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Medium

Weblate SSRF: outbound URL guard misses some private ranges

  • Disclosed: 07.07.2026
  • Updated: 11.10.2026 14:18

Impact

Weblate's VCS_RESTRICT_PRIVATE did not properly account for some transitional IPv6 ranges, multicast addresses, or some semi-private IPv4 ranges, which allowed some addresses to bypass private range restrictions.

Patches

Resources

The issue was reported by @tonghuaroot via GitHub, and the same user also provided the initial patch.

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
Python (PyPI) weblate >= 5.15, < 2026.6 2026.6

References

CVSS score 5.9/10
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness (CWE)
CWE-918
Platform
Python (PyPI)
Package
weblate
Disclosed
07.07.2026
Updated
11.10.2026 14:18

Sources and licenses

OSV / GitHub Advisory Database - PYSEC-2026-3416 - PyPA Advisory Database; CC BY 4.0

OSV / GitHub Advisory Database - GHSA-vmfc-9982-2m45 - CC BY 4.0

Vulnerability history: weblate

All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (36) in the archive
Total entries
36
First → latest
03.2017 08.2026
Without a fix
0
Exploited in attacks
0

Severity breakdown

  • Critical 1
  • High 6
  • Medium 22
  • Low 7

Disclosures per year

Severity:
  1. Weblate has IDOR in GroupViewSet that allows authenticated project manager to gain unauthorized read access to any private project
    High · 8.1 CVE-2026-55228 < 2026.7 2026.7
  2. Weblate SSRF: outbound URL guard misses some private ranges this entry
    Medium · 5.9 CVE-2026-50127 >= 5.15, < 2026.6 2026.6
  3. Weblate: Privilege escalation in the user API endpoint
    High · 8.8 CVE-2026-34393 < 5.17 5.17
  4. Weblate: Arbitrary File Read via Symlink
    High · 7.7 CVE-2026-34242 < 5.17 5.17
  5. Weblate: Remote code execution during backup restoration
    High · 8.0 CVE-2026-33435 < 5.17 5.17
  6. Weblate is vulnerable to RCE through Git config file overwrite
    Critical · 9.1 CVE-2025-68398 < 5.15.1 5.15.1
  7. Weblate has an arbitrary file read via symbolic links
    High · 7.7 CVE-2025-68279 < 5.15.1 5.15.1
  8. Weblate is a web based localization tool. Prior to version 5.11, when creating a new component from an existing component that has a source code repository URL specified in settings, this URL is inclu
    High · 7.5 CVE-2025-32021 < 5.11 5.11

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