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TI-2026-76564 Aliases CVE-2026-110685GHSA-mv2h-wx54-jcf9

Memory leak in Cpanel::JSON::XS when a THAW method dies

Priority MEDIUM 46CWE-401Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-401.

Summary

Cpanel::JSON::XS versions before 4.80 for Perl leak memory when a tagged value's THAW method dies during decode_tag with allow_tags enabled. The decoded class name and argument array are only released after THAW returns, so a THAW that dies keeps the whole decoded argument structure allocated (CWE-401). An unauthenticated remote attacker can send crafted documents, each leaking an amount of memory the sender chooses, so a process that catches the error and keeps running can exhaust its memory.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

Cpanel::JSON::XS versions before 4.80 for Perl leak the decoded arguments of a tagged value when its THAW method dies in decode_tag. With allow_tags, a tagged value's class name and argument array are decoded and passed to the class's THAW method. Both are released only after THAW returns, so a THAW that dies leaves the whole decoded argument structure allocated. Each rejected document leaks data of a size the sender chooses, so a process that catches the error and keeps running exhausts its memory.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00508 43rd percentileScored 2026-11-07
Fix Fixed Cpanel-JSON-XS: 4.80

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
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
—Cpanel-JSON-XSbefore 4.804.80Patch availableCNA
  • Cpanel-JSON-XS Vendor— Affected before 4.80 Fixed in 4.80 Patch available CNA

Remediation

Upgrade Cpanel-JSON-XS to version 4.80 or later.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

  • Fix · CNA Cpanel-JSON-XS Fixed in 4.80

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-20 Threatist record created from CVE-2026-110685
  2. 2026-10-20 Alias added: GHSA-mv2h-wx54-jcf9
  3. 2026-10-20 Affected versions changed · Red Hat
  4. 2026-10-20 CVSS score added · Red Hat
  5. 2026-10-21 CVSS score changed · Red Hat
  6. 2026-10-29 CVSS score added · CISA ADP
  7. 2026-10-29 CISA SSVC decision points changed
  8. 2026-10-29 Priority changed: LOW → MEDIUM

References

Patch 1

Other 1

Sources

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