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Fencer Vulns
medium 6.1

CVE-2024-27306 json

aiohttp vulnerable to XSS on index pages for static file handling

published 2024-04-18 2 y ago modified 2026-09-10 1 mo ago also EUVD-2024-1143 , GHSA-7gpw-8wmc-pm8g , PYSEC-2026-1102

cvss
6.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 52%
public exploits
0
none known

Summary

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.

Patch / fix

  • pypi aiohttp 3.9.4
  • aiohttp aiohttp 3.9.4
  • python-aiohttp Debian 14, Debian 13 3.9.5-1

debian advisories DEBIAN-CVE-2024-27306

  • 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
  • python-aiohttp Ubuntu Pro 24.04 LTS 3.9.1-1ubuntu0.1+esm1

ubuntu advisories UBUNTU-CVE-2024-27306

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

  • python-django rhui 4 4.2.15-1.el8ui
  • python-grpcio rhui 4 1.65.4-1.el8ui
  • python-jinja2 rhui 4 3.1.4-1.el8ui
  • python-aiohttp rhui 4 3.9.4-1.el8ui
  • python-gunicorn rhui 4 22.0.0-1.0.1.el8ui
  • python-requests rhui 4 2.32.3-2.el8ui
  • python-sqlparse rhui 4 0.5.0-1.el8ui
  • python3.11-django rhui 4 4.2.15-1.el8ui

red hat advisories RHSA-2025:1335RHSA-2024:3781RHSA-2024:5662

  • python-aiohttp SLE Module for Public Cloud 15 SP6, SLE Module for Public Cloud 15 SP5, SLE Module for Public Cloud 15 SP4 +3 more 3.6.0-150100.3.24.1
  • python-aiohttp SLE Module for Python 3 15 SP6, SLE Module for Python 3 15 SP5, SLE Module for Public Cloud 15 SP4 +2 more 3.9.3-150400.10.21.1

suse advisories SUSE-SU-2024:4396-1SUSE-SU-2024:1866-1

  • python-aiohttp openSUSE Tumbleweed 3.14.3-1.1
  • python-aiohttp openSUSE Tumbleweed 3.9.5-2.1

opensuse advisories openSUSE-SU-2026:11467-1openSUSE-SU-2024:13965-1

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-2024-27306 updated cvss 6.1

aiohttp: XSS on index pages for static file handling

  • Red Hat Ansible Automation Platform 1.2 ansible-tower
    affected: no fix planned “Out of support scope”
  • Red Hat Ansible Automation Platform 2.4 for RHEL 8 python39-aiohttp 3.9.5-1.el8ap, python3x-aiohttp 3.9.5-1.el8ap Red Hat Ansible Automation Platform 2.4 for RHEL 9 python-aiohttp 3.9.5-1.el9ap, python3-aiohttp 3.9.5-1.el9ap
    fixed: vendor fix RHSA-2024:3781
  • Red Hat Satellite 6.15 for RHEL 8 python-aiohttp 3.9.4-1.el8pc, python3.11-aiohttp 3.9.4-1.el8pc
    fixed: vendor fix RHSA-2024:5662
  • Red Hat RHUI 4 for RHEL 8 python-aiohttp 3.9.4-1.el8ui, python3.11-aiohttp 3.9.4-1.el8ui
    fixed: vendor fix RHSA-2025:1335
  • Red Hat Ansible Automation Platform 2 automation-controller, 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/ee-dellemc-openmanage-rhel8, +1 more Red Hat Ansible Automation Platform 2.4 for RHEL 8 receptor 1.4.8-1.el8ap, python39-idna 3.7-1.el8ap, python3x-idna 3.7-1.el8ap, receptorctl 1.4.8-1.el8ap, ansible-core 2.15.11-1.el8ap, ansible-test 2.15.11-1.el8ap, +37 more Red Hat Ansible Automation Platform 2.4 for RHEL 9 receptor 1.4.8-1.el9ap, python-idna 3.7-1.el9ap, python3-idna 3.7-1.el9ap, receptorctl 1.4.8-1.el9ap, python-black 22.8.0-2.el9ap, python-jinja2 3.1.4-1.el9ap, +37 more Red Hat Satellite 6.15 for RHEL 8 libcomps 0.1.21-1.el8pc, foreman 3.9.1.9-1.el8sat, satellite 6.15.3-1.el8sat, python-jinja2 3.1.4-1.el8pc, foreman-cli 3.9.1.9-1.el8sat, foreman-ec2 3.9.1.9-1.el8sat, +31 more Red Hat RHUI 4 for RHEL 8 libcomps 0.1.21-1.el8ui, python-jq 1.6.0-4.el8ui, python-xlrd 2.0.1-9.el8ui, python-xlwt 1.3.0-7.el8ui, python-yarl 1.8.2-5.el8ui, python-zipp 3.4.0-8.el8ui, +196 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
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.67% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
GitHub 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
OSV 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
pypi aiohttp
<3.9.4
3.9.4

Affected products

  • aio-libs aiohttp
  • aiohttp aiohttp

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation
  • CWE-80 Improper Neutralization of Script-Related HTML Tags in a Web Page

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.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.