CVE-2026-110756 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.
Attackers can corrupt CSV output by causing data loss and record merging when invalid UTF-8 bytes follow valid UTF-8 fields.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-110756?
CVE-2026-110756 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 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.
Weakness: CWE-116
Which versions are affected by CVE-2026-110756?
How do I fix CVE-2026-110756?
Upgrade to a fixed version.
Is CVE-2026-110756 being exploited?
There is no known exploitation of CVE-2026-110756 in the wild and no public exploit code.
Sources
Also known as AZL-109742, DEBIAN-CVE-2026-110756, GHSA-fvcq-fpcj-xxcc, UBUNTU-CVE-2026-110756.