CVE-2026-14803 Mojo::JSON versions before 9.47 for Perl allow memory exhaustion via unbounded recursion in the pure-Perl decoder
Attackers can cause denial of service via memory exhaustion in the pure-Perl JSON decoder when the XS module is disabled or missing.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-14803?
CVE-2026-14803 is a medium-severity denial of service vulnerability in SRI Mojo::JSON, published on 6 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Mojo::JSON versions before 9.47 for Perl allow memory exhaustion via unbounded recursion in the pure-Perl decoder.
The pure-Perl decode path (`_decode_value` dispatching to `_decode_array` and `_decode_object`) recurses with no depth limit, so a small deeply nested JSON document can consume excessive memory.
This path is the default when Cpanel::JSON::XS is not installed or `MOJO_NO_JSON_XS=1` is set; the Cpanel::JSON::XS fast path is not affected.
Any caller that decodes an untrusted JSON body, for example `Mojo::Message::json` reached through `$c->req->json`, can exhaust process memory and cause denial of service.
Weakness: CWE-674
Which versions are affected by CVE-2026-14803?
How do I fix CVE-2026-14803?
Upgrade to a fixed version.
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-2026-14803 being exploited?
There is no known exploitation of CVE-2026-14803 in the wild and no public exploit code.
Sources
Also known as AZL-92078, CVE-2026-68914, DEBIAN-CVE-2026-14803, GHSA-fp7f-j7qv-4qww, MGASA-2026-0269, OESA-2026-3159 and 1 more.