What is GHSA-mjfh-hmwc-q348?

GHSA-mjfh-hmwc-q348 is a security advisory published by GitHub Security Advisories with High severity. Cpanel::JSON::XS versions from 4.28 before 4.80 for Perl leak the array collecting duplicate key...

Which CVE IDs does GHSA-mjfh-hmwc-q348 cover?

GHSA-mjfh-hmwc-q348 covers the following CVE IDs: CVE-2026-110677. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-mjfh-hmwc-q348?

GHSA-mjfh-hmwc-q348 has a CVSS v3 base score of 7.5, published by GitHub Security Advisories.

GHSA-mjfh-hmwc-q348HighCVSS 7.5

Cpanel::JSON::XS versions from 4.28 before 4.80 for Perl leak the array collecting duplicate key...

Vendor

GitHub Security Advisories

Published

October 19, 2026

Last Modified

October 29, 2026

🔗 CVE IDs covered (1)

CVE-2026-110677 →

📋 Description

Cpanel::JSON::XS versions from 4.28 before 4.80 for Perl leak the array collecting duplicate key values under dupkeys_as_arrayref in decode_hv.

With dupkeys_as_arrayref, the values of a duplicate object key are collected into a new array. An extra reference is never released, so the array and every value in it outlive the decoded structure. The array also leaks when decoding fails after a duplicate key.

Repeatedly decoding untrusted JSON with a duplicate key holding a large value exhausts process memory.

🔗 References (4)

https://nvd.nist.gov/vuln/detail/CVE-2026-110677
https://github.com/rurban/Cpanel-JSON-XS/commit/edb13030a708afc2cde0d2629fb6bdd31288ce6c.patch
https://metacpan.org/release/RURBAN/Cpanel-JSON-XS-4.80/changes
https://github.com/advisories/GHSA-mjfh-hmwc-q348