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Description

Out-of-bounds Write in unfilter_scanline in warmcat libwebsockets allows, when the LWS_WITH_UPNG flag is enabled during compilation and the HTML display stack is used, to write 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 width value that causes an integer overflow which value is used for determining the size of a heap allocation.

PUBLISHED Reserved 2025-10-13 | Published 2025-10-20 | Updated 2025-10-20 | Assigner Nozomi




MEDIUM: 5.9CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Problem types

CWE-787 Out-of-bounds Write

Product status

Default status
unaffected

4.0 (semver)
affected

4.0 (semver)
affected

Credits

Raffaele Bova at Nozomi Networks finder

References

libwebsockets.org/...b715249f39291c86443b969a1088d59b6a89b78 patch vendor-advisory

www.nozominetworks.com/...rability-advisories-cve-2025-11680 third-party-advisory

cve.org (CVE-2025-11680)

nvd.nist.gov (CVE-2025-11680)

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