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  4. CVE 2026 63471 fastapi code generator import time rce via route
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Back to active CVEs
Critical · CVSS 9.3CVE-2026-63471

fastapi-code-generator: Import-time RCE via route path -> unescaped @app.get('...') decoratorCVE-2026-63471

Answer in brief

CVE-2026-63471 records a Critical severity (CVSS 9.3) vulnerability in fastapi-code-generator: Import-time RCE via route path -> unescaped @app.get('...') decorator. The current sources do not mark it as known exploited. The current feed maps koxudaxi/fastapi-code-generator (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 3, 2026Updated Nov 3, 2026Source checked Nov 3, 2026First seen by HOL Nov 3, 2026Material review Nov 3, 2026
Upstream Advisory

Key facts

Risk
Critical · CVSS 9.3
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 9.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps koxudaxi/fastapi-code-generator (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
koxudaxi/fastapi-code-generatorgeneric<0.8.10.8.1

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for koxudaxi/fastapi-code-generator.
  2. 2Review the reported fix. Update koxudaxi/fastapi-code-generator to 0.8.1 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 3, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 3, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 3, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

fastapi-code-generator creates FastAPI applications from OpenAPI files. Prior to 0.8.1, the generator inserts an OpenAPI path into a generated @app.get(...) route decorator as a single-quoted generated route string without escaping embedded quotes. An attacker-controlled or attacker-influenced OpenAPI path can close the string and inject a valid Python expression into the decorator argument. Syntax-breaking input only causes generation to fail, but syntactically valid generated code executes with the application's or CI process's privileges when the generated module is imported and the decorator is evaluated. This OpenAPI path sink is distinct from the project's separate operation-summary docstring and additional-response-key sinks. This issue is fixed in version 0.8.1.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
RCE
EPSS
Not reported
CWE IDs
CWE-94, CWE-116
Source
CVE List V5
Source checked
Nov 3, 2026
References
4 linked sources
Open source record