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Fencer Vulns
medium 6.3

CVE-2026-69243 json

AIOHTTP: HTTP request smuggling via WebSocket upgrade

published 2026-08-03 3 mo ago modified 2026-10-23 16 d ago also GHSA-mfx4-hv73-q22v , PYSEC-2026-3546 , EUVD-2026-52436

cvss
6.3
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 38%
public exploits
0
none known

Summary

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the HTTP parsers were vulnerable to a request smuggling attack relating to WebSocket upgrades. If using the server-side component, an attacker may be able to execute a request smuggling vulnerability using an edge case in the WebSocket upgrade procedure. A WebSocket upgrade request with a body could cause the parser to switch protocols before the complete request body was received, leaving trailing bytes to be handled as upgraded-protocol or pipelined data rather than normal HTTP body data. This issue is fixed in version 3.14.2.

Patch / fix

  • pypi aiohttp 3.14.2
  • python-aiohttp Debian 12 3.8.4-1+deb12u2
  • python-aiohttp Debian 14 3.14.3-1

debian advisories DEBIAN-CVE-2026-69243

  • rubygem-jwt satellite utils 6.19, satellite utils 6.18, satellite utils 6.17 +9 more 2.10.3-1.el9sat
  • ansible-core satellite maintenance 6.19, satellite maintenance 6.18, satellite maintenance 6.17 +6 more 1:2.16.19-1.el9sat
  • ansible-test satellite capsule 6.19, satellite capsule 6.18, satellite capsule 6.17 +3 more 1:2.16.19-1.el9sat
  • openvox-server satellite capsule 6.19, satellite capsule 6.18, satellite capsule 6.17 +5 more 8.15.2-1.el9sat
  • python-aiohttp satellite capsule 6.17, satellite capsule 6.16, satellite 6.17 +1 more 3.14.3-1.el9pc
  • python3.11-aiohttp satellite capsule 6.17, satellite capsule 6.16, satellite 6.17 +1 more 3.14.3-1.el9pc
  • python3.12-aiohttp satellite capsule 6.19, satellite capsule 6.18, satellite 6.19 +1 more 3.14.3-1.el9pc
  • python3.12-gitpython satellite capsule 6.19, satellite 6.19 3.1.59-1.el9pc

red hat advisories RHSA-2026:63387RHSA-2026:63385RHSA-2026:63386RHSA-2026:63327RHSA-2026:59135RHSA-2026:59136

  • python-aiohttp SLE Module for Public Cloud 15 SP7, SLE Module for Public Cloud 15 SP6, SLE Module for Public Cloud 15 SP5 +1 more 3.6.0-150100.3.41.1
  • python-aiohttp SLE Module for Python 3 15 SP7, SLE Module for Public Cloud 15 SP4 3.9.3-150400.10.46.1
  • python-aiohttp SLES for SAP applications 16.0, SLES 16.0 3.11.16-160000.7.1

suse advisories SUSE-SU-2026:4113-1SUSE-SU-2026:4031-1SUSE-SU-2026:23571-1

  • python-aiohttp openSUSE Leap 16.0 3.11.16-160000.7.1
  • python-aiohttp openSUSE Tumbleweed 3.14.3-1.1

opensuse advisories openSUSE-SU-2026:21687-1openSUSE-SU-2026:11467-1

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-2026-69243 updated cvss 7.0

