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Threatist priority CRITICAL 0 HIGH 0 MEDIUM 2 LOW 0

Signals Exploited in the wild (KEV) 0 Patch available 2 No fix listed 0 Has CVE 2

Fix status Fixed 1 Partial 1 Will not fix 0 Deferred 0 No fix listed 0

Impact type Code execution 0 Privilege escalation 0 Security bypass 0 Information disclosure 0 Tampering 0 Denial of service 1 Spoofing 1 Cross-site scripting 0 SQL injection 0

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Requirements No authentication 2 No user interaction 1

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Weakness (CWE) CWE-400 Uncontrolled Resource Consumption 1 CWE-601 URL Redirection to Untrusted Site 1

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Release: h3js h3 2.0.1-rc.18 × Clear all filters

TI-2026-59036 CVE-2026-86250 · GHSA-q5pr-72pq-83v3

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

Priority MEDIUM 44

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.

CVSS 4.0HIGH 8.7· Network · No auth · No interaction · EPSS 0.00488 · Published 2026-09-06 · Fixed in 2.0.1-rc.18 CWE-400

TI-2026-58994 CVE-2026-86205 · GHSA-vhx4-2r84-67h4

h3 before 2.0.1-rc.18 Open Redirect via redirectBack()

Priority MEDIUM 57

h3 versions before 2.0.1-rc.18 contain an open redirect vulnerability in the redirectBack() utility that fails to sanitize protocol-relative paths in the Referer header pathname.

CVSS 4.0MEDIUM 5.3· Network · No auth · User interaction · EPSS 0.00271 · Published 2026-09-06 · Partial fix · 2.0.1-rc.18 CWE-601

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