CVE-2026-86250
8.7
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Summary
h3 versions before 2.0.1-rc.18 fail to validate the chunk count parsed from user-controlled cookie values in setChunkedCookie() and deleteChunkedCookie() functions. Attackers can send a crafted cookie header with an extremely large chunk count to trigger an O(n²) cleanup loop that hangs the server process.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| h3js | h3 | 2.0.0-beta.4 < 2.0.1-rc.18 | affected |
| h3js | h3 | 2.0.1-rc.18 | unaffected |
Weaknesses
- CWE-400: Uncontrolled Resource Consumption
References
- https://github.com/h3js/h3/security/advisories/GHSA-q5pr-72pq-83v3
- https://www.vulncheck.com/advisories/h3-before-2.0.1-rc.18-denial-of-service-via-unbounded-chunked-cookie
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