CVE-2026-124536: JSON-XS (Perl module) · Unthrottled Resource Allocation
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 indicated. Since this is a library vulnerability, applying the official fix is the recommended remediation.
Description
CVE-2026-124536 is a vulnerability in JSON::XS for Perl versions before 4.05 that allows memory exhaustion. The flaw arises because the incremental parser buffers input beyond the configured max_size limit when a NUL byte is present, leading to unbounded memory growth. This can cause the process to exhaust available memory when processing crafted input streams.