What is CVE-2026-86035?

CVE-2026-86035 is a high-severity vulnerability in Weblateorg Weblate, classified under OS Command Injection. CVSS score: 8.5/10. Published 2026-09-29.

How severe is CVE-2026-86035?

High severity. CVSS v3 base score is 8.5 out of 10.

RCE in Weblateorg Weblate

CVE-2026-86035

Weblate is a web-based continuous localization platform used to manage software translations. Weblate 4.11.1 through 2026.7.1 contains an argument-injection vulnerability in its Mercurial backend. Repository filenames beginning with - could be interpreted as Mercurial options instead of literal paths. An authenticated user with project-scoped component.edit permission could exploit this through a Mercurial-backed RESX component using the Update RESX files add-on. A later repository update could execute arbitrary commands with the privileges of the Weblate service account. This is a residual incomplete fix for CVE-2022-23915. This issue has been patched in version 2026.8.

Vulnerability class: Command Injection (OS Command Injection)

Published 2026-09-29.

CVSS v3 metric

CVSS v3 base score 8.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weblateorg Weblate — versions >= 4.11.1, < 2026.8

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-86035?: CVE-2026-86035 is a high-severity vulnerability in Weblateorg Weblate, classified under OS Command Injection. CVSS score: 8.5/10. Published 2026-09-29.
How severe is CVE-2026-86035?: High severity. CVSS v3 base score is 8.5 out of 10.