by Kastro
Paper/Archive/CVE-2026-110685

CVE-2026-110685

CPANSec — Cpanel::JSON::XS versions before 4.80 for Perl leak the decoded arguments of a tagged value when its THAW method dies in decode_tag

EPSS 0.2%CVSS 9.1
critical.is priorityof 100
29
CVSS 9.1 (ADP)9.1 / 10 × 3027.3Not in CISA KEV+300.0EPSS percentile 6.5.065 × 201.3No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

Cpanel::JSON::XS versions before 4.80 for Perl leak the decoded arguments of a tagged value when its THAW method dies in decode_tag. With allow_tags, a tagged value's class name and argument array are decoded and passed to the class's THAW method. Both are released only after THAW returns, so a THAW that dies leaves the whole decoded argument structure allocated. Each rejected document leaks data of a size the sender chooses, so a process that catches the error and keeps running exhausts its memory.

Affected

ProductAffectedFixed inSource
Cpanel-JSON-XS< 4.804.80CNA

Scores by source

CISA ADP9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: partial

References

patchgithub.com/rurban/Cpanel-JSON-XS/commit/9ab010221c069a7af9ef7463454ecd3b8ace9c58.patchrefmetacpan.org/release/RURBAN/Cpanel-JSON-XS-4.80/changes