CVE-2026-79310Network attack vector

Arbitrary code execution via unsafe template precompilation

Published Sep 23, 2026 · Updated Sep 23, 2026

Code injection in webpy web.py 0.76 allows attackers to execute Python and OS commands through a precompiled template. Batch precompilation writes generated Python before applying the security check, and the loader later reuses persisted functions outside the restricted builtins environment. Exploitation requires an attacker-writable template directory, subsequent precompiled loading, and a rendering trigger; code runs with the service process's access.

CVSS severity8.5
High
EPSS probability0.72%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in webpy web.py 0.76 allows attackers to execute Python and OS commands through a precompiled template. Batch precompilation writes generated Python before applying the security check, and the loader later reuses persisted functions outside the restricted builtins environment. Exploitation requires an attacker-writable template directory, subsequent precompiled loading, and a rendering trigger; code runs with the service process's access.

The record

CVE
CVE-2026-79310
Published
Sep 23, 2026
Updated
Sep 23, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-94, T1059.006
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.5TraceLoomCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1059.006Command and Scripting Interpreter: Python

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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