# datamodel-code-generator: Protobuf weak-import path traversal allows files to be written outside the temporary directory

Advisory record · `GHSA-77xj-x4rm-935c`

- **Identifiers:** `GHSA-77xj-x4rm-935c` · `CVE-2026-107377` · `PYSEC-2026-4205`
- **State:** Confirmed
- **Severity:** CVSS 7.5 High
- **Critical:** No
- **Weakness (CWE):** [CWE-22](https://cwe.mitre.org/data/definitions/22.html) · [CWE-73](https://cwe.mitre.org/data/definitions/73.html)
- **Tags:** [Path traversal](https://agentprime.io/advisories/tag/path-traversal.md)
- **Published:** 8 Oct 2026
- **Updated:** 15 Oct 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 8 Oct 2026, 17:58 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `datamodel-code-generator` (PyPI): affected `>=0.59.0, <0.81.0`; fixed in `0.81.0`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> datamodel-code-generator versions 0.59.0 up to but not including 0.81.0 can write files outside the intended temporary directory when processing a Protobuf schema with malicious weak-import paths. An attacker who gets a user or CI job to process a crafted .proto file, supplied locally or via --url, can create files and directories where the process has write access and can overwrite existing writable files using relative traversal; written content is limited to a generated proto syntax line. Upgrade to datamodel-code-generator 0.81.0 or later.

Written 1 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 7.5 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0053, the 45th percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:08 UTC: First seen by agentprime
- 31 Oct 2026, 14:08 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-77xj-x4rm-935c)

## Sources

- [GitHub Advisory Database: GHSA-77xj-x4rm-935c](https://github.com/advisories/GHSA-77xj-x4rm-935c)
- [OSV: GHSA-77xj-x4rm-935c](https://osv.dev/vulnerability/GHSA-77xj-x4rm-935c)
- <https://github.com/datamodel-code-generator/datamodel-code-generator/security/advisories/GHSA-77xj-x4rm-935c>
- <https://github.com/datamodel-code-generator/datamodel-code-generator/commit/5e94b8f4203198798ec66b8e48217f70af69a0dc>
- <https://github.com/datamodel-code-generator/datamodel-code-generator>
- <https://github.com/datamodel-code-generator/datamodel-code-generator/releases/tag/0.81.0>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-77xj-x4rm-935c>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-77xj-x4rm-935c/>. Everything for agents: <https://agentprime.io/llms.txt>.