JSON::XS versions from 3.0 before 4.05 for Perl read freed stack memory when a FREEZE result's serialisation grows the
Source GCVE Database
Not known to be exploited : upgrade to 4.05 when convenient.
Data as of 14 Nov 2026, 13:17 UTC
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
Disclosed: evidence found.
CVE published 14 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
| Product | Affected | Fixed in |
|---|---|---|
| JSON-XS | Affected
| Fixed in
|
CPANJSON-XSpkg:cpan/JSON-XSOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
Description
JSON::XS versions from 3.0 up to but not including 4.05 for Perl have a vulnerability where reading freed stack memory can occur during serialization with allow_tags enabled. This happens when an object's FREEZE method returns values that cause the Perl stack to grow and be reallocated, leaving saved pointers referencing freed memory. The encoding process may then read this freed memory and can return undef without an error.