aiohttp: AIOHTTP: HTTP Request Smuggling via WebSocket Upgrade

  • Red Hat Exploit Intelligence exploit-intelligence/vulnerability-analysis-rhel9, exploit-intelligence-tech-preview/vulnerability-analysis-rhel9
    affected: no fix planned “Out of support scope”
  • Red Hat Lightspeed Core lightspeed-core/rag-tool-cpu-rhel9, lightspeed-core/lightspeed-stack-rhel9, lightspeed-core/rag-tool-cuda-12.9-rhel9 Red Hat Migration Toolkit for Applications 8 mta/mta-solution-server-rhel9 Red Hat OpenShift Lightspeed openshift-lightspeed/lightspeed-service-api-rhel9, openshift-lightspeed/lightspeed-agentic-sandbox-rhel9
    affected: no fix available
  • Red Hat AI Inference Server rhaii/vllm-tpu-rhel9, rhaiis/vllm-cpu-rhel9, rhaiis/vllm-tpu-rhel9, rhaii/vllm-gaudi-rhel9, rhaii/vllm-neuron-rhel9, rhaiis/vllm-neuron-rhel9, +1 more
    affected: no fix available, no fix planned “Will not fix”
  • Red Hat Ansible Automation Platform 2 python-aiohttp 3.9.5-1.el9ap, python3x-aiohttp 3.9.5-1.el8ap, python3.11-aiohttp 3.9.5-1.el9ap, ansible-automation-platform-24/hub-rhel8, ansible-automation-platform-25/hub-rhel8, ansible-automation-platform-24/controller-rhel8, +20 more
    affected: no fix available, no fix planned “Out of support scope”
  • Red Hat Ansible Automation Platform Ansible Core 2 ansible-automation-platform/ee-minimal-rhel8, ansible-automation-platform/ee-minimal-rhel9, ansible-automation-platform-tech-preview/ee-minimal-rhel8, ansible-automation-platform-tech-preview/ee-minimal-rhel9
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AI (RHEL AI) 3 rhelai3/bootc-gaudi-rhel9
    affected: no fix planned “Will not fix”
  • Red Hat OpenShift AI (RHOAI) rhai/guidellm-rhel9, rhoai/odh-mlflow-rhel9, rhoai/odh-vllm-gaudi-rhel9, rhoai/odh-llm-d-kv-cache-rhel9, rhoai/odh-openvino-model-server-rhel9, rhoai/odh-th06-cpu-torch291-py312-rhel9, +3 more Red Hat Satellite 6 python-aiohttp, python3-aiohttp
    affected: no fix available
  • Red Hat Update Infrastructure 4 for Cloud Providers python-aiohttp 3.9.5-1.el9ap
    affected: no fix planned “Out of support scope”
show 23 more
  • Red Hat Update Infrastructure 5 rhui5/rhua-rhel9, rhui5/rhua-tp-rhel9
    affected: no fix available, no fix planned “Will not fix”
  • Red Hat AI Inference Server 3.2 rhaiis/vllm-cuda-rhel9 1790621718, rhaiis/vllm-rocm-rhel9 1790621713, rhaiis/model-opt-cuda-rhel9 1790621714
    fixed: vendor fix RHSA-2026:73859
  • Red Hat AI Inference Server 3.3 rhaiis/vllm-cuda-rhel9 1789582776, rhaiis/vllm-rocm-rhel9 1789504371, rhaiis/vllm-spyre-rhel9 1789502493, rhaiis/model-opt-cuda-rhel9 1789508287
    fixed: vendor fix RHSA-2026:68696
  • Red Hat AI Inference Server 3.4 rhaii/vllm-cpu-rhel9 1790075793, rhaii/vllm-cuda-rhel9 1790090131, rhaii/vllm-rocm-rhel9 1790109620, rhaii/vllm-spyre-rhel9 1790076141
    fixed: vendor fix RHSA-2026:70965
  • Red Hat Ansible Automation Platform 2.5 for RHEL 8 python3.12-aiohttp 3.14.3-1.el8ap Red Hat Ansible Automation Platform 2.5 for RHEL 9 python3.12-aiohttp 3.14.3-1.el9ap
    fixed: vendor fix RHSA-2026:59135
