CVE-2026-3854 in the critical feed json
Remote code execution via git push option injection in GitHub Enterprise Server
published 7mo ago modified 4mo ago also EUVD-2026-10744
- cvss
- 8.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 41.9%
- EPSS 41.9% chance of exploitation in 30 days, percentile 98%
- public exploits
- 0
- none known
Summary
An improper neutralization of special elements vulnerability was identified in GitHub Enterprise Server that allowed an attacker with push access to a repository to achieve remote code execution on the instance. During a git push operation, user-supplied push option values were not properly sanitized before being included in internal service headers. Because the internal header format used a delimiter character that could also appear in user input, an attacker could inject additional metadata fields through crafted push option values. This vulnerability was reported via the GitHub Bug Bounty program and has been fixed in GitHub Enterprise Server versions 3.14.25, 3.15.20, 3.16.16, 3.17.13, 3.18.7 and 3.19.4.
Patch / fix
- GitHub Enterprise Server 3.14.25, 3.15.20, 3.16.16, 3.17.13, 3.18.7, 3.19.4
Is CVE-2026-3854 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 6mo ago
Exploit prediction
41.94% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 8.7 | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N |
| CNA | 4.0 | 8.7 | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| NVD | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Affected products
- GitHub Enterprise Server
Classification
- Weakness
-
- CWE-77 Improper Neutralization of Special Elements used in a Command
References
- docs.github.com /en/enterprise-server@3.14/admin/release-notes#3.14.25
- docs.github.com /en/enterprise-server@3.15/admin/release-notes#3.15.20
- docs.github.com /en/enterprise-server@3.16/admin/release-notes#3.16.16
- docs.github.com /en/enterprise-server@3.17/admin/release-notes#3.17.13
- docs.github.com /en/enterprise-server@3.18/admin/release-notes#3.18.7
- docs.github.com /en/enterprise-server@3.19/admin/release-notes#3.19.4
-
wiz.io
/blog/github-rce-vulnerability-cve-2026-3854
technical-description
Sources
- CVE List CVE-2026-3854
- NVD CVE-2026-3854
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.