CVE-2026-19773 libwebsockets - Remote Code Execution

libwebsockets contains a remote code execution caused by improper validation in HTTP/2 HPACK path header parsing, letting remote attackers execute arbitrary code without authentication.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.65% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Remote Code Execution
Impact
Remote Code Execution
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
15 September 2026
Updated
15 October 2026
Weakness
CWE-787

Vendor fix

Update to the latest version of libwebsockets.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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