Bug 2497222 (CVE-2026-14803)

Summary: CVE-2026-14803 Mojo::JSON: Mojo::JSON: Denial of Service via unbounded recursion in JSON decoder
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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A flaw was found in Mojo::JSON. This vulnerability allows a remote attacker to cause a Denial of Service (DoS) by providing a specially crafted, deeply nested JSON document. The pure-Perl decoder, used when Cpanel::JSON::XS is not installed or explicitly disabled, processes the document with unbounded recursion, leading to excessive memory consumption and process termination.
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Description OSIDB Bzimport 2026-07-06 02:01:32 UTC 
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.