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CVE-2026-47265 high CVSS 7.5

Vulnerability in aiohttp (CVE-2026-47265)

Summary

Vulnerability in aiohttp (CVE-2026-47265). Confidential information can be exposed externally. Exploitable via cookies. Mitigation: upgrade to 3.14.0 or later.

Original description

The description as published by the source.

Summary

Cookies set with the cookies parameter on requests are sent after following a cross-origin redirect.

Impact

If a developer uses the cookies parameter on a per-request basis then sensitive data might be leaked to an attacker if they manage to control a redirect.

Workaround

If unable to upgrade, using a Cookie header in the headers parameter is not vulnerable.

Patch: https://github.com/aio-libs/aiohttp/commit/f54c40851b0d6c4bbdab97ba518a223adda32478

Source: NIST National Vulnerability Database NVD GitHub Advisory

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-2026-47265 has been found in aiohttp.
Attackers can target a specific entry point like cookies over the network to misuse the product.
Confidential information can be exposed externally. CVSS score: 7.5/10.
What to do: upgrade aiohttp to 3.14.0 or later.
If unsure, ask your IT team or search "aiohttp CVE-2026-47265" on the vendor's site.

CVE-2026-47265 (aiohttp) — CWE-346 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: cookies / Cookie / headers
Patched: 3.14.0 — 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.

❓ What is the problem

A vulnerability (CWE-346) exists in aiohttp. Attackers reach the vulnerable code path via cookies without authentication.

📍 Affected scope

Check the vendor advisory for the affected versions of aiohttp. Attack surface: cookies / Cookie / headers.

🔥 Severity

Severity: High (CVSS 7.5/10). Confidential information can be exposed externally.

🔧 How to fix

Update to 3.14.0.

🛡️ 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 'aiohttp' . 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 'aiohttp' . | 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 aiohttp 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 aiohttp to 3.14.0

    ステージング環境で 3.14.0 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。

  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

pip aiohttp
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.14.0"}]}]
PyPI aiohttp
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.14.0"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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