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Text::CSV_XS for Perl drops record ends on invalid UTF-8 in print

Priority MEDIUM 49CWE-116Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 3 without a fix

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

Summary

Text-CSV_XS for Perl, versions before 1.65, drops the end of a record and its line ending when a UTF-8 flagged field precedes invalid UTF-8 bytes in print. Print holds back trailing invalid bytes at each buffer flush and never writes them after the final flush (CWE-116), so the last field's bytes, any closing quote and the line ending are lost while print still returns true. The next record may then be written onto the same line, or a missing closing quote makes a reader treat following records as part of that field. The CVSS 3.1 rating is 9.8 critical, reachable over the network without privileges or user interaction.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

Text::CSV_XS versions before 1.65 for Perl drop the end of a record and its line ending when a UTF-8 flagged field precedes invalid UTF-8 bytes in print. When a record contains a UTF-8 flagged field, print holds back trailing bytes that are not valid UTF-8 at each buffer flush, so that a character split across two flushes can be completed. Nothing writes the held-back bytes after the record's final flush. A record whose last field ends in such a byte loses it, any closing quote and the line ending, while print still returns true. combine is not affected. The next record is written onto the same line, or, when the last field was quoted, the missing closing quote makes a reader take every following record as part of that field.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00407 35th percentileScored 2026-11-07
Fix Partial Text-CSV_XS: 1.65Red Hat: 3 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

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

Affected products

VendorProductAffected versionsFixed inStatusSource
—Text-CSV_XSbefore 1.651.65Patch availableCNA
  • Text-CSV_XS Vendor— Affected before 1.65 Fixed in 1.65 Patch available CNA

Remediation

Upgrade Text-CSV_XS to version 1.65 or later, which fixes the flaw. Red Hat rates this Moderate and lists Red Hat Enterprise Linux 7, 9 and 10 as affected with no available fix plan.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

  • Fix · CNA Text-CSV_XS Fixed in 1.65

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 7AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 9AffectedNo fix yet: Fix deferred

Timeline

  1. 2026-10-18 Threatist record created from CVE-2026-110756
  2. 2026-10-18 Alias added: GHSA-fvcq-fpcj-xxcc
  3. 2026-10-18 Affected versions changed · Red Hat
  4. 2026-10-18 CVSS score added · Red Hat
  5. 2026-10-20 CVSS score added · CISA ADP
  6. 2026-10-20 CISA SSVC decision points changed
  7. 2026-10-20 Priority changed: LOW → MEDIUM

References

Sources