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CVE-2026-79310

webpy web.py 0.76 is vulnerable to server-side template injection (SSTI). The template engine can...

8.5 High

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

0.67%Unchanged since Sep 24, 2026
90%50%10%1%

What each source reports

CVE List Score used 8.5

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.

Record
CVE-2026-79310
CVSS 3.1
8.5 HighCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Weakness
CWE-94
Updated
2026-11-02
EUVDEUVD-2026-85403 8.5

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.

Record
EUVD-2026-85403
CVSS 3.1
8.5 HighCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Updated
2026-11-02
GitHub AdvisoriesGHSA-8m9w-mh94-cwr6 8.5

webpy web.py 0.76 is vulnerable to server-side template injection (SSTI). The template engine can...

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.

Record
GHSA-8m9w-mh94-cwr6
CVSS 3.1
8.5 HighCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Weakness
CWE-94
Updated
2026-11-02
NVD 8.5

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.

Record
CVE-2026-79310
CVSS 3.1
8.5 HighCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Weakness
CWE-94
Updated
2026-11-02
OSVDEBIAN-CVE-2026-79310 8.5

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.

Record
DEBIAN-CVE-2026-79310
CVSS 3.1
8.5 HighCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2026-79310 8.5

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.

Record
UBUNTU-CVE-2026-79310
CVSS 3.1
8.5 HighCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Updated
2026-11-02

Affected packages

Affected packages
PackageAffectedFixed
webpy
Debian:12
All versions, plus listed versions
1:0.62-41:0.62-4+deb12u11:0.62-51:0.62-61:0.70-11:0.76-1
None known
webpy
Debian:13
All versions, plus listed versions
1:0.62-61:0.70-11:0.76-1
None known
webpy
Debian:14
All versions, plus listed versions
1:0.62-61:0.70-11:0.76-1
None known
webpy
Ubuntu:Pro:16.04:LTS
All versions, plus listed versions
1:0.37+20120626-11:0.37+20120626-1ubuntu0.1~esm1
None known
webpy
Ubuntu:Pro:18.04:LTS
All versions, plus listed versions
1:0.38-11:0.38+20170615-11:0.38+20170615-1ubuntu0.1~esm1
None known
webpy
Ubuntu:Pro:20.04:LTS
All versions, plus listed versions
1:0.39+20181101-11:0.40-21:0.40-2ubuntu0.1~esm1
None known
webpy
Ubuntu:Pro:22.04:LTS
All versions, plus listed versions
1:0.61-11:0.61-1ubuntu0.1~esm1
None known
webpy
Ubuntu:Pro:24.04:LTS
All versions, plus listed versions
1:0.62-41:0.62-4ubuntu0.1~esm1
None known
webpy
Ubuntu:26.10
All versions, plus listed versions
1:0.62-61:0.70-11:0.76-1
None known
webpy
Ubuntu:26.04:LTS
All versions, plus listed versions
1:0.62-6
None known

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-79310 is a high vulnerability (CVSS 8.5) in webpy, published September 23, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.67%, the 52nd percentile. No source names a fixed version.

References

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