CVE-2026-119723 Denial of service in HHVM
Unauthenticated attackers can crash HHVM servers with crafted nested array request variables.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Harmful if only installed
- No
- Needs a specific call
- No
- Fix
- None listed
What is CVE-2026-119723?
CVE-2026-119723 is a denial of service vulnerability in Facebook HHVM, published on 11 Nov 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
When parsing request variables such as query-string and form parameters, HHVM did not check that appending a nested array succeeded before descending into it. A remote, unauthenticated attacker could send a GET or POST request which would crash the HHVM server process before any application code runs, leading to denial of service. This issue affected HHVM prior to 23c061f4e804a51badd5f85227e65185651253b5.
Which versions are affected by CVE-2026-119723?
An affected version is exposed as installed. No special setting or call is needed.
How do I fix CVE-2026-119723?
No fix has been published for CVE-2026-119723 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-119723 being exploited?
There is no known exploitation of CVE-2026-119723 in the wild and no public exploit code.
Sources
Also known as GHSA-cr6x-jqxp-2v2p.