Read the docs
TI-2026-76556 Aliases CVE-2026-110675GHSA-9hvc-g7pw-p4j7

Cpanel::JSON::XS accepts malformed UTF-8 in bare hash keys under allow_barekey

Priority MEDIUM 42CWE-1286Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.

Summary

Cpanel::JSON::XS versions from 4.33 before 4.80 for Perl accept malformed UTF-8 in bare hash keys when utf8 and allow_barekey are enabled. A quoted key is checked as UTF-8, but a bare key's bytes are stored as a UTF-8 flagged string without any check, so malformed UTF-8, control bytes and backslashes reach the decoded hash. The same bytes in a quoted key or a value are rejected, and later operations on the key, including lc, uc or re-encoding the hash, die with a malformed UTF-8 error.

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

Description from the CNA

Cpanel::JSON::XS versions from 4.33 before 4.80 for Perl accept malformed UTF-8 in bare hash keys under allow_barekey in decode_hv. With utf8 and allow_barekey, which relaxed enables, a quoted key is validated as UTF-8 but a bare key's bytes are stored as a UTF-8 flagged string without any check. Malformed UTF-8, control bytes and backslashes reach the decoded hash, while malformed UTF-8 and control bytes in a quoted key or a value are rejected. Later operations on the key, including lc, uc or encoding the hash again, die with a malformed UTF-8 error.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00454 39th 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-XS4.33 to before 4.804.80Patch availableCNA
  • Cpanel-JSON-XS Vendor— Affected 4.33 to 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-2026-110675
  2. 2026-10-20 Alias added: GHSA-9hvc-g7pw-p4j7
  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