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TI-2025-27319 Aliases CVE-2025-40928GHSA-v8qr-gpx9-78rm

Heap-based buffer overflow in MLEHMANN JSON::XS

Priority HIGH 66CWE-122Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-122 and the CVSS impact.

Summary

JSON::XS before version 4.04 for Perl has an integer buffer overflow causing a segfault when parsing crafted JSON, enabling denial-of-service attacks or other unspecified impact

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00673 52nd percentileScored 2026-11-07
Fix Fixed JSON::XS (MLEHMANN): 4.04Red Hat: 4 advisories

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MLEHMANNJSON::XSbefore 4.044.04Patch availableCNA
  • JSON::XS VendorMLEHMANN Affected before 4.04 Fixed in 4.04 Patch available CNA

Remediation

  • Fix · CNA JSON::XS (MLEHMANN) Fixed in 4.04

Red Hat 4 advisories

  • RHSA-2025:17430 Released 2025-10-07 · Red Hat rating Moderate
    perl-JSON-XS security update
    • Red Hat CodeReady Linux Builder EUS (v.9.4) perl-JSON-XS-1:4.03-5.el9_4.1
  • RHSA-2025:17163 Released 2025-10-01 · Red Hat rating Moderate
    perl-JSON-XS security update
    • Red Hat Enterprise Linux CRB (v. 8) perl-JSON-XS-1:3.04-4.el8_10
  • RHSA-2025:17162 Released 2025-10-01 · Red Hat rating Moderate
    perl-JSON-XS security update
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) perl-JSON-XS-1:4.04-1.el9_6
Show 1 more Red Hat advisories
  • RHSA-2025:17119 Released 2025-09-30 · Red Hat rating Moderate
    perl-JSON-XS security update
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) perl-JSON-XS-1:4.04-1.el10_0

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat CodeReady Linux Builder EUS (v.9.4)Fixed RHSA-2025:17430
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2025:17163
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2025:17119
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2025:17162

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-40928
  2. 2026-10-03 Alias added: GHSA-v8qr-gpx9-78rm
  3. 2026-10-18 EPSS moved to the 50th–90th percentile

References

Patch 1

Other 1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences