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VulnerabilityPublished

CVE-2026-129115: JSON-XS (Perl module) · Use After Free

Affects JSON-XS (Perl module)Source CVE Database V5

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Not known to be exploited : upgrade to 4.05 when convenient.

Data as of 14 Nov 2026, 12:17 UTC

Severity
Medium

Rated Medium 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
  • >=3.0 <4.05
Fixed in
  • 4.05
CPANJSON-XSpkg:cpan/JSON-XSOther threatsAffected
  • >=3.0 <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

Upgrade JSON::XS to version 4.05 or later, where this use-after-free vulnerability is fixed. No other mitigation or temporary workaround is indicated in the available data.

Description

CVE-2026-129115 is a use-after-free vulnerability in JSON::XS for Perl versions 3.0 up to but not including 4.05. The flaw occurs when encoding objects with allow_tags enabled, where the FREEZE method's serialization can cause the Perl stack to grow and reallocate, leaving saved pointers referencing freed memory. This can lead to reading freed stack memory and potentially returning undefined values without error during encoding.

References

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