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Fencer Vulns
medium 5.3

CVE-2023-47627 json

Request smuggling in aiohttp

published 2023-11-14 2 y ago modified 2026-09-10 1 mo ago also GHSA-gfw2-4jvh-wgfg , PYSEC-2023-246 , EUVD-2023-0004

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 58%
public exploits
0
none known

Summary

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.

Patch / fix

  • pypi aiohttp 3.8.6
  • aiohttp aiohttp 3.8.6
  • python-aiohttp Debian 12 3.8.4-1+deb12u1
  • python-aiohttp Debian 14, Debian 13 3.8.6-1

debian advisories DEBIAN-CVE-2023-47627

  • python-aiohttp Ubuntu Pro 22.04 LTS 3.8.1-4ubuntu0.2+esm1

ubuntu advisories UBUNTU-CVE-2023-47627

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • foreman satellite utils 6.15, satellite capsule 6.15, satellite 6.15 3.9.1.6-1.el8sat
  • foreman-cli satellite utils 6.15, satellite 6.15 3.9.1.6-1.el8sat
  • foreman-ec2 satellite 6.15 3.9.1.6-1.el8sat
  • foreman-pcp satellite 6.15 3.9.1.6-1.el8sat
  • puppetserver satellite capsule 6.15, satellite 6.15 7.14.0-1.el8sat
  • rubygem-puma satellite 6.15 6.4.2-1.el8sat
  • foreman-ovirt satellite 6.15 3.9.1.6-1.el8sat
  • foreman-redis satellite 6.15 3.9.1.6-1.el8sat

red hat advisories RHSA-2024:2010RHSA-2024:1057RHSA-2024:1640RHSA-2024:1878RHSA-2024:1536

  • python-aiohttp SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE Module for Python 3 15 SP5 +3 more 3.9.3-150400.10.14.1

suse advisories SUSE-SU-2024:0577-1

  • python-aiohttp openSUSE Tumbleweed 3.14.3-1.1
  • python-aiohttp openSUSE Tumbleweed 3.9.0-1.1

opensuse advisories openSUSE-SU-2026:11467-1openSUSE-SU-2024:13465-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-47627 updated cvss 7.5

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

  • Red Hat Ansible Automation Platform 2.4 for RHEL 8 python39-aiohttp 3.9.1-1.el8ap, python3x-aiohttp 3.9.1-1.el8ap, automation-controller-venv-tower 4.5.5-2.el8ap Red Hat Ansible Automation Platform 2.4 for RHEL 9 python-aiohttp 3.9.1-1.el9ap, python3-aiohttp 3.9.1-1.el9ap, automation-controller-venv-tower 4.5.5-2.el9ap
    fixed: vendor fix RHSA-2024:1640
  • Red Hat Satellite 6.14 for RHEL 8 python-aiohttp 3.9.2-0.1.el8pc, python39-aiohttp 3.9.2-0.1.el8pc
    fixed: vendor fix RHSA-2024:1536
  • Red Hat Satellite 6.15 for RHEL 8 python-aiohttp 3.9.2-1.el8pc, python3.11-aiohttp 3.9.2-1.el8pc
    fixed: vendor fix RHSA-2024:2010
  • Red Hat RHUI 4 for RHEL 8 python-aiohttp 3.9.2-1.el8ui, python3.11-aiohttp 3.9.2-1.el8ui
    fixed: vendor fix RHSA-2024:1878
  • Red Hat Ansible Automation Platform 1.2 ansible-tower Red Hat Ansible Automation Platform 2 ansible-automation-platform-25/ee-minimal-rhel8, ansible-automation-platform-24/ee-supported-rhel9, ansible-automation-platform-24/ansible-builder-rhel9, ansible-automation-platform-25/ee-cloud-services-rhel9, ansible-automation-platform-24/platform-resource-runner-rhel8 Red Hat Ansible Automation Platform 2.4 for RHEL 8 receptor 1.4.5-1.el8ap, receptorctl 1.4.5-1.el8ap, ansible-core 2.15.10-1.el8ap, ansible-runner 2.3.5-1.el8ap, ansible-runner 2.3.6-1.el8ap, ansible-test 2.15.10-1.el8ap, +119 more Red Hat Ansible Automation Platform 2.4 for RHEL 9 receptor 1.4.5-1.el9ap, receptorctl 1.4.5-1.el9ap, python-jinja2 3.1.3-1.el9ap, ansible-core 2.15.10-1.el9ap, ansible-runner 2.3.5-1.el9ap, ansible-runner 2.3.6-1.el9ap, +119 more Red Hat Satellite 6.14 for RHEL 8 candlepin 4.3.12-1.el8sat, satellite 6.14.3-1.el8sat, python-django 3.2.22-1.el8pc, python-flake8 5.0.0-0.1.el8pc, python-jinja2 3.1.3-0.1.el8pc, python-mccabe 0.7.0-0.1.el8pc, +27 more Red Hat Satellite 6.15 for RHEL 8 cjson 1.7.14-5.el8sat, libsolv 0.7.22-6.el8pc, katello 4.11.0-1.el8sat, libcomps 0.1.18-8.el8pc, python-jq 1.6.0-3.el8pc, foreman 3.9.1.6-1.el8sat, +677 more
    +1 more products
    Red Hat RHUI 4 for RHEL 8 libsolv 0.7.22-6.el8ui, libcomps 0.1.18-8.el8ui, python-jq 1.6.0-3.el8ui, python-xlrd 2.0.1-8.el8ui, python-xlwt 1.3.0-6.el8ui, python-yarl 1.8.2-4.el8ui, +201 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.86% chance of exploitation in the next 30 days, higher than 58% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/aio-libs/aiohttp/security/advisories/GHSA-gfw2-4jvh-wgfg referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
GitHub 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected packages

ecosystem package affected fixed in
pypi aiohttp
<3.8.6
3.8.6

Affected products

  • aio-libs aiohttp

Classification

Weakness
  • CWE-444 Inconsistent Interpretation of HTTP Requests

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.