PT-2026-86519 · Pypi · H3
CVSS v4.0
8.7
High
| Vector | AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
Name of the Vulnerable Software and Affected Versions
h3 versions prior to 2.0.1-rc.18
Description
The software fails to validate the chunk count parsed from user-controlled cookie values within the
setChunkedCookie() and deleteChunkedCookie() functions. An attacker can send a crafted cookie header containing an extremely large chunk count to trigger an O(n²) cleanup loop, which results in the server process hanging.Recommendations
Update h3 to version 2.0.1-rc.18 or later.
Exploit
Fix
DoS
Resource Exhaustion
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Weakness Enumeration
Related Identifiers
Affected Products
H3