  • Red Hat Ansible Automation Platform 2.6 ansible-automation-platform-26/hub-rhel9 1787220598, ansible-automation-platform-26/lightspeed-rhel9 1787244079, ansible-automation-platform-26/ee-supported-rhel9 1787217357, ansible-automation-platform-26/platform-resource-runner-rhel9 1791908620
    fixed: vendor fix RHSA-2026:59155
  • Red Hat Ansible Automation Platform 2.6 for RHEL 9 python3.12-aiohttp 3.14.3-1.el9ap, automation-controller-venv-tower 4.7.16-1.el9ap
    fixed: vendor fix RHSA-2026:59136
  • Red Hat Ansible Automation Platform 2.7 ansible-automation-platform-27/hub-rhel9 1788918708, ansible-automation-platform-27/ee-minimal-rhel9 1787217391, ansible-automation-platform-27/lightspeed-rhel9 1787217531, ansible-automation-platform-27/ee-supported-rhel9 1787235693, ansible-automation-platform-27/platform-resource-runner-rhel9 1791219413
    fixed: vendor fix RHSA-2026:59153
  • Red Hat Discovery 2 discovery/discovery-server-rhel9 1786638573
    fixed: vendor fix RHSA-2026:54760
  • Red Hat Enterprise Linux AI 3.3 rhelai3/bootc-cuda-rhel9 1790866732, rhelai3/bootc-rocm-rhel9 1790791893, rhelai3/bootc-aws-cuda-rhel9 1790936334, rhelai3/bootc-gcp-cuda-rhel9 1790936334, rhelai3/disk-image-cuda-rhel9 1790954179, rhelai3/bootc-azure-cuda-rhel9 1790936351, +1 more
    fixed: vendor fix RHSA-2026:76041
  • Red Hat Enterprise Linux AI 3.4 rhelai3/bootc-cuda-rhel9 1790868254, rhelai3/bootc-rocm-rhel9 1790614447, rhelai3/bootc-aws-cuda-rhel9 1790881122, rhelai3/bootc-gcp-cuda-rhel9 1790881123, rhelai3/disk-image-cuda-rhel9 1790957417, rhelai3/bootc-azure-cuda-rhel9 1790881120, +1 more
    fixed: vendor fix RHSA-2026:76150
  • Red Hat OpenShift AI 2.25 rhoai/odh-ta-lmes-job-rhel9 1787330903, rhoai/odh-feature-server-rhel9 1792148523, rhoai/odh-caikit-tgis-serving-rhel9 1787060100, rhoai/odh-kserve-storage-initializer-rhel9 1791257289, rhoai/odh-training-rocm62-torch24-py311-rhel9 1788178712, rhoai/odh-training-rocm62-torch25-py311-rhel9 1788178637, +19 more
    fixed: vendor fix RHSA-2026:65126
  • Red Hat OpenShift AI 3.3 rhoai/odh-mlserver-rhel9 1789121365, rhoai/odh-llama-stack-core-rhel9 1789121286, rhoai/odh-trustyai-nemo-guardrails-server-rhel9 1789570674
    fixed: vendor fix RHSA-2026:73987
  • Red Hat OpenShift AI 3.4 rhoai/odh-autorag-rhel9 1791557539, rhoai/odh-mlserver-rhel9 1791446063, rhoai/odh-ta-lmes-job-rhel9 1791470318, rhoai/odh-feature-server-rhel9 1791863220, rhoai/odh-llama-stack-core-rhel9 1790958470, rhoai/odh-kserve-autogluon-server-rhel9 1791300023, +30 more
    fixed: vendor fix RHSA-2026:84734
  • Red Hat OpenShift AI 3.5 rhoai/odh-automl-rhel9 1791916705, rhoai/odh-mlserver-rhel9 1789532398, rhoai/odh-ta-lmes-job-rhel9 1788935863, rhoai/odh-mlserver-cuda-rhel9 1789529984, rhoai/odh-th-torch-cpu-py312-rhel9 1791926611, rhoai/odh-th-torch-cuda-py312-rhel9 1791927642, +23 more
    fixed: vendor fix RHSA-2026:86891
  • Red Hat Satellite 6.16 for RHEL 8 python-aiohttp 3.14.3-1.el8pc, python3.11-aiohttp 3.14.3-1.el8pc Red Hat Satellite 6.16 for RHEL 9 python-aiohttp 3.14.3-1.el9pc, python3.11-aiohttp 3.14.3-1.el9pc
    fixed: vendor fix RHSA-2026:63327
