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MEDIUM severity

CVE-2026-50127 — weblate

MEDIUMFix: WeblateOrg/weblate#19768

CVE-2026-50127 is a medium-severity (CVSS 5.9) Server-Side Request Forgery (SSRF) vulnerability in weblate. A fix is available for weblate — see the affected versions and patch details below.

Weblate SSRF: outbound URL guard misses the NAT64 well-known prefix (64:ff9b::/96)

Also known asGHSA-vmfc-9982-2m45PYSEC-2026-3416
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 1, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-50127.

EPSS Exploitation Probability

via FIRST.org ↗
0.3%probability of exploitation in next 30 days
Lower Risk-0.16%
Lower risk than most CVEs24th percentile — riskier than 24% of all scored CVEsHighest risk
0.00%0.32%0.65%0.97%0.3%0.3%0.3%0.5%0.3%Jul 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐍weblate

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

Description

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 Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIweblate≥ 5.15&&< 2026.62026.6pip install --upgrade 'weblate==2026.6'

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for weblate, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update weblate to 2026.6 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-50127 is resolved across your whole dependency graph.

  3. Workarounds

    Restrict outbound requests from the affected component to an allowlist of hosts, block access to link-local and internal address ranges at the network layer, and require authentication on internal services so a forged request cannot reach them unauthenticated.

Frequently Asked Questions

### 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 * https://github.com/WeblateOrg/weblate/pull/19768 ### Resources The issue was reported by @tonghuaroot via GitHub, and the same user also provided the initial patch.
O3 Security · Impact-Aware SCA

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CVE-2026-50127: weblate — Fixed in 2026.6