CVE-2026-7541 PUBLISHED

Denial of service vulnerability in GitHub Enterprise Server allowed service disruption via unauthenticated API endpoint

Assigner: GitHub_P
Reserved: 30.04.2026 Published: 07.05.2026 Updated: 07.05.2026

A denial of service vulnerability was identified in GitHub Enterprise Server that allowed an unauthenticated attacker to cause service disruption by sending crafted requests with deeply nested JSON payloads to an unauthenticated API endpoint. The endpoint parsed user-controlled JSON request bodies without size or depth limits, causing excessive CPU and memory consumption. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.20.2, 3.19.6, 3.18.9, 3.17.15, and 3.16.18. This vulnerability was reported via the GitHub Bug Bounty program.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:U
CVSS Score: 6.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	Present	Availability	High	Availability	High
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	GitHub
Product	Enterprise Server
Versions	Default: affected affected from 3.16.0 to 3.16.17 (incl.) affected from 3.17.0 to 3.17.14 (incl.) affected from 3.18.0 to 3.18.8 (incl.) affected from 3.19.0 to 3.19.5 (incl.) affected from 3.20.0 to 3.20.1 (incl.)

Credits

Nguyen Nhat Anh (GitHub: anh2025) finder

References

Problem Types

CWE-770 Allocation of resources without limits or throttling CWE

Impacts

CAPEC-229 Serialized Data Parameter Blowup