Path Traversal in chainlit (CVE-2026-22218)
Summary
Path traversal in chainlit (CVE-2026-22218). Confidential information can be exposed externally. Mitigation: upgrade to 2.9.4 or later.
Original description
The description as published by the source.
Chainlit versions prior to 2.9.4 contain an arbitrary file read vulnerability in the /project/element update flow. An authenticated client can send a custom Element with a user-controlled path value, causing the server to copy the referenced file into the attacker’s session. The resulting element identifier (chainlitKey) can then be used to retrieve the file contents via /project/file/, allowing disclosure of any file readable by the Chainlit service.
Source: NIST National Vulnerability Database NVD
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-2026-22218 has been found in chainlit.
Confidential information can be exposed externally. CVSS score: 6.5/10.
What to do: upgrade chainlit to 2.9.4 or later.
If unsure, ask your IT team or search "chainlit CVE-2026-22218" on the vendor's site.
CVE-2026-22218 (chainlit) — CWE-22 / CVSS v3 6.5
Attack vector: remote (network-reachable) / no user interaction
Patched: 2.9.4 — 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 chainlit.
Check the vendor advisory for the affected versions of chainlit.
Severity: Medium (CVSS 6.5/10). Confidential information can be exposed externally.
Update to 2.9.4.
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 'chainlit' . 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 'chainlit' . | 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
chainlit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 chainlit to 2.9.4ステージング環境で 2.9.4 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 vulncheck.com
- advisory github.com
- advisory nvd.nist.gov
- package github.com
- patch github.com
- report zafran.io