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Vulnerabilities

Security incident · CVE-2026-47265

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python.

Published Jun 2, 2026 · catalog updated Jul 21, 2026 · AIOHTTP is an asynchronous

Check if you run it

No confirmed exploitation is on record for CVE-2026-47265. EPSS is 0.21%. Act only if a listed version of AIOHTTP is an asynchronous is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (AIOHTTP is an asynchronous).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.6
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.21%
Remediation
Advisory link
Affected products
cpe aiohttp/aiohttp

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.14.0, cookies set with the parameter on requests are sent after following a cross-origin redirect. If a developer uses the parameter on a per-request basis then sensitive data might be leaked to an attacker if they manage to control a redirect. Version 3.14.0 patches the issue. If unable to upgrade, using a header in the parameter is not vulnerable.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe aiohttp/aiohttpversion unspecified

How to fix CVE-2026-47265

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-47265. EPSS is 0.21%. Act only if a listed version of AIOHTTP is an asynchronous is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-346. EPSS 0.21%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Jun 2, 2026 · NIST NVD

    Detected

    AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.14.0, cookies set with the parameter on requests are sent after following a cross-origin redirect. If a developer uses the parameter on a per-request basis then sensitive data might be leaked to an attacker if they manage to control a redirect. Version 3.14.0 patches the issue. If unable to upgrade,

  2. Jul 21, 2026 · NIST NVD

    Updated

    AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.14.0, cookies set with the parameter on requests are sent after following a cross-origin redirect. If a developer uses the parameter on a per-request basis then sensitive data might be leaked to an attacker if they manage to control a redirect. Version 3.14.0 patches the issue. If unable to upgrade,

Sources

  • CVE.orgVulnerability recordCVE-2026-47265

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-47265

    30-day exploitation probability 0.2%

    first.org
  • NIST NVDVulnerability recordCVE-2026-47265

    AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.14.0, cookies set with the parameter on requests are sent after following a cross-origin redirect. If a developer uses the parameter on a per-request basis then

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.