Summary
It was discovered that libwebsockets did not properly validate
user-supplied data when parsing HTTP/2 HPACK path headers, which could
result in a write past the end of an allocated buffer. An attacker could
possibly use this issue to execute arbitrary code. (CVE-2026-19773)
It was discovered that libwebsockets did not properly handle CBOR
recording in the LECP parser, which could result in a write past the end
of an allocated buffer. An attacker could possibly use this issue to
cause a crash or execute arbitrary code. (CVE-2026-78161)
Fixed packages 6
| Release | Package | Fixed in |
|---|---|---|
| Ubuntu · Pro 16.04 LTS Pro:16.04:LTS | libwebsockets | 1.7.1-1ubuntu0.1~esm1 |
| Ubuntu · Pro 18.04 LTS Pro:18.04:LTS | libwebsockets | 2.0.3-3ubuntu0.1~esm1 |
| Ubuntu · Pro 20.04 LTS Pro:20.04:LTS | libwebsockets | 3.2.1-3ubuntu0.1~esm3 |
| Ubuntu · Pro 22.04 LTS Pro:22.04:LTS | libwebsockets | 4.0.20-2ubuntu1.1+esm2 |
| Ubuntu · Pro 24.04 LTS Pro:24.04:LTS | libwebsockets | 4.3.3-1.1ubuntu0.1~esm3 |
| Ubuntu · Pro 26.04 LTS Pro:26.04:LTS | libwebsockets | 4.3.5-3ubuntu1.2+esm1 |
Vulnerabilities 1
-
Critical 9.8
libwebsockets HTTP/2 HPACK Path Header Parsing Out-Of-Bounds Write Remote Code Execution Vulnerability
libwebsockets HTTP/2 HPACK Path Header Parsing Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of libwebsockets. Authentication is not required to exploit …
References
-
report
https://ubuntu.com/security/CVE-2026-19773