JSON::XS versions from 4.0_00 before 4.05 for Perl corrupt the incremental buffer length by chopping past its end in incr_skip after a top-level number

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-129113
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 from 4.0_00 before 4.05 for Perl corrupt the incremental buffer length by chopping past its end in incr_skip after a top-level number. The incremental parser scans any run of digits, signs, dots and exponent markers as one number, but the decoder stops at the end of a valid number, so the parser keeps an offset into bytes it has not decoded. It then empties the buffer without clearing those bytes, and a later incr_parse call without new input reads them again and moves the offset past the end of the buffer. incr_skip, the documented recovery after an error, removes that many bytes and the buffer length wraps. A peer sending input such as "1-2" to an incr_parse consumer can make the next read of incr_text exit the process through perl's uncatchable out-of-memory path.

Risk And Classification

Problem Types: CWE-191 | CWE-191 CWE-191 Integer Underflow (Wrap or Wraparound)

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

Vendor Comments And Credit

Discovery Credit

CNA: Albert Gierlach (rivit) (en)

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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