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HIGH

CVE-2023-47627

CVSS v3

7.5

HIGH

EPSS Score

0.9 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • aiohttpPyPIall versions · fixed in 3.8.6

Vendor advisories

  • CVE-2023-47627 Red Hat Product Security46 products fixed

    python-aiohttp: numerous issues in HTTP parser with header parsing

  • RHSA-2024:2010 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Satellite 6.15.0 release

  • RHSA-2024:1878 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: RHUI 4.8 Release - Security Updates, Bug Fixes, and Enhancements

  • RHSA-2024:1640 Red Hat Product Security8 products fixed

    Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.4 Product Security and Bug Fix Update

  • RHSA-2024:1536 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Satellite 6.14.3 Async Security Update

  • RHSA-2024:1057 Red Hat Product Security26 products fixed

    Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.4 Product Security and Bug Fix Update

Full record on NVD

Description

aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. The HTTP parser in AIOHTTP has numerous problems with header parsing, which could lead to request smuggling. This parser is only used when AIOHTTP_NO_EXTENSIONS is enabled (or not using a prebuilt wheel). These bugs have been addressed in commit `d5c12ba89` which has been included in release version 3.8.6. Users are advised to upgrade. There are no known workarounds for these issues.

Technical details

Published
2023-11-14

Frequently asked questions

What is CVE-2023-47627?

aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. The HTTP parser in AIOHTTP has numerous problems with header parsing, which could lead to request smuggling. This parser is only used when AIOHTTP_NO_EXTENSIONS is enabled (or not using a prebuilt wheel). These bugs have been addressed in commit `d5c12ba89` which has been included in release version 3.8.6. Users are advised to upgrade. There are no known workarounds for these issues.

Is CVE-2023-47627 actively exploited?

Active exploitation of CVE-2023-47627 has not been confirmed. Its EPSS score was 0.9% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2023-47627?

CVE-2023-47627 has a CVSS v3 base score of 7.5 (HIGH severity).

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