Memory exhaustion in Text::CSV_XS Perl module via fragment selector
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
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
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | Text-CSV_XS | before 1.65 | 1.65 | Patch available | CNA |
- 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 →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet |
| Red Hat Enterprise Linux 7 | Affected | No fix yet |
| Red Hat Enterprise Linux 9 | Affected | No fix yet |
Timeline
- 2026-10-18 Threatist record created from CVE-2026-110752
- 2026-10-18 Alias added: GHSA-c8hf-63cr-rrfm
- 2026-10-18 Affected versions changed · Red Hat
- 2026-10-18 CVSS score added · Red Hat
- 2026-10-20 CVSS score added · CISA ADP
- 2026-10-20 CISA SSVC decision points changed
References
Sources
- CVE-2026-110752 · CVE Program
- CVE-2026-110752 · NVD
- FIRST EPSS
- GHSA-c8hf-63cr-rrfm · GitHub Advisory Database · CC BY 4.0
- CVE-2026-110752 · Red Hat security data · CC BY 4.0
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