CVE-2026-110759 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.
Attackers can cause data corruption by injecting a 0xFF byte into parsed CSV fields when processing specific malformed inputs, affecting applications using Text::CSV_XS.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-110759?
CVE-2026-110759 is a critical vulnerability, published on 16 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-1286
Which versions are affected by CVE-2026-110759?
How do I fix CVE-2026-110759?
Upgrade to a fixed version.
Is CVE-2026-110759 being exploited?
There is no known exploitation of CVE-2026-110759 in the wild and no public exploit code.
Sources
Also known as AZL-109760, DEBIAN-CVE-2026-110759, GHSA-v3f5-7p3g-9fm4, UBUNTU-CVE-2026-110759.