PT-2025-42763 · Unknown+1 · Libwebsockets+1

Published 2025-10-20 · Updated 2025-10-20 · CVE-2025-11680

Positive Technologies (AI Summary)

CVSS v4.0

5.9

Medium

Base vector

AV:N/AC:H/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Name of the Vulnerable Software and Affected Versions libwebsockets (affected versions not specified)

Description An out-of-bounds write issue exists in the unfilter scanline function of libwebsockets. This occurs when the LWS WITH UPNG flag is enabled during compilation and the HTML display stack is used. The issue is triggered by visiting a website containing a crafted PNG file with a large width value, leading to an integer overflow. This overflow affects the size calculation for a heap allocation, potentially causing a crash due to writing past a heap-allocated buffer.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Memory Corruption

Weakness Enumeration

CWE-787

Related Identifiers

CVE-2025-11680

Affected Products

Debian

Libwebsockets

References · 10

• https://security-tracker.debian.org/tracker/CVE-2025-11680 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2025-11680 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-11680 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2025-11680 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-11680 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2025-11680 · Security Note
• https://libwebsockets.org/git/libwebsockets/commit?id=2b715249f39291c86443b969a1088d59b6a89b78 · Patch, Vendor Advisory
• https://nozominetworks.com/labs/vulnerability-advisories-cve-2025-11680 · Note
• https://twitter.com/CVEnew/status/1980283330747867371 · Twitter Post
• https://t.me/cveNotify/139389 · Telegram Post