Path Traversal in weblate (CVE-2026-40256)
Summary
Path traversal in weblate (CVE-2026-40256). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 5.17 or later.
Original description
The description as published by the source.
Impact
Weblate 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).
Patches
References
Thanks to m9nx4u for reporting this issue via HackerOne.
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-40256 has been found in weblate.
Risk of unauthorized operations or information disclosure.
What to do: upgrade weblate to 5.17 or later.
If unsure, ask your IT team or search "weblate CVE-2026-40256" on the vendor's site.
CVE-2026-40256 (weblate) — CWE-22
Attack vector: remote (network-reachable) / no user interaction
Patched: 5.17 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
Path traversal (CWE-22) exists in weblate.
Check the vendor advisory for the affected versions of weblate.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 5.17.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'weblate' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'weblate' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
weblateを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade weblate to 5.17ステージング環境で 5.17 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory nvd.nist.gov
- package github.com
- web github.com
- web github.com
- web github.com