CVE-2025-11678

Stack-based Buffer Overflowin lws_adns_parse_label in warmcat libwebsockets allows, when the LWS_WITH_SYS_ASYNC_DNS flag is enabled during compilation, to overflow the label_stack, when the attacker is able to sniff a DNS request in order to craft a response with a matching id containing a label longer than the maximum.
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: 9%
Debian logo
Debian Releases
Debian Product
Codename
libwebsockets
bullseye
vulnerable
bookworm
no-dsa
bullseye (security)
4.0.20-2+deb11u1
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=2bb9598562b37c942ba5b04bcde3f7fdf66a9d3a
https://www.nozominetworks.com/labs/vulnerability-advisories-cve-2025-11678