Medium 5.9Published Oct 20, 2025

CVE-2025-11679Out-of-bounds Read in libwebsockets PNG parsing

Updated under an hour ago (Oct 27, 2026, 6:00 AM ET)

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It affects warmcat libwebsockets. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for warmcat libwebsockets

Exploited in the last 30 days

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.

CVSS: 5.9 MEDIUM (v4.0, CNA)CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Weakness (CWE): CWE-125
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Nozomi
NVD analysis: Deferred
Record last updated: Oct 20, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

warmcat libwebsockets warmcat:libwebsockets (from the name)	from 4.0 through 4.4.2; from 4.0 through 4.3.6	CNA record

References

References

https://libwebsockets.org/git/libwebsockets/commit?id=7df24cca7144d7bc9233b6b0a71108bd154ce101	patch, vendor-advisory
https://www.nozominetworks.com/labs/vulnerability-advisories-cve-2025-11679	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.