Vulnerability details
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
CVSS 3.1
9.8Critical
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().
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.8Critical | 3.1 | CISA ADP / Vulnrichment (CISA-ADP) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| No product information recorded. | |||
References and advisories
4- https://rt.cpan.org/Ticket/Display.html?id=182627 vendor-advisoryissue-trackingpatch
- https://man7.org/linux/man-pages/man3/tzset.3.html technical-description
- https://security.metacpan.org/patches/R/RRD-CGI-Image/0.01/CVE-2026-123776-r1.patch patch
- http://www.openwall.com/lists/oss-security/2026/11/07/11
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Details
- Published
- 2026-11-07
- Last updated
- 2026-11-10
- State
- Published
- Assigner (CNA)
- CPANSec
- Kolun priority
- 19 · Low
Exploit prediction (EPSS)
0.24%
Probability of exploitation in 30 days
15.1%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-1287Improper Validation of Specified Type of Input