CVE-2026-34244: Weblate SSRF Vulnerability

MODERATE
Advisory Identifier: GHSA-xrwr-fcw6-fmq8
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CVSS 5.0
CWE-918 CWE-200
Published
Advisory Summary

CVE-2026-34244 is a MODERATE (CVSS 5.0) ssrf vulnerability (CWE-918: Server-Side Request Forgery (SSRF)) affecting Weblate libraries in the PyPI ecosystem. The issue involves ssrf via project-level machinery configuration. Remediation is available by upgrading affected packages to version 5.17.

CVE-2026-34244 at a Glance

CVE Identifier CVE-2026-34244
GHSA Identifier GHSA-xrwr-fcw6-fmq8
Severity MODERATE
CVSS v3.1 Base Score 5.0
CWE Classification CWE-918: Server-Side Request Forgery (SSRF)
Affected Product Weblate
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 5.0

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Changed (S:C)
Confidentiality Low (C:L)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2026-34244

To remediate this vulnerability, upgrade all affected Weblate dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

weblate fixed: 5.17 
pip install weblate>=5.17
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show weblate

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2026-34244, inspect your installed packages using pip:

pip show weblate

Analyze the terminal output to locate any version of Weblate in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 5.17), your application is affected.

Note: The pip show weblate command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-918: Server-Side Request Forgery (SSRF), where the web server receives a url or similar request from an upstream component and retrieves the contents of this url, but it does not sufficiently ensure that the request is being sent to the expected destination. In Weblate, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Impact A user with the `project.edit` permission (granted by the per-project "Administration" role) can configure machine translation service URLs pointing to arbitrary internal network addresses. During configuration validation, Weblate makes an HTTP request to the attacker-controlled URL and reflects up to 200 characters of the response body back to the user in an error message. This constitutes a Server-Side Request Forgery (SSRF) with partial response read. ### Patches * https://github.com/WeblateOrg/weblate/pull/18684 * The solution then has been cleaned up in followup patches ### Workarounds Limiting available machinery services via WEBLATE_MACHINERY setting can avoid this. ### References Thanks to @DavidCarliez for disclosing this via GitHub private vulnerability reporting.

CVE-2026-34244 Affected Weblate Versions

1 component(s)
Fixed Versions:
5.17
Product / Package Ecosystem Affected Versions Fixed Version
weblate
pypi/weblate
PyPI
< 5.17
5.17

References

GitHub Advisory / Wiki ADVISORY
https://github.com/WeblateOrg/weblate/security/advisories/GHSA-xrwr-fcw6-fmq8
NVD — CVE-2026-34244 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-34244
Weblate Source Repository REPOSITORY
https://github.com/WeblateOrg/weblate/pull/18684
Security Fix Commit FIX COMMIT
https://github.com/WeblateOrg/weblate/commit/e619e9090202e4886b844c110d39308e7e882c0e
Weblate Source Repository REPOSITORY
https://github.com/WeblateOrg/weblate

Frequently Asked Questions

What is CVE-2026-34244?
CVE-2026-34244 is a security vulnerability in Weblate involving SSRF via Project-Level Machinery Configuration under CWE-918: Server-Side Request Forgery (SSRF).
Which Weblate versions are affected?
Affected versions include releases prior to 5.17 across affected packages: weblate.
What version fixes CVE-2026-34244?
Upgrading to 5.17 (or the latest patched release for your respective branch) resolves the vulnerability.
Is weblate affected?
Yes, weblate is affected in releases prior to 5.17. Upgrade your dependency to 5.17 or later.
What is the CVSS score of CVE-2026-34244?
CVE-2026-34244 has a CVSS v3.1 base score of 5.0 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N.
What CWE is associated with CVE-2026-34244?
CVE-2026-34244 is classified under CWE-918: Server-Side Request Forgery (SSRF) (The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.).
How can I check PyPI dependencies for CVE-2026-34244?
Run the dependency tree command: 'pip show weblate'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-xrwr-fcw6-fmq8",
  "modified" : "2026-04-16T20:43:38Z",
  "published" : "2026-04-16T20:43:38Z",
  "aliases" : [ "CVE-2026-34244" ],
  "summary" : "Weblate: SSRF via Project-Level Machinery Configuration ",
  "details" : "### Impact\nA user with the `project.edit` permission (granted by the per-project \"Administration\" role) can configure machine translation service URLs pointing to arbitrary internal network addresses. During configuration validation, Weblate makes an HTTP request to the attacker-controlled URL and reflects up to 200 characters of the response body back to the user in an error message. This constitutes a Server-Side Request Forgery (SSRF) with partial response read.\n\n### Patches\n\n* https://github.com/WeblateOrg/weblate/pull/18684\n* The solution then has been cleaned up in followup patches\n\n### Workarounds\nLimiting available machinery services via WEBLATE_MACHINERY setting can avoid this.\n\n### References\n\nThanks to @DavidCarliez for disclosing this via GitHub private vulnerability reporting.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "weblate"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "5.17"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/WeblateOrg/weblate/security/advisories/GHSA-xrwr-fcw6-fmq8"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-34244"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/WeblateOrg/weblate/pull/18684"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/WeblateOrg/weblate/commit/e619e9090202e4886b844c110d39308e7e882c0e"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/WeblateOrg/weblate"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-200", "CWE-918" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-16T20:43:38Z",
    "nvd_published_at" : "2026-04-15T19:16:35Z"
  }
}