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Description

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.

PUBLISHED Reserved 2026-04-30 | Published 2026-05-07 | Updated 2026-05-08 | Assigner GitHub_P




MEDIUM: 6.3CVSS: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

Problem types

CWE-770 Allocation of resources without limits or throttling

Product status

Default status
affected

3.16.0 (semver)
affected

3.17.0 (semver)
affected

3.18.0 (semver)
affected

3.19.0 (semver)
affected

3.20.0 (semver)
affected

Credits

Nguyen Nhat Anh (GitHub: anh2025) finder

References

docs.github.com/...nterprise-server@3.16/admin/release-notes release-notes

docs.github.com/...nterprise-server@3.17/admin/release-notes release-notes

docs.github.com/...nterprise-server@3.18/admin/release-notes release-notes

docs.github.com/...nterprise-server@3.19/admin/release-notes release-notes

docs.github.com/...nterprise-server@3.20/admin/release-notes release-notes

cve.org (CVE-2026-7541)

nvd.nist.gov (CVE-2026-7541)

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