CVE-2026-124540: JSON-XS (Perl module) · Uncontrolled Recursion
Affects JSON-XS (Perl module)Source CVE Database V5
Not known to be exploited : upgrade to 4.05 soon.
Data as of 14 Nov 2026, 12:17 UTC
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
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.
AI-suggested
Upgrade JSON::XS to version 4.05 or later, where this vulnerability is fixed. No other mitigations are effective because the recursion is uncontrolled and not limited by max_depth. Since a fixed version is available, applying the official patch is the recommended remediation.
Description
CVE-2026-124540 is a vulnerability in JSON::XS for Perl before version 4.05 that allows stack exhaustion via uncontrolled recursion when decoding nested tagged values with allow_tags enabled. This leads to an uncatchable segmentation fault caused by C stack exhaustion regardless of the max_depth setting.