PT-2025-42759 · Unknown+3 · Libwebsockets+3

Published 2025-10-20 · Updated 2026-02-11 · CVE-2025-11677

Positive Technologies (AI Summary)

CVSS v4.0

6.3

Medium

Base vector

AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

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

Description A use-after-free issue exists in the WebSocket server implementation within the lws handshake server function of libwebsockets. This can lead to a denial of service if an attacker exploits specific configurations where a user-provided callback function handles LWS CALLBACK HTTP CONFIRM UPGRADE.

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

DoS

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

CVE-2025-11677

DLA-4373-1

OESA-2025-2611

USN-8024-1

Affected Products

Debian

Linuxmint

Ubuntu

Libwebsockets

References · 16

• https://osv.dev/vulnerability/DEBIAN-CVE-2025-11677 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2025-11677 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-11678 · Security Note
• https://ubuntu.com/security/CVE-2025-11678 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-8024-1 · Vendor Advisory
• https://osv.dev/vulnerability/OESA-2025-2611 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-11677 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2025-11677 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-11677 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2025-11677 · Vendor Advisory
• https://osv.dev/vulnerability/USN-8024-1 · Vendor Advisory
• https://libwebsockets.org/git/libwebsockets/commit?id=2f082ec31261f556969160143ba94875d783971a · Patch, Vendor Advisory
• https://t.me/cveNotify/139386 · Telegram Post
• https://openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2025-2611 · Note
• https://twitter.com/CVEnew/status/1980270957227802777 · Twitter Post