Is there a public exploit for CVE-2026-124536?

No public exploit for CVE-2026-124536 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

— Unscored

JSON::XS versions before 4.05 for Perl allow memory exhaustion by buffering incremental input past maxsize after a NUL byte in incrparse.

CVE-2026-124536

JSON::XS versions before 4.05 for Perl allow memory exhaustion by buffering incremental input past maxsize after a NUL byte in incrparse. The parser appends each chunk to its buffer and compares maxsize with how far it has progressed, not with the buffer length. It treats a NUL byte as the end of the input, so a NUL within the first maxsize bytes keeps it short of the limit. The buffer keeps growing, and incrskip cannot remove the NUL. A peer streaming data to an incrparse consumer can exhaust process memory regardless of maxsize.

Assessment

CVSS: Not yet scored
Severity: Unscored
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 14 November 2026
Last updated: 14 November 2026
Assigner: CPANSec

At the source

EUVD (ENISA)

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