GHSA-hfpv-mc5v-p9mm

Suggest an improvement
Source
https://github.com/advisories/GHSA-hfpv-mc5v-p9mm
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-hfpv-mc5v-p9mm/GHSA-hfpv-mc5v-p9mm.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-hfpv-mc5v-p9mm
Aliases
Published
2026-05-26T16:41:13Z
Modified
2026-05-26T16:45:09.836676227Z
Severity
  • 5.0 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N CVSS Calculator
Summary
Weblate has a Server-Side Request Forgery issue
Details

Impact

The Create Component functionality in Weblate allows authorized users to add new translation components by specifying both a version control system and a source code repository URL to pull from. However, the repository URL field is not validated or sanitized, allowing an attacker to supply arbitrary protocols, hostnames, and IP addresses, including localhost, internal network addresses, and local filenames.

When the Mercurial version control system is selected, Weblate exposes the full server-side HTTP response for the provided URL. This effectively creates a server-side request forgery (SSRF) primitive that can probe internal services and return their contents. In addition to accessing internal HTTP endpoints, the behavior also enables local file enumeration by attempting file:// requests. While file contents may not always be returned, the application’s error messages clearly differentiate between files that exist and files that do not, revealing information about the server’s filesystem layout.

In cloud environments, this behavior is particularly dangerous, as internal-only endpoints such as cloud metadata services may be accessible, potentially leading to credential disclosure and full environment compromise.

Patches

This has been addressed in the Weblate 5.15 release.

  • https://github.com/WeblateOrg/weblate/pull/17103
  • https://github.com/WeblateOrg/weblate/pull/17102

Workarounds

Removing Mercurial from VCS_BACKENDS avoids this vulnerability, as the Git backend is not affected. The Git backend was already configured to block the file protocol and does not expose the HTTP response content in the error message.

References

Thanks to Jason Marcello for responsible disclosure.

Database specific 
{
    "nvd_published_at": "2025-12-16T00:16:02Z",
    "severity": "MODERATE",
    "github_reviewed": true,
    "cwe_ids": [
        "CWE-352",
        "CWE-918"
    ],
    "github_reviewed_at": "2026-05-26T16:41:13Z"
}
References

Affected packages

PyPI / weblate

Package

Name
weblate
View open source insights on deps.dev
Purl
pkg:pypi/weblate

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.15

Affected versions

1.*
1.9
2.*
2.0
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
2.10
2.10.1
2.11
2.12
2.13
2.13.1
2.14
2.14.1
2.15
2.16
2.17
2.17.1
2.18
2.19
2.19.1
2.20
3.*
3.0
3.0.1
3.1
3.1.1
3.2
3.2.1
3.2.2
3.3
3.4
3.5
3.5.1
3.6
3.6.1
3.7
3.7.1
3.8
3.9
3.9.1
3.10
3.10.1
3.10.2
3.10.3
3.11
3.11.1
3.11.2
3.11.3
4.*
4.0
4.0.1
4.0.2
4.0.3
4.0.4
4.1
4.1.1
4.2
4.2.1
4.2.2
4.3
4.3.1
4.3.2
4.4
4.4.1
4.4.2
4.5
4.5.1
4.5.2
4.5.3
4.6
4.6.1
4.6.2
4.7
4.7.1
4.7.2
4.8
4.8.1
4.9
4.9.1
4.10
4.10.1
4.11
4.11.1
4.11.2
4.12
4.12.1
4.12.2
4.13
4.13.1
4.14
4.14.1
4.14.2
4.15
4.15.1
4.15.2
4.16
4.16.1
4.16.2
4.16.3
4.16.4
4.17
4.18
4.18.1
4.18.2
5.*
5.0
5.0.1
5.0.2
5.1
5.1.1
5.2
5.2.1
5.3
5.3.1
5.4
5.4.1
5.4.2
5.4.3
5.5
5.5.2
5.5.3
5.5.4
5.5.5
5.6
5.6.1
5.6.2
5.7
5.7.1
5.7.2
5.8.1
5.8.2
5.8.3
5.8.4
5.9.1
5.9.2
5.10
5.10.1
5.10.2
5.10.3
5.10.4
5.11
5.11.1
5.11.3
5.11.4
5.12.1
5.12.2
5.13
5.13.1
5.13.2
5.13.3
5.14
5.14.1
5.14.2
5.14.3

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-hfpv-mc5v-p9mm/GHSA-hfpv-mc5v-p9mm.json"