Unsafe Deserialization in parlai (CVE-2021-24040)
Summary
Vulnerability in parlai (CVE-2021-24040). Successful exploitation can lead to full system takeover. Mitigation: upgrade to 1.1.0 or later.
Original description
The description as published by the source.
Due to use of unsafe YAML deserialization logic, an attacker with the ability to modify local YAML configuration files could provide malicious input, resulting in remote code execution or similar risks. This issue affects ParlAI prior to v1.1.0.
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-2021-24040 has been found in parlai.
Successful exploitation can lead to full system takeover.
What to do: upgrade parlai to 1.1.0 or later.
If unsure, ask your IT team or search "parlai CVE-2021-24040" on the vendor's site.
CVE-2021-24040 (parlai) — CWE-502
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 1.1.0 — 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.
Unsafe deserialization (CWE-502) exists in parlai.
Check the vendor advisory for the affected versions of parlai.
Severity: ?. Successful exploitation can lead to full system takeover.
Update to 1.1.0.
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 'parlai' . 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 'parlai' . | 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
parlai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 parlai to 1.1.0ステージング環境で 1.1.0 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
- advisory github.com
- advisory github.com
- package github.com
- patch github.com
- patch github.com
- patch github.com
- report packetstormsecurity.com
- web github.com
- web github.com