CVE intelligence and bounded remediation

CVE-2024-27306 — aiohttp is an asynchronous HTTP client/server framework for asyncio and Python

Medium CVSS 6.1

aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. A XSS vulnerability exists on index pages for static file handling. This vulnerability is fixed in 3.9.4. We have always recommended using a reverse proxy server (e.g. nginx) for serving static files. Users following the recommendation are unaffected. Other users can disable `show_index` if unable to upgrade.

Severity
Medium
CVSS
6.1 (3.1)
Published
2024-04-18
CISA KEV
Not currently listed
Ecosystem
python/pypi
Weaknesses
CWE-79, CWE-80

Affected products

  • aiohttp / aiohttp
  • fedoraproject / fedora / 38
  • fedoraproject / fedora / 39
  • fedoraproject / fedora / 40

Matched remediation archetype

Cross-site scripting and unsafe browser output

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

Check exposure

  • Trace reflected, stored, and DOM-derived untrusted values into HTML, attributes, URLs, styles, scripts, and client-side template sinks.
  • Identify affected origins, authenticated user roles, sensitive browser capabilities, and where content is shared across tenants.
  • Review framework escaping, rich-text sanitization, legacy templates, and client-side rendering paths.

Remediate safely

  • Use context-aware framework output encoding and safe DOM APIs; keep untrusted data out of executable contexts.
  • Sanitize intentionally supported markup with a maintained allowlist policy and validate URLs and attributes separately.
  • Update affected rendering components and add tests for every output context using inert sentinel markup.

Authoritative sources

Complete CVE record and remediation plan

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