Skip to main content
VulnerabilityPublished

CVE-2026-124536: JSON::XS versions before 4.05 for Perl allow memory exhaustion by buffering incremental input past

Source GCVE Database

0
Compare
Authoritative record:CVE-2026-124536· High

Not known to be exploited : upgrade to 4.05 soon.

Data as of 14 Nov 2026, 13:18 UTC

Severity
High

Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none
Patch
Available – fixed in 4.05

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 14 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 14 Nov 2026.

What to do

Upgrade JSON-XS (Perl module) to 4.05.

Affected software

ProductAffectedFixed in
JSON-XSAffected
  • <4.05
Fixed in
  • 4.05
CPANJSON-XSpkg:cpan/JSON-XSOther threatsAffected
  • <4.05
Fixed in
  • 4.05

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Users should upgrade to JSON::XS version 4.05 or later once available, as the vulnerability affects versions before 4.05. Until then, consider limiting exposure to untrusted incremental JSON input streams or applying application-level input validation to mitigate memory exhaustion risks.

Description

JSON::XS versions before 4.05 for Perl have a vulnerability in the incremental parser (incr_parse) that allows memory exhaustion. The parser buffers input chunks and incorrectly handles NUL bytes, causing the buffer to grow beyond the configured max_size limit. This can lead to process memory exhaustion when processing crafted input streams.

References

Community reviews

Loading reviews…