  • Red Hat Satellite 6.17 for RHEL 9 ansible-core 2.16.19-1.el9sat, ansible-test 2.16.19-1.el9sat, python-aiohttp 3.14.3-1.el9pc, python3.11-aiohttp 3.14.3-1.el9pc
    fixed: vendor fix RHSA-2026:63387
  • Red Hat Satellite 6.18 satellite/iop-insights-engine-rhel9 1789260306, satellite/iop-vulnerability-engine-rhel9 1788190382
    fixed: vendor fix RHSA-2026:68770
  • Red Hat Satellite 6.18 for RHEL 9 python3.12-aiohttp 3.14.3-1.el9pc, python3.12-pulpcore 3.73.30-3.el9pc, pulpcore-obsolete-packages 1.3.1-5.el9pc
    fixed: vendor fix RHSA-2026:63386
  • Red Hat Satellite 6.19 satellite/iop-insights-engine-rhel9 1789273626, satellite/iop-vulnerability-engine-rhel9 1788190224
    fixed: vendor fix RHSA-2026:68775
  • Red Hat Satellite 6.19 for RHEL 9 python3.12-aiohttp 3.14.3-1.el9pc
    fixed: vendor fix RHSA-2026:63385
  • Red Hat OpenShift Lightspeed openshift-lightspeed/lightspeed-ocp-rag-rhel9, openshift-lightspeed-tech-preview/lightspeed-rag-tool-rhel9
    not affected: vulnerable code not in execute path
  • Red Hat Ansible Automation Platform 2 ansible-automation-platform-26/controller-rhel9, ansible-automation-platform-27/controller-rhel9, ansible-automation-platform-27/ee-control-plane-rhel9, ansible-automation-platform-26/lightspeed-chatbot-rhel9, ansible-automation-platform-27/lightspeed-chatbot-rhel9 Red Hat Ansible Automation Platform 2.5 for RHEL 8 automation-hub 4.10.18-1.el8ap, python3.12-django 5.2.17-1.el8ap, python3.12-gitpython 3.1.59-1.el8ap, automation-controller 4.6.32-1.el8ap, python3.12-galaxy-ng 4.10.18-1.el8ap, automation-controller-ui 4.6.32-1.el8ap, +11 more Red Hat Ansible Automation Platform 2.5 for RHEL 9 automation-hub 4.10.18-1.el9ap, python3.12-django 5.2.17-1.el9ap, python3.12-gitpython 3.1.59-1.el9ap, automation-controller 4.6.32-1.el9ap, python3.12-galaxy-ng 4.10.18-1.el9ap, automation-controller-ui 4.6.32-1.el9ap, +11 more Red Hat Ansible Automation Platform 2.6 ansible-automation-platform-26/hub-rhel9 1791947385, ansible-automation-platform-26/gateway-rhel9 1787219751, ansible-automation-platform-26/gateway-rhel9 1791971533, ansible-automation-platform-26/hub-web-rhel9 1787224278, ansible-automation-platform-26/hub-web-rhel9 1791952205, ansible-automation-platform-26/receptor-rhel9 1787202412, +52 more Red Hat Ansible Automation Platform 2.6 for RHEL 9 molecule 26.8.0-1.el9ap, ansible-lint 26.8.0-1.el9ap, python3.12-nh3 0.3.6-1.el9ap, ansible-creator 26.8.0-1.el9ap, automation-hub 4.11.13-1.el9ap, ansible-dev-tools 26.8.0-1.el9ap, +36 more
    not affected: vulnerable code not present

15 more not affected in the full advisory

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
3 mo ago

Exploit prediction

0.44% chance of exploitation in the next 30 days, higher than 38% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 6.3 CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
CNA 4.0 6.3 CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected packages

ecosystem package affected fixed in
pypi aiohttp
<3.14.2
3.14.2

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.