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CVE-2025-47774

Vulnerability in vyper (CVE-2025-47774)

Summary

vulnerability in vyper (CVE-2025-47774). Risk of unauthorized operations or information disclosure. Exploitable via ``msg.data``.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **CVE-2025-47774** has been found in vyper. Attackers can target a specific entry point like ``msg.data`` over the network to misuse the product. Risk of unauthorized operations or information disclosure. CVSS score: ?/10. What to do: apply the vendor's official patched release. If unsure, ask your IT team or search "vyper CVE-2025-47774" on the vendor's site.
CVE-2025-47774 (vyper) — CWE-691 / Attack surface: `msg.data` / `make_byte_array_copier` / `start` / `length` Workaround: _Is there a way for users to fix or remediate the vulnerability without upgrading?_ 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-691) exists in vyper. Attackers reach the vulnerable code path via ``msg.data`` without authentication.
📍 Affected scope
vyper — . Attack surface: `msg.data` / `make_byte_array_copier` / `start` / `length`.
🔥 Severity
Severity: ?. Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to the patched release per vendor advisory.
🛡️ Workaround
Workaround: _Is there a way for users to fix or remediate the vulnerability without upgrading?_
🔍 Detection
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run `grep -r 'vyper' .` 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

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

  2. 5
    Apply temporary workaround mitigate 
    _Is there a way for users to fix or remediate the vulnerability without upgrading?_

    パッチが適用されるまでの応急処置として、_Is there a way for users to fix or remediate the vulnerability without upgrading?_ を実施。回避策の副作用 (機能低下) を確認した上で。

  3. 7
    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 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

PyPI vyper
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"0.4.2rc1"}]}]

References

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