CVE-2026-3854 Details
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 3.14.24, 3.15.19, 3.16.15, 3.17.12, 3.18.6 and 3.19.3.
View at NVD
Exploit prediction scoring system (EPSS) score for CVE-2026-3854
EPSS (Exploit Prediction Scoring System): EPSS predicts the likelihood that a vulnerability will be exploited in the wild. A higher percentage means a greater chance of an exploit occurring. The EPSS model produces a probability score between 0 and 1 (0 and 100%).
0.35 Probability of exploitation activity being observed over the next 30 days (58th percentile)
CVSS score for CVE-2026-3854
CVSS (Common Vulnerability Scoring System): An open framework owned and managed by FIRST.Org, Inc. that assigns a numerical score from 0 to 10 to software vulnerabilities to indicate their severity.
8.8 High
Products affected by CVE-2026-3854
Enterprise Server 3.17.0
Enterprise Server 3.17.6
Enterprise Server 3.18.0
Enterprise Server 3.18.1
Enterprise Server 3.19.0
DVE Score by Bitsight AI
DVE scores complement traditional static scoring systems like CVSS with Bitsight AI powered real-time threat intelligence and underground cyber criminal activity so that security teams can reduce alert fatigue and focus on vulnerabilities most likely to be exploited.
Critical
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CVE-2026-3854 Global Footprint

Top 10 Identified Countries

Country Observations Percentage
US 38 55.88%
AU 6 8.82%
IE 5 7.35%
CA 4 5.88%
JP 4 5.88%
FR 2 2.94%
GB 2 2.94%
SE 2 2.94%
DK 1 1.47%
ID 1 1.47%

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CVE-2026-3854 Industry Footprint

Top 10 Identified Industries

*Service provider organizations (typically Technology and Telecommunications) are disproportionally represented in the results given their upstream ownership of end-user infrastructure. See our FAQs.

Industry* Observations Percentage
Technology 56 83.58%
Education 7 10.45%
Engineering 1 1.49%
Manufacturing 1 1.49%
Government/Politics 1 1.49%
Telecommunications 1 1.49%

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