TI-2026-36898 Aliases CVE-2026-50127 GHSA-vmfc-9982-2m45

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

LOW 26CWE-918Published 2026-06-10 · Updated 2026-06-11

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: High
Impact type: Information disclosure
Confidentiality · integrity · availability: High · None · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-918 and the CVSS impact.

Summary

Weblate is a web based localization tool. From version 5.15 to before version 2026.6, 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. This issue has been patched in version 2026.6.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00308 23rd percentileScored 2026-11-07

Fix Fixed weblate (WeblateOrg): 2026.6weblate (PyPI): 2026.6

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
WeblateOrg	weblate	5.15 to before 2026.6	2026.6	Patch available	CNA
—	weblate (PyPI)	5.15 to before 2026.6	2026.6	Patch available	GHSA-vmfc-9982-2m45

weblate VendorWeblateOrg Affected 5.15 to before 2026.6 Fixed in 2026.6 Patch available CNA
weblate (PyPI) Vendor— Affected 5.15 to before 2026.6 Fixed in 2026.6 Patch available GHSA-vmfc-9982-2m45

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:weblate:weblate::::::::	—	—	WeblateOrg

cpe:2.3:a:weblate:weblate:*:*:*:*:*:*:*:* Versions — — ·WeblateOrg

Remediation

Fix · CNA weblate (WeblateOrg) Fixed in 2026.6
Fix · GHSA-vmfc-9982-2m45 weblate (PyPI) Fixed in 2026.6 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-50127
2026-10-03 Alias added: GHSA-vmfc-9982-2m45

References

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-50127

Other 4

TI-2025-23145 Weblate VCS credentials included in URL parameters are potentially logged and saved into browser history as plaintext CVSS 3.1HIGH 7.5
TI-2025-38033 Weblate integration with Anubis can lead to Open Redirect via redir parameter CVSS 4.0LOW 2.1
TI-2022-07893 Remote code execution (RCE) in Weblate CVSS 3.1HIGH 8.8
TI-2025-41967 Weblate has git config file overwrite vulnerability that leads to remote code execution CVSS 3.1CRITICAL 9.1
TI-2026-26679 Weblate: Privilege escalation in the user API endpoint CVSS 3.1HIGH 8.8
TI-2026-19444 Weblate has an argument injection in management console CVSS 3.1CRITICAL 9.1

See all 49 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences