PT-2025-42761 · Unknown+3 · Libwebsockets+3

Published 2025-10-20 · Updated 2026-02-11 · CVE-2025-11678

Positive Technologies (AI Summary)

CVSS v4.0

7.5

High

Base vector

AV:A/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/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 A stack-based buffer overflow exists in the lws adns parse label function within libwebsockets. This occurs when the LWS WITH SYS ASYNC DNS flag is enabled during compilation and an attacker crafts a DNS response with a label exceeding the maximum allowed length, after sniffing a DNS request. The overflow impacts the label stack.

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

Stack Overflow

Weakness Enumeration

CWE-121

Related Identifiers

CVE-2025-11678

DLA-4373-1

OESA-2025-2611

RHSA-2025:22969

USN-8024-1

Affected Products

Debian

Linuxmint

Ubuntu

Libwebsockets

References · 16

• https://osv.dev/vulnerability/DEBIAN-CVE-2025-11678 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-11678 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2025-11678 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-11678 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-8024-1 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2025-11678 · Vendor Advisory
• https://osv.dev/vulnerability/OESA-2025-2611 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-11677 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-11677 · Security Note
• https://cve.org/CVERecord?id=CVE-2025-11678 · Security Note
• https://osv.dev/vulnerability/USN-8024-1 · Vendor Advisory
• https://libwebsockets.org/git/libwebsockets/commit?id=2bb9598562b37c942ba5b04bcde3f7fdf66a9d3a · Patch, Vendor Advisory
• https://t.me/cveNotify/139387 · Telegram Post
• https://twitter.com/CVEnew/status/1980276703432679711 · Twitter Post
• https://openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2025-2611 · Note