Vulnerability · Published Oct 16, 2026 · Assigned by CPANSec
CVE-2026-110759Text::CSV_XS versions before 1.65 for Perl return a 0xFF byte that is not in the input for an empty last field followed by a lone CR in parse
Critical 9.8
In plain English
A critical-severity security flaw in Text-CSV_XS. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Text::CSV_XS versions before 1.65 for Perl return a 0xFF byte that is not in the input for an empty last field followed by a lone CR in parse. When the input to parse ends in a separator and a lone CR, the parser treats the end of the input as the next character and stores the end-of-file marker in the field as the byte 0xFF. With binary set, parse("a,\r") returns the fields "a" and "\xFF". On UTF-8 flagged input the last field is a UTF-8 flagged string holding that lone byte, which is malformed UTF-8. The same input with a non-empty last field is rejected as an error. A CRLF file read line by line and chomped ends this way when its last column is empty, so the application receives a byte that is not in its input.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | libtext-csv-xs-perl | no fix listed | DEBIAN-CVE-2026-110759 |
| Debian:13 | libtext-csv-xs-perl | no fix listed | DEBIAN-CVE-2026-110759 |
| Debian:14 | libtext-csv-xs-perl | 1.65-1 | DEBIAN-CVE-2026-110759 |
| Ubuntu:22.04:LTS | libtext-csv-xs-perl | no fix listed | UBUNTU-CVE-2026-110759 |
| Ubuntu:24.04:LTS | libtext-csv-xs-perl | no fix listed | UBUNTU-CVE-2026-110759 |
| Ubuntu:26.04:LTS | libtext-csv-xs-perl | no fix listed | UBUNTU-CVE-2026-110759 |
| Ubuntu:26.10 | libtext-csv-xs-perl | no fix listed | UBUNTU-CVE-2026-110759 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Text-CSV_XS | 0 – before 1.65 |
Weakness: CWE-1286 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H