Is there a public exploit for CVE-2026-129115?

No public exploit for CVE-2026-129115 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 from 3.0 before 4.05 for Perl read freed stack memory when a FREEZE result's serialisation grows the Perl stack under…

CVE-2026-129115

JSON::XS versions from 3.0 before 4.05 for Perl read freed stack memory when a FREEZE result's serialisation grows the Perl stack under allowtags in encoderv. With allowtags, an object's FREEZE method is called in list context and each returned value is encoded through a saved Perl stack pointer. When encoding a returned value calls back into Perl, through TOJSON under convertblessed or another FREEZE, and that callback grows the stack, the stack is reallocated while the saved pointer still refers to the freed block. Encoding such objects reads freed memory, and encode can return undef without an error.

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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