CVE-2026-110672 Cpanel::JSON::XS versions before 4.80 for Perl leak the decoded key of an object rejected for a duplicate key or a missing colon in decode_hv.
A memory leak in Cpanel::JSON::XS allows attackers to exhaust process memory by sending malformed JSON, causing denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-110672?
CVE-2026-110672 is a high-severity memory corruption vulnerability, published on 19 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Cpanel::JSON::XS versions before 4.80 for Perl leak the decoded key of an object rejected for a duplicate key or a missing colon in decode_hv.
A quoted key of 24 or more bytes, or one containing a non-ASCII byte or an escape sequence, is decoded into a new scalar. Nothing frees that scalar when the object is rejected for a missing ':' after the key or, from 4.09, for a duplicate key. Duplicate keys are an error unless allow_dupkeys, dupkeys_as_arrayref or relaxed is set.
A process that keeps running after a failed decode retains one key per rejected document, with its size chosen by the sender. Repeated requests exhaust process memory.
Weakness: CWE-401
Which versions are affected by CVE-2026-110672?
How do I fix CVE-2026-110672?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-110672 being exploited?
There is no known exploitation of CVE-2026-110672 in the wild and no public exploit code.
Sources
Also known as AZL-109854, DEBIAN-CVE-2026-110672, GHSA-cg4x-76pf-wq6q, UBUNTU-CVE-2026-110672.