CVE-2026-16632 boazsegev facil.io WebSocket Frame websocket_parser.h websocket_on_protocol_error input validation
Remote attackers can trigger improper input validation in the WebSocket frame parser, potentially causing denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-16632?
CVE-2026-16632 is a medium-severity vulnerability in boazsegev facil.io, published on 22 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A flaw has been found in boazsegev facil.io up to 0.7.4. Affected is the function websocket_on_protocol_error in the library lib/facil/http/parsers/websocket_parser.h of the component WebSocket Frame Parser. This manipulation of the argument on_message causes improper input validation. The attack can be initiated remotely. The exploit has been published and may be used. The project was informed of the problem early through an issue report but has not responded yet.
Weakness: CWE-20
Which versions are affected by CVE-2026-16632?
How do I fix CVE-2026-16632?
No fix has been published for CVE-2026-16632 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-16632 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-16632 exists.
Sources
Also known as GHSA-5g3v-wh7g-2xvv.