CVE-2026-110755 Text::CSV_XS versions before 1.65 for Perl allow quadratic CPU use by copying the unparsed remainder per record of CR-only input in getline.
Attackers can cause excessive CPU consumption in Text::CSV_XS by sending CSV data with CR-only line endings, leading to denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-110755?
CVE-2026-110755 is a high-severity denial of service 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 allow quadratic CPU use by copying the unparsed remainder per record of CR-only input in getline.
With eol unset, the default, getline reads with Perl's default line separator, so input with CR-only line endings arrives as one chunk. After each record the parser copies the whole unparsed remainder into a new buffer, which the next call parses and copies again, so the work grows with the square of the input size.
A reader with default options that is sent CSV with classic Mac line endings spends seconds of CPU time on a megabyte of input.
Weakness: CWE-407
Which versions are affected by CVE-2026-110755?
How do I fix CVE-2026-110755?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-110755 being exploited?
There is no known exploitation of CVE-2026-110755 in the wild and no public exploit code.
Sources
Also known as AZL-109751, DEBIAN-CVE-2026-110755, GHSA-chcw-qm6q-pg64, UBUNTU-CVE-2026-110755.