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CVE-2026-32640 critical CVSS 9.8

Code Injection in simpleeval (CVE-2026-32640)

Summary

Code injection in simpleeval (CVE-2026-32640). Successful exploitation can lead to full system takeover. Exploitable via names. Mitigation: upgrade to 1.0.5 or later.

Original description

The description as published by the source.

Impact

If the objects passed in as names to SimpleEval have modules or other disallowed / dangerous objects available as attrs.
Additionally, dangerous functions or modules could be accessed by passing them as callbacks to other safe functions to call.

Examples (found by @ByamB4):

Any module where non-underscore attribute chains reach os or sys:

  • os.path, pathlib, shutil, glob (direct .os / .sys attributes)
  • statistics (has .sys)
  • numpy (has .ctypeslib.os and .f2py.sys)
  • urllib.parse (has .warnings.sys)

Patches

The latest version 1.0.5 has this issue fixed.

Workarounds

Don't pass in objects or modules which have direct attributes to potentially dangerous items.
Use a wrapper to wrap the potentially vulnerable items (See the ModuleWrapper in version 1.0.5)

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-2026-32640 has been found in simpleeval.
Attackers can target a specific entry point like names over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: 9.8/10.
What to do: upgrade simpleeval to 1.0.5 or later.
If unsure, ask your IT team or search "simpleeval CVE-2026-32640" on the vendor's site.

CVE-2026-32640 (simpleeval) — CWE-94 / CVSS v3 9.8
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: names
Patched: 1.0.5 — 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.

❓ What is the problem

Arbitrary code execution (CWE-94) exists in simpleeval. Attackers reach the vulnerable code path via names without authentication.

📍 Affected scope

Check the vendor advisory for the affected versions of simpleeval. Attack surface: names.

🔥 Severity

Severity: Critical (CVSS 9.8/10). Successful exploitation can lead to full system takeover.

🔧 How to fix

Update to 1.0.5.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'simpleeval' . 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

  1. 1
    Identify exposure identify 
    grep -r 'simpleeval' . | 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 simpleeval を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply patch patch 
    Upgrade simpleeval to 1.0.5

    ステージング環境で 1.0.5 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。

  3. 3
    Post-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

PyPI simpleeval
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.0.5"}]}]
pip simpleeval
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.0.5"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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