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CVE-2026-14803 is a denial-of-service vulnerability in Mojo::JSON in the Mojolicious Perl distribution affecting versions before 9.47. The flaw is in the pure-Perl JSON decode path, where _decode_value dispatches recursively into _decode_array and _decode_object without any depth limit. As a result, a small but deeply nested JSON document can drive unbounded recursion and excessive memory consumption during parsing. The issue affects applications that decode untrusted JSON through Mojo::JSON, including code paths such as Mojo::Message::json reachable via $c->req->json. The Cpanel::JSON::XS fast path is not affected.
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What an attacker gets, and what they’ve been doing with it.
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Cpanel::JSON::XS is installed and available in the include path, and do not set MOJO_NO_JSON_XS=1. Where feasible, enforce limits on JSON nesting depth or reject excessively nested JSON input before it reaches Mojo::JSON.Patch, then assume compromise.
cc38b0554275c4d84f6b8b49bcbbc1bec2068fe1.No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
9 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.