JSON::XS versions before 4.05 for Perl allow stack exhaustion via nested tagged values under allow_tags in decode_tag

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-124540
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-14 12:17:43 UTC
Updated2026-11-14 12:17:43 UTC
DescriptionJSON::XS versions before 4.05 for Perl allow stack exhaustion via nested tagged values under allow_tags in decode_tag. With allow_tags, "(" starts a tagged value. Its tag and value are decoded recursively, and each can start another tagged value. Unlike arrays and objects, this nesting is not counted against max_depth. A run of "(" bytes exhausts the C stack and triggers an uncatchable segmentation fault regardless of max_depth.

Risk And Classification

Problem Types: CWE-674 | CWE-674 CWE-674 Uncontrolled Recursion

References

ReferenceSourceLinkTags
metacpan.org/release/MLEHMANN/JSON-XS-4.05/changes 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
CNA2026-11-13T00:00:00.000ZVersion 4.05 released with fix.

Solutions

CNA: Upgrade to JSON-XS 4.05 or later.

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