What is GHSA-pmcq-254w-hhrg?

GHSA-pmcq-254w-hhrg is a security advisory published by GitHub Security Advisories with unknown severity. JSON::XS versions before 4.05 for Perl leak the decoded key of an object rejected for a missing...

Which CVE IDs does GHSA-pmcq-254w-hhrg cover?

GHSA-pmcq-254w-hhrg covers the following CVE IDs: CVE-2026-124539. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

GHSA-pmcq-254w-hhrgunknown

JSON::XS versions before 4.05 for Perl leak the decoded key of an object rejected for a missing...

Vendor

GitHub Security Advisories

Published

November 14, 2026

Last Modified

November 14, 2026

🔗 CVE IDs covered (1)

CVE-2026-124539 →

📋 Description

JSON::XS versions before 4.05 for Perl leak the decoded key of an object rejected for a missing colon in decode_hv.

Unless it is short plain ASCII, a quoted key is decoded into a new scalar. Nothing frees that scalar when the object is rejected for a missing ':' after the key.

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.

🔗 References (3)

https://nvd.nist.gov/vuln/detail/CVE-2026-124539
https://metacpan.org/release/MLEHMANN/JSON-XS-4.05/changes
https://github.com/advisories/GHSA-pmcq-254w-hhrg