Path Traversal in yard (CVE-2026-49342)
Summary
Path traversal in yard (CVE-2026-49342). Risk of unauthorized operations or information disclosure. Exploitable via adapter.document_root. Mitigation: upgrade to 0.9.44 or later.
Original description
The description as published by the source.
YARD is a documentation generation tool for the Ruby programming language. Prior to version 0.9.44, YARD's static cache lookup reads a request path before the router's path cleanup runs. When a server is configured with a document root, a traversal path such as /../yard-cache-secret.html is joined against that root and can return a readable sibling .html file outside the intended static tree. Version 0.9.44 patches the issue.
Source: NIST National Vulnerability Database NVD GitHub Advisory
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-2026-49342 has been found in yard.
Attackers can target a specific entry point like adapter.document_root over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 5.3/10.
What to do: upgrade yard to 0.9.44 or later.
If unsure, ask your IT team or search "yard CVE-2026-49342" on the vendor's site.
CVE-2026-49342 (yard) — CWE-22 / CVSS v3 5.3
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: adapter.document_root / check_static_cache / final_options / YARD_STATIC_CACHE_PATH_TRAVERSAL
Patched: 0.9.44 — 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 yard. Attackers reach the vulnerable code path via adapter.document_root without authentication.
Check the vendor advisory for the affected versions of yard. Attack surface: adapter.document_root / check_static_cache / final_options / YARD_STATIC_CACHE_PATH_TRAVERSAL.
Severity: Medium (CVSS 5.3/10). Risk of unauthorized operations or information disclosure.
Update to 0.9.44.
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 'yard' . 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 'yard' . | 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
yard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 yard to 0.9.44ステージング環境で 0.9.44 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
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2026-49342 yard
- Ubuntu UBUNTU-CVE-2026-49342 yard
References
- advisory github.com
- advisory nvd.nist.gov
- advisory github.com
- package github.com
- patch github.com
- web github.com