CVE-2026-62326 WeblateOrg CVE debrief

Who should care

Defenders responsible for Weblate instances, particularly those with untrusted users, should assess exposure and apply the fix to prevent potential denial of service. This includes verifying the version of Weblate in use, restricting roles to trusted users, and monitoring for suspicious activity. Security teams and platform administrators should prioritize this vulnerability due to its potential for significant operational impact.

Why it matters

A vulnerability in Weblate allows a user to store a malicious regular expression, potentially leading to denial of service. Defenders should prioritize verifying exposure and applying the fix.

• Potential denial of service through sustained CPU-bound requests.
• Verification of exposure and application of the fix is necessary to prevent exploitation.
• Monitoring Weblate instance for suspicious activity is recommended.

Technical summary

A user with the built-in 'Edit source' role can store a malicious regular expression in a source string's flags, potentially leading to denial of service. The issue is fixed in version 2026.7. This vulnerability allows for sustained CPU-bound denial of service through a single edit triggering re-runs of regex checks across linked target units. Weblate instances with untrusted users are particularly at risk. Defenders should prioritize verifying exposure and applying the fix to prevent exploitation. The vulnerability's technical impact is significant due to its potential for CPU exhaustion.

Defensive priority

Defenders should prioritize verifying exposure and applying the fix, as a single edit can trigger sustained CPU-bound denial of service.

Recommended defensive actions

• Verify if the Weblate instance is running a version prior to 2026.7 and update to 2026.7 or later if necessary.
• Restrict the 'Edit source' role to trusted users to prevent exploitation.
• Monitor Weblate instance for suspicious activity, such as unusual request patterns or high CPU usage.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its description, CVSS score, and affected versions. Weblate instances with untrusted users should verify exposure and apply the fix. Evidence is limited to public CVE and NVD records. No additional information is available on exploitation or affected deployments.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.