CVE-2026-34242: Weblate Arbitrary File Read Vulnerability

HIGH
Advisory Identifier: GHSA-hv99-mxm5-q397
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CVSS 7.7
CWE-59 CWE-200 CWE-22
Published
Advisory Summary

CVE-2026-34242 is a HIGH (CVSS 7.7) arbitrary file read vulnerability (CWE-59: Improper Link Resolution Before File Access ('Link Following')) affecting Weblate libraries in the PyPI ecosystem. The issue involves arbitrary file read via symlink. Remediation is available by upgrading affected packages to version 5.17.

CVE-2026-34242 at a Glance

CVE Identifier CVE-2026-34242
GHSA Identifier GHSA-hv99-mxm5-q397
Severity HIGH
CVSS v3.1 Base Score 7.7
CWE Classification CWE-59: Improper Link Resolution Before File Access ('Link Following')
Affected Product Weblate
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 7.7

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:H/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 High (C:H)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2026-34242

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-2026-34242, 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-59: Improper Link Resolution Before File Access ('Link Following'), where the product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource. 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 The ZIP download feature didn't verify downloaded file and it could follow symlinks outside the repository. ### Patches * https://github.com/WeblateOrg/weblate/pull/18683 ### References Thanks to @DavidCarliez for reporting this vulnerability via GitHub.

CVE-2026-34242 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-hv99-mxm5-q397
NVD — CVE-2026-34242 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-34242
Security Fix Commit FIX COMMIT
https://github.com/WeblateOrg/weblate/commit/5db3a2a2e047ecaab627a8731cd744a30b2f51d3
Weblate Source Repository REPOSITORY
https://github.com/WeblateOrg/weblate

Frequently Asked Questions

What is CVE-2026-34242?
CVE-2026-34242 is a security vulnerability in Weblate involving Arbitrary File Read via Symlink under CWE-59: Improper Link Resolution Before File Access ('Link Following').
Which Weblate versions are affected?
Affected versions include releases prior to 5.17 across affected packages: weblate.
What version fixes CVE-2026-34242?
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-2026-34242?
CVE-2026-34242 has a CVSS v3.1 base score of 7.7 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.
What CWE is associated with CVE-2026-34242?
CVE-2026-34242 is classified under CWE-59: Improper Link Resolution Before File Access ('Link Following') (The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.).
How can I check PyPI dependencies for CVE-2026-34242?
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-hv99-mxm5-q397",
  "modified" : "2026-04-16T20:43:11Z",
  "published" : "2026-04-16T20:43:11Z",
  "aliases" : [ "CVE-2026-34242" ],
  "summary" : "Weblate: Arbitrary File Read via Symlink",
  "details" : "### Impact\n\nThe ZIP download feature didn't verify downloaded file and it could follow symlinks outside the repository.\n\n### Patches\n\n* https://github.com/WeblateOrg/weblate/pull/18683\n\n### References\n\nThanks to @DavidCarliez for reporting this vulnerability via GitHub.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/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-hv99-mxm5-q397"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-34242"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/WeblateOrg/weblate/commit/5db3a2a2e047ecaab627a8731cd744a30b2f51d3"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/WeblateOrg/weblate"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-200", "CWE-22", "CWE-59" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-16T20:43:11Z",
    "nvd_published_at" : "2026-04-15T19:16:35Z"
  }
}