Vulnerability in kas (CVE-2026-47191)
Summary
Vulnerability in kas (CVE-2026-47191). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 5.3 or later.
Original description
The description as published by the source.
kas is a setup tool for bitbake based projects. Prior to version 5.3, when relying solely on a git commit ID (SHA-1 or SHA-256) to qualify if a checkout of a repository is equivalent to the state validated while adding its commit ID to a kas configuration, users may be tricked to check out a branch of the same name from this repository. This implies that the referenced repository has been taken over by an attacker and modified to carry such a branch. SHA-1 commits may also be replaced by creating hash collisions, so the primary impact of this issue is on SHA-256 commit IDs. Version 5.3 fixes the issue. As a workaround, avoid relying solely on the commit ID for integrity validation of a repository that might become under control of a malicious 3rd party. If available, additional validate cryptographically signed commits or tags. Alternatively, mirror the repository to a save place, validate its integrity, and use this instead of the original one.
Source: GitHub Security Advisories (Global) 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-2026-47191 has been found in kas.
Risk of unauthorized operations or information disclosure.
What to do: upgrade kas to 5.3 or later.
If unsure, ask your IT team or search "kas CVE-2026-47191" on the vendor's site.
CVE-2026-47191 (kas) — CWE-347
Patched: 5.3 — apply immediately
Workaround: Avoid relying solely on the commit ID for integrity validation of a repository that might become under control of a malicious 3rd party.
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.
A vulnerability (CWE-347) exists in kas.
Check the vendor advisory for the affected versions of kas.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 5.3.
Workaround: Avoid relying solely on the commit ID for integrity validation of a repository that might become under control of a malicious 3rd party.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'kas' . 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 'kas' . | 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
kasを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply temporary workaround mitigate
Avoid relying solely on the commit ID for integrity validation of a repository that might become under control of a malicious 3rd party.パッチが適用されるまでの応急処置として、Avoid relying solely on the commit ID for integrity validation of a repository that might become under control of a malicious 3rd party. を実施。回避策の副作用 (機能低下) を確認した上で。
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3Apply patch patch
Upgrade kas to 5.3ステージング環境で 5.3 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。
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4Post-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-2026-47191 kas
- Ubuntu UBUNTU-CVE-2026-47191 kas
References
- advisory github.com
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov
- package github.com
- patch github.com
- web github.com