CVE-2026-123776 RRD::CGI::Image versions through 0.01 for Perl pass CGI query parameters containting "tz" to tzset(), , so a FIFO or device path blocks the CGI process.
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-123776?
CVE-2026-123776 is a critical vulnerability, published on 7 Nov 2026.
Official description
RRD::CGI::Image versions through 0.01 for Perl pass CGI query parameters containting "tz" to tzset(), , so a FIFO or device path blocks the CGI process.
The normalize_params method sends any query key matching /tz/i to tz(), which sets $ENV{TZ} to that value, with no validation. It then calls tzset(). glibc treats a TZ value starting with / or : as a file path and opens it, so a value naming a FIFO or a blocking device stalls the process inside tzset().
Weakness: CWE-1287
Which versions are affected by CVE-2026-123776?
How do I fix CVE-2026-123776?
No fix has been published for CVE-2026-123776 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-123776 being exploited?
There is no known exploitation of CVE-2026-123776 in the wild and no public exploit code.
Sources
Also known as GHSA-vx75-vp6j-73h2.