Vulnerability record/PUBLISHED/Published Nov 14, 2026 11:52:57 UTC
CVE-2026-124540
JSON::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.
Base scoreN/A/ 10
SeverityNoneCVSS unscored
Exploitability / impact
CVSS metric breakdown
Base severityNone
No CVSS vector is available for this record.
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Record context
CVE Numbering AuthorityCPANSec
Last updatedNov 14, 2026 11:52:57 UTC
PublishedNov 14, 2026 11:52:57 UTC
ReservedNov 8, 2026 12:32:29 UTC