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THREAT OPS › Threat News › [NVD] CVE-2026-86250 (HIGH 7.5) — 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 tha

[NVD] CVE-2026-86250 (HIGH 7.5) — 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 tha

mednvdPublished 2026-09-06

CVE-2026-86250 CVSS: 7.5 HIGH Published: 2026-09-06T12:17:15.767

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.

Indicators of compromise

CVE-2026-86250cve

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-86250