How severe is CVE-2026-40256?

CVE-2026-40256 has a CVSS 3.x base score of 5.0, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-40256 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-40256?

CVE-2026-40256 affects Weblate. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-40256?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-40256 have an EU (EUVD) identifier?

Yes. CVE-2026-40256 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-23019.

When was CVE-2026-40256 published?

CVE-2026-40256 was published on 2026-04-15 and last updated on 2026-06-17.

CVE-2026-40256

CVE-2026-40256 is a medium-severity vulnerability in Weblate with a CVSS 3.x base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-22.

Key facts

Severity: Medium (CVSS 3.x base score 5.0)
EPSS exploit prediction: 0% (24th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-23019
Weakness: CWE-22
Affected product: Weblate
Published: 2026-04-15
Last modified: 2026-06-17

Description

Weblate is a web based localization tool. In versions prior to 5.17, repository-boundary validation relies on string prefix checks on resolved absolute paths. In multiple code paths, the check uses startswith against the repository root path. This is not path-segment aware and can be bypassed when the external path shares the same string prefix as the repository path (for example, repo and repo_outside). This issue has been fixed in version 5.17.

Frequently asked questions

What is CVE-2026-40256?: Weblate is a web based localization tool. In versions prior to 5.17, repository-boundary validation relies on string prefix checks on resolved absolute paths. In multiple code paths, the check uses startswith against the repository root path. This is not path-segment aware and can be bypassed when the external path shares the same string prefix as the repository path (for example, repo and repo_outside). This issue has been fixed in version 5.17.
How severe is CVE-2026-40256?: CVE-2026-40256 has a CVSS 3.x base score of 5.0, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-40256 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-40256?: CVE-2026-40256 affects Weblate. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-40256?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-40256 have an EU (EUVD) identifier?: Yes. CVE-2026-40256 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-23019.
When was CVE-2026-40256 published?: CVE-2026-40256 was published on 2026-04-15 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:weblate:weblate:*:*:*:*:*:*:*:*

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