Vulnerability · Published Sep 23, 2026 · Assigned by mitre
CVE-2026-79310
High 8.5
In plain English
A high-severity code injection in the webpy package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 52% of all known vulnerabilities).
Official description
webpy web.py 0.76 is vulnerable to server-side template injection (SSTI). The template engine can be tricked into executing attacker-controlled template code that built-in security checks are designed to reject. When an application precompiles templates from a directory the attacker can write to and later renders them through the precompiled template loader, the sandbox is bypassed and the attacker's code runs, resulting in arbitrary Python code execution and OS command execution on the server.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | webpy | no fix listed | DEBIAN-CVE-2026-79310 |
| Debian:13 | webpy | no fix listed | DEBIAN-CVE-2026-79310 |
| Debian:14 | webpy | no fix listed | DEBIAN-CVE-2026-79310 |
| Ubuntu:26.04:LTS | webpy | no fix listed | UBUNTU-CVE-2026-79310 |
| Ubuntu:26.10 | webpy | no fix listed | UBUNTU-CVE-2026-79310 |
Affected products (as reported)
Weakness: CWE-94 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H