EUVD-2026-39792
GHSA-4r2j-8c42-5wfc
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSTI yields code execution with full C/I/A loss; AV:N/PR:N/UI:N assumes an unauthenticated input path reaches the evaluator, which is application-dependent but consistent with the reported vector.
Primary rating from Vendor (certcc).
CVSS VectorVendor: certcc
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionCVE.org
Server side template inject (SSTI) in the expression evaluation component in Genshi Template Engine version 0.7.9 allows a remote attacker to achieve remote code execution (RCE) via crafted template expressions.
AnalysisAI
Server-side template injection in Edgewall's Genshi template engine (versions 0 through 0.7.9) lets a remote attacker reach the expression-evaluation component and run arbitrary Python code on the host. Because Genshi evaluates template expressions as Python, any application that feeds attacker-controlled input into a Genshi expression can be driven to full remote code execution. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target application route attacker-controllable input into Genshi's expression-evaluation component - i.e., user input that reaches a template expression or a dynamically constructed template - on Genshi version 0.7.9 or earlier. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The published CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, base 9.8) describes a maximally severe network, low-complexity, unauthenticated path to full confidentiality, integrity, and availability loss. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An application uses Genshi to render templates and incorporates user-controlled input (for example a profile field, report parameter, or wiki macro argument) into a template expression. The attacker submits a crafted expression payload over the network; Genshi's expression evaluator compiles and executes it as Python, yielding remote code execution as the rendering process. … |
| Remediation | No vendor-released patch identified at time of analysis - the provided references point only to the Genshi GitHub repository (https://github.com/edgewall/genshi/) and the CERT/CC advisory (https://www.kb.cert.org/vuls/id/244846), with no tagged fixed release named, so monitor those for an upstream patch and upgrade to it once published. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Scan all systems and applications to identify Genshi usage and document affected versions (0 through 0.7.9), locations, and operational criticality. …
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External POC / Exploit Code
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