CVE-2025-11679

Out-of-bounds Read in lws_upng_emit_next_line in warmcat libwebsockets allows, when the LWS_WITH_UPNG flag is enabled during compilation and the HTML display stack is used, to read past a heap allocated buffer possibly causing a crash, when the user visits an attacker controlled website that contains a crafted PNG file with a big height dimension.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
UNKNOWN
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NozomiCNA
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CISA-ADPADP
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Awaiting analysis
This vulnerability is currently awaiting analysis.
Base Score
CVSS 3.x
EPSS Score
Percentile: 18%
Debian logo
Debian Releases
Debian Product
Codename
libwebsockets
bullseye
4.0.20-2
fixed
bullseye (security)
4.0.20-2+deb11u1
fixed
bookworm
4.1.6-3
fixed
trixie
4.3.5-1+deb13u1
fixed
forky
4.3.5-3
fixed
sid
4.3.5-3
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
libwebsockets
questing
needs-triage
plucky
needs-triage
noble
needs-triage
jammy
needs-triage
focal
needs-triage
bionic
needs-triage
xenial
needs-triage
Common Weakness Enumeration
References
https://libwebsockets.org/git/libwebsockets/commit?id=7df24cca7144d7bc9233b6b0a71108bd154ce101
https://www.nozominetworks.com/labs/vulnerability-advisories-cve-2025-11679