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CVE-2026-44511
high
CVSS 7.4
Vulnerability in katalyst-koi (CVE-2026-44511)
Summary
vulnerability in katalyst-koi (CVE-2026-44511). Confidential information can be exposed externally. Mitigation: upgrade to `5.6.0` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-44511** has been found in katalyst-koi.
Confidential information can be exposed externally. CVSS score: 7.4/10.
What to do: upgrade katalyst-koi to **5.6.0** or later.
If unsure, ask your IT team or search "katalyst-koi CVE-2026-44511" on the vendor's site.
CVE-2026-44511 (katalyst-koi) — CWE-613 / CVSS v3 7.4
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: `5.6.0` — apply immediately
Workaround: Katalyst Koi recommends upgrading to the latest available version, or back porting the changes released in 5.6.0/4.20.0
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.
❓ What is the problem
**A vulnerability** (CWE-613) exists in katalyst-koi.
📍 Affected scope
katalyst-koi — .
🔥 Severity
Severity: High (CVSS 7.4/10). Confidential information can be exposed externally
🔧 How to fix
Update to **5.6.0**.
🛡️ Workaround
Workaround: Katalyst Koi recommends upgrading to the latest available version, or back porting the changes released in 5.6.0/4.20.0
🔍 Detection
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run `grep -r 'katalyst-koi' .` against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response Actions (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'katalyst-koi' . | 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 `katalyst-koi` を grep し、稼働しているサービス・バージョンを把握する。
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5Apply temporary workaround mitigate
Katalyst Koi recommends upgrading to the latest available version, or back porting the changes released in 5.6.0/4.20.0パッチが適用されるまでの応急処置として、Katalyst Koi recommends upgrading to the latest available version, or back porting the changes released in 5.6.0/4.20.0 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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6Apply patch patch
Upgrade katalyst-koi to 5.6.0ステージング環境で 5.6.0 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と、Step 3 で見つけた異常検知の続報チェックを含めること。
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7Post-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 Step 3 と同じログクエリでアラート再発が無いか継続監視。
Affected packages
rubygems
katalyst-koi
[{"type":"ECOSYSTEM","events":[{"introduced":"5.0.0"},{"fixed":"5.6.0"}]}]
References
- advisory https://nvd.nist.gov/vuln/detail/CVE-2026-44511
- package https://github.com/katalyst/koi
- web https://github.com/katalyst/koi/security/advisories/GHSA-4cx3-3c38-j9vv
- web https://guides.rubyonrails.org/v5.2.0/security.html#replay-attacks-for-cookiestore-sessions
- web https://github.com/advisories/GHSA-4cx3-3c38-j9vv
- web https://github.com/rubysec/ruby-advisory-db/blob/master/gems/katalyst-koi/CVE-2026-44511.yml