thoralox

QuicFall

Last verified 2h ago

nginx HTTP/3 QPACK use-after-free

Exploited in the wild?
YES · Active in KEV
Public exploit?
YES · 1 PoCs
Patch available?
No patch
Severity
8.2 HIGH
Check if you're affected Jump to fix commands

Risk signals

Known exploited
CISA KEV2026-10-25
Added Oct 25, 2026
38.7%
EPSS probability
95.1th percentile
PoC repos
1
CVSS
8.2

Summary

Crafted QPACK dynamic table updates free a header block still referenced by the stream.

Fix it

Per-distro commands are being verified
Our team is confirming fixed package versions for Nginx. Use your distribution's security tracker in the meantime.

Related incidents

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CVE-2019-11043
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CVE-2019-11043

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CISA KEVPatch available