CVE-2026-3854

Published Mar 10, 2026

Last updated 6 months ago

CVSS high 8.7

Cloud

Overview

Description: 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.
Source: product-cna@github.com
NVD status: Modified
Products: enterprise_server

Risk scores

CVSS 4.0

Type: Secondary
Base score: 8.7
Impact score: -
Exploitability score: -
Vector string: 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
Severity: HIGH

CVSS 3.1

Type: Primary
Base score: 8.8
Impact score: 5.9
Exploitability score: 2.8
Vector string: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Severity: HIGH

Weaknesses

product-cna@github.com: CWE-77

Hype score: Not currently trending

Configurations

[
  {
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*",
            "matchCriteriaId": "EB7E4D72-FF86-46B4-B083-AF569D3C3113",
            "versionEndExcluding": "3.14.24",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*",
            "matchCriteriaId": "F454B367-74E1-49D4-A8C0-BCE14CF453E5",
            "versionEndExcluding": "3.15.19",
            "versionStartIncluding": "3.15.0",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*",
            "matchCriteriaId": "AC07747C-95D1-4438-BBD8-9BC3C8F6B5F6",
            "versionEndExcluding": "3.16.15",
            "versionStartIncluding": "3.16.0",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*",
            "matchCriteriaId": "71BDBBDA-966C-419F-8D4F-5E7FB2411AE8",
            "versionEndExcluding": "3.17.12",
            "versionStartIncluding": "3.17.0",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*",
            "matchCriteriaId": "32CB5071-12A8-4C9A-9572-4FBC5C20F869",
            "versionEndExcluding": "3.18.6",
            "versionStartIncluding": "3.18.0",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*",
            "matchCriteriaId": "F7BDDDA3-FE7D-45F6-842C-0D023D926E18",
            "versionEndExcluding": "3.19.3",
            "versionStartIncluding": "3.19.0",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ]
  }
]

References

Sources include official advisories and independent security research.

Overview

Risk scores

CVSS 4.0

CVSS 3.1

Weaknesses

Social media

Configurations

Related CVEs

References