux 10
- unaffected 0:1.4.4-1.el10_2.1 – < *
Red Hat · Red Hat Enterprise Linux 10
- unaffected 0:1.4.7-1.el10_3.1 – < *
Red Hat · Red Hat Enterprise Linux 10.0 Extended Update Support
- unaffected 0:1.4.4-1.el10_0.1 – < *
Red Hat · Red Hat Enterprise Linux 8
- unaffected 0:1.2.3-2.el8_10 – < *
Red Hat · Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
- unaffected 0:1.0.9-4.el8_4 – < *
Red Hat · Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
- unaffected 0:1.0.9-4.el8_4 – < *
Red Hat · Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
- unaffected 0:1.0.9-4.el8_6 – < *
Red Hat · Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
- unaffected 0:1.0.9-4.el8_6 – < *
Red Hat · Red Hat Enterprise Linux 8.8 Telecommunications Update Service
- unaffected 0:1.0.14-3.el8_8 – < *
Red Hat · Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
- unaffected 0:1.0.14-3.el8_8 – < *
Red Hat · Red Hat Enterprise Linux 9
- unaffected 0:1.2.3-1.el9_8.1 – < *
Red Hat · Red Hat Enterprise Linux 9
- unaffected 0:1.2.3-1.el9_9.1 – < *
Red Hat · Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
- unaffected 0:1.2.2-2.el9_2 – < *
Red Hat · Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
- unaffected 0:1.2.3-2.el9_4 – < *
Red Hat · Red Hat Enterprise Linux 9.6 Extended Update Support
- unaffected 0:1.2.3-1.el9_6.1 – < *
What to do
Workaround: 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.
References
References15
- RHSA-2026:80495 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:80496 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:80973 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:84832 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:84833 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:84834 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:84842 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:86714 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:90896 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:92220 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:98536 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:98642 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-86320 (opens in a new tab)vdb-entryx_refsource_REDHAT
- RHBZ#2471023 (opens in a new tab)issue-trackingx_refsource_REDHATexploit
- https://github.com/flatpak/flatpak-builder/security/advisories/GHSA-j5p8-jgjc-f3xv (opens in a new tab)exploit
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-81387 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-86320)Record last updated .