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Memory exhaustion in Text::CSV_XS Perl module via fragment selector

Priority LOW 39CWE-770Published · 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
Partial Red Hat: 3 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-770.

Summary

Text-CSV_XS before 1.65 for Perl expands an RFC 7111 row or col selector in fragment into one array element per selected index before reading any data (CWE-770). An explicit end column in a cell selector is not clamped to the row, so a large range allocates excessive memory. An unauthenticated remote attacker can exhaust memory when an application passes a request-supplied fragment to fragment or csv, which ends the process with an Out of memory error that eval cannot catch.

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 allow memory exhaustion by allocating one entry per index of an RFC 7111 selector in fragment. fragment expands a row= or col= selector into an array with one element per selected index before it reads any data, and it does not clamp an explicit end column in a cell= selector to the row. Only the syntax and order of the ranges are checked, so row=1-400000000 on a two-line file allocates 400 million elements. An application that passes a request-supplied fragment to fragment or csv can be made to exhaust memory, which ends the process with an Out of memory error that eval cannot catch.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00408 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
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
—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. The sources list no fixed version for Red Hat Enterprise Linux 7, 9 and 10.

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: Important. Red Hat's page for this CVE →

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

Timeline

  1. 2026-10-18 Threatist record created from CVE-2026-110752
  2. 2026-10-18 Alias added: GHSA-c8hf-63cr-rrfm
  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

References

Sources