SB2026021228 - Ubuntu update for libwebsockets 

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Main Vulnerability Database SB2026021228

SB2026021228 - Ubuntu update for libwebsockets

Published: February 12, 2026

Security Bulletin ID SB2026021228
Severity
High
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

High 50% Medium 50%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 secuirty vulnerabilities.


1) Use-after-free (CVE-ID: CVE-2025-11677)

The vulnerability allows a remote attacker to perform a denial of service attack.

The vulnerability exists due to a use-after-free error within the lws_handshake_server() function in lib/roles/http/server/server.c. A remote attacker can send specially crafted data to the application and perform a denial of service attack.



2) Stack-based buffer overflow (CVE-ID: CVE-2025-11678)

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error within the lws_adns_parse_label() function in lib/system/async-dns/async-dns-parse.c. A remote unauthenticated attacker can trigger a stack-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.


Remediation

Install update from vendor's website.

References