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CVE PROGRAM SOURCE RECORD8.7 High

CVE-2026-86250

h3 before 2.0.1-rc.18 Denial of Service via Unbounded Chunked Cookie

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Status
Published
Published
Updated
Assigning organization
VulnCheck

Description

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 products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

h3js h3

Default version status: unaffected

  • 2.0.0-beta.4 to < 2.0.1-rc.18affected
  • 2.0.1-rc.18unaffected
pkg:npm/h3

References