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Fencer Vulns
high 7.2

CVE-2023-49081 json

aiohttp's ClientSession is vulnerable to CRLF injection via version

published 2023-11-27 2 y ago modified 2026-09-10 1 mo ago also GHSA-q3qx-c6g2-7pw2 , PYSEC-2023-250 , EUVD-2023-0006

cvss
7.2
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 59%
public exploits
0
none known

Summary

aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. Improper validation made it possible for an attacker to modify the HTTP request (e.g. to insert a new header) or create a new HTTP request if the attacker controls the HTTP version. The vulnerability only occurs if the attacker can control the HTTP version of the request. This issue has been patched in version 3.9.0.

Patch / fix

  • pypi aiohttp 3.9.0
  • aiohttp aiohttp 3.9.0
  • python-aiohttp Debian 12 3.8.4-1+deb12u1
  • python-aiohttp Debian 14, Debian 13 3.9.1-1

debian advisories DEBIAN-CVE-2023-49081

  • python-aiohttp Ubuntu Pro 18.04 LTS 3.0.1-1ubuntu0.1~esm5
  • python-aiohttp Ubuntu Pro 22.04 LTS 3.8.1-4ubuntu0.2+esm1

ubuntu advisories UBUNTU-CVE-2023-49081

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-2024:1878RHSA-2024:1536

  • python-aiohttp SLE Module for Public Cloud 15 SP5, SLE Module for Public Cloud 15 SP4, SLE Module for Public Cloud 15 SP3 +3 more 3.6.0-150100.3.15.1
  • python-aiohttp SLE Module for Python 3 15 SP5, openSUSE Leap 15.5 3.8.5-150400.10.8.1

suse advisories SUSE-SU-2024:0034-1SUSE-SU-2024:0033-1

  • python-aiohttp openSUSE Tumbleweed 3.14.3-1.1
  • python-aiohttp openSUSE Tumbleweed 3.9.3-2.1

opensuse advisories openSUSE-SU-2026:11467-1openSUSE-SU-2024:13691-1

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-2023-49081 updated cvss 5.8

aiohttp: HTTP request modification

  • Red Hat Ansible Automation Platform 1.2 aiohttp
    affected: no fix planned “Will not fix”
  • Red Hat Satellite 6 tfm-pulpcore-python-aiohttp
    affected: no fix planned “Out of support scope”
  • Red Hat Ansible Automation Platform 2.4 for RHEL 8 python39-aiohttp 3.9.1-1.el8ap, python3x-aiohttp 3.9.1-1.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
    fixed: vendor fix RHSA-2024:1057
  • 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 2.4 for RHEL 8 ansible-runner 2.3.5-1.el8ap, automation-hub 4.9.1-1.el8ap, ansible-builder 3.0.1-1.el8ap, ansible-dev-tools 2.4-1.el8ap, python39-jinja2 3.1.3-1.el8ap, python3x-jinja2 3.1.3-1.el8ap, +103 more Red Hat Ansible Automation Platform 2.4 for RHEL 9 python-jinja2 3.1.3-1.el9ap, ansible-runner 2.3.5-1.el9ap, automation-hub 4.9.1-1.el9ap, python-boto3 1.18.35-4.el9ap, python-django 4.2.10-1.el9ap, python-grpcio 1.58.0-3.el9ap, +103 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 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
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.88% chance of exploitation in the next 30 days, higher than 59% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/aio-libs/aiohttp/security/advisories/GHSA-q3qx-c6g2-7pw2 referenced PoC, tagged "exploit" by a source, unverified
  • gist.github.com https://gist.github.com/jnovikov/184afb593d9c2114d77f508e0ccd508e referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 7.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
NVD 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 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
GitHub 3.1 7.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
pypi aiohttp
<3.9.0
3.9.0

Affected products

  • aio-libs aiohttp

Classification

Weakness
  • CWE-20 Improper Input Validation

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.