# Weblate SSRF: outbound URL guard misses some private ranges

Advisory record · `GHSA-vmfc-9982-2m45`

- **Identifiers:** `GHSA-vmfc-9982-2m45` · `CVE-2026-50127` · `PYSEC-2026-3416`
- **State:** Confirmed
- **Severity:** CVSS 5.9 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-918](https://cwe.mitre.org/data/definitions/918.html)
- **Tags:** [Server-side request forgery (SSRF)](https://agentprime.io/advisories/tag/ssrf.md)
- **Published:** 7 Jul 2026
- **Updated:** 13 Jul 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 7 Jul 2026, 23:46 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `weblate` (PyPI): affected `>=5.15, <2026.6`; fixed in `2026.6`

## Machine-written summary

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

> Weblate versions 5.15 up to but not including 2026.6 are affected. The VCS_RESTRICT_PRIVATE check did not cover some transitional IPv6 ranges, multicast addresses, or certain semi-private IPv4 ranges, so those addresses could bypass the private-range restriction. The source gives few details about the attack conditions or impact. Upgrade to Weblate 2026.6.

Written 6 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0031, the 23rd percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 15:01 UTC: First seen by agentprime
- 31 Oct 2026, 15:01 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-vmfc-9982-2m45)

## Sources

- [GitHub Advisory Database: GHSA-vmfc-9982-2m45](https://github.com/advisories/GHSA-vmfc-9982-2m45)
- [OSV: GHSA-vmfc-9982-2m45](https://osv.dev/vulnerability/GHSA-vmfc-9982-2m45)
- <https://github.com/WeblateOrg/weblate/security/advisories/GHSA-vmfc-9982-2m45>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-50127>
- <https://github.com/WeblateOrg/weblate/pull/19768>
- <https://github.com/WeblateOrg/weblate>
- <https://github.com/WeblateOrg/weblate/releases/tag/weblate-2026.6>

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-vmfc-9982-2m45>, 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-vmfc-9982-2m45/>. Everything for agents: <https://agentprime.io/llms.txt>.