fastapi-code-generator 0.8.1: 3 security fixes

koxudaxi fastapi-code-generator

fastapi-code-generator (koxudaxi) emits an operation's summary as the generated route handler's docstring, using a triple-quoted string without escaping """. A """ in the summary closes the docstring and, via concatenation, injects a live expression that becomes an expression statement in the handler body -- which runs when the route…

Do this now

Check the fastapi-code-generator advisory for a fix and restrict who can supply OpenAPI specs meanwhile.

Who should check: teams running Python or PyPI packages

First seen: 9 Nov 2026
Last update: 9 Nov 2026, 20:17 UTC
Versions per GitHub advisory, not the vendor: fastapi-code-generator 0.8.1
Identifiers: CVE-2026-63469
CVE-2026-63470
CVE-2026-63471
CVSS: 9.3
Source: GitHub advisory
On the menu as: Python
PyPI packages

Check this repository for exposure to one security incident from pwned.coffee. Report first, change nothing until I say so.

## fastapi-code-generator 0.8.1: 3 security fixes
Severity: critical. Patch status: fix status unknown.
Affected: koxudaxi fastapi-code-generator
Versions per GitHub advisory, not the vendor: fastapi-code-generator 0.8.1
Ids: CVE-2026-63469, CVE-2026-63470, CVE-2026-63471

fastapi-code-generator (koxudaxi) emits an operation's summary as the generated route handler's docstring, using a triple-quoted string without escaping """. A """ in the summary closes the docstring and, via concatenation, injects a live expression that becomes an expression statement in the handler body -- which runs when the route…

## Steps
1. Search every lockfile and manifest (package-lock.json, yarn.lock, pnpm-lock.yaml, requirements*.txt, poetry.lock, uv.lock, composer.lock, go.sum, Cargo.lock, Gemfile.lock) for `fastapi-code-generator`. For each hit, compare the installed version with the version on the same major line (per GitHub advisory, not the vendor, so check the vendor's advisory before treating it as a fix): fastapi-code-generator 0.8.1. If it's lower, give the exact upgrade command for the package manager this repo uses.
2. Versions per GitHub advisory, not the vendor: fastapi-code-generator: older than 0.8.1 → 0.8.1. Don't treat them as a fix until the vendor says so.

## Fix by release line
| Line | State | Fix | Until then |
|---|---|---|---|
| fastapi-code-generator older than 0.8.1 | per GitHub advisory, not the vendor | 0.8.1 | restrict network access to it |

## Report
A table: file, product or package, version in use, affected yes/no, exact fix. Then anything a human has to check outside the repo.

If you have the pwned.coffee MCP server (https://pwned.coffee/mcp), call lookup_cve("CVE-2026-63469") for the latest, and check_repo with this repo's lockfiles, Dockerfiles and workflows for a full receipt.
Sources: https://github.com/advisories/GHSA-h667-4jj2-cgv4 https://github.com/koxudaxi/fastapi-code-generator/commit/49301dbdb82170d7f50877419d994b05cb1fa2bc https://github.com/koxudaxi/fastapi-code-generator/commit/b3b9bd66e0b0c4d8c686fda700258104615a1332 https://github.com/koxudaxi/fastapi-code-generator/security/advisories/GHSA-h667-4jj2-cgv4 https://nvd.nist.gov/vuln/detail/CVE-2026-63470 https://github.com/advisories/GHSA-6xmv-cjr5-w3q8 https://github.com/koxudaxi/fastapi-code-generator/security/advisories/GHSA-6xmv-cjr5-w3q8 https://nvd.nist.gov/vuln/detail/CVE-2026-63469 https://github.com/advisories/GHSA-p2mm-64f6-gmpp https://github.com/koxudaxi/fastapi-code-generator/security/advisories/GHSA-p2mm-64f6-gmpp https://nvd.nist.gov/vuln/detail/CVE-2026-63471
https://pwned.coffee/i/fastapi-code-generator-call-time-rce-via-operation-summa-cve-2026-63470

Timeline

9 Nov 2026, 20:17 UTC
Fix status: patched → unknown.
9 Nov 2026, 20:17 UTC
Fix status: patched → unknown.
9 Nov 2026, 19:19 UTC
Fix status: patched → unknown.
9 Nov 2026
First reported.

Receipt

Exploitation: Public exploit code, no attacks reported
CISA ADP “CISA ADP rates exploitation of CVE-2026-63470 "poc" (SSVC).” source
CISA ADP “CISA ADP rates exploitation of CVE-2026-63469 "poc" (SSVC).” source
CISA ADP “CISA ADP rates exploitation of CVE-2026-63471 "poc" (SSVC).” source
By release line, per GitHub advisory, not the vendor: Product Affected Version named Source
fastapi-code-generator (pip) < 0.8.1 0.8.1 GitHub advisory per GitHub advisory, not the vendor checked 12 Nov
Score: CVSS 9.3 (critical). CVSS 4.0 9.3 (CNA GitHub_M) for CVE-2026-63469
Last checked: 13 Nov 2026, 16:26 UTC

Product	Affected	Version named	Source
fastapi-code-generator (pip)	< 0.8.1	0.8.1	GitHub advisory per GitHub advisory, not the vendor checked 12 Nov

Sources: KEV – CVE record ✓ Vendor –

Sources

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