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Fencer Intel
high 7.5

CVE-2025-53643 json

AIOHTTP is vulnerable to HTTP Request/Response Smuggling through incorrect parsing of chunked trailer sections

published last yr. modified last mo. also EUVD-2025-21384 , GHSA-9548-qrrj-x5pj , PYSEC-2026-1104

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 29%
public exploits
0
none known

Summary

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.12.14, the Python parser is vulnerable to a request smuggling vulnerability due to not parsing trailer sections of an HTTP request. If a pure Python version of aiohttp is installed (i.e. without the usual C extensions) or AIOHTTP_NO_EXTENSIONS is enabled, then an attacker may be able to execute a request smuggling attack to bypass certain firewalls or proxy protections. Version 3.12.14 contains a patch for this issue.

Patch / fix

  • pypi aiohttp 3.12.14
  • aiohttp aiohttp 3.12.14
  • python-aiohttp Debian 12 3.8.4-1+deb12u2
  • python-aiohttp Debian 14 3.12.15-1

debian advisories DEBIAN-CVE-2025-53643

  • receptor ansible automation platform 2.6 1.6.3-2.el10ap
  • receptor ansible automation platform inside 2.6, ansible automation platform developer 2.6, ansible automation platform 2.6 1.6.3-2.el9ap
  • python3.11-django ansible automation platform developer 2.6, ansible automation platform 2.6 4.2.27-2.el9ap
  • python3.11-urllib3 ansible automation platform developer 2.6, ansible automation platform developer 2.5, ansible automation platform 2.6 +1 more 2.6.3-1.el9ap
  • python3.11-protobuf ansible automation platform 2.6 4.25.8-1.el9ap
  • automation-controller-venv-tower ansible automation platform 2.6 4.7.8-1.el9ap
  • python3.12-aiohttp satellite capsule 6.18, satellite 6.18 3.13.3-1.el9pc
  • python3.12-urllib3 satellite capsule 6.18, satellite 6.18 2.6.3-1.el9pc

red hat advisories RHSA-2026:1249RHSA-2026:2760RHSA-2026:1506

  • python-Brotli SLES for SAP applications 16.0, SLES 16.0 1.1.0-160000.3.1
  • python-aiohttp SLES for SAP applications 16.0, SLES 16.0 3.11.16-160000.3.1
  • python-aiohttp SLE Module for Public Cloud 15 SP7, SLE Module for Public Cloud 15 SP6, SLE Module for Public Cloud 15 SP5 +2 more 3.6.0-150100.3.27.1
  • python-aiohttp SLE Module for Python 3 15 SP7, SLE Module for Python 3 15 SP6, SLE Module for Public Cloud 15 SP4 +1 more 3.9.3-150400.10.33.1

suse advisories SUSE-SU-2026:20425-1SUSE-SU-2025:03201-1SUSE-SU-2025:03057-1

  • python-Brotli openSUSE Leap 16.0 1.1.0-160000.3.1
  • python-aiohttp openSUSE Leap 16.0 3.11.16-160000.3.1

opensuse advisories openSUSE-SU-2026:20204-1

Is CVE-2025-53643 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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-2025-53643 updated cvss 3.7

aiohttp: AIOHTTP HTTP Request/Response Smuggling

  • Red Hat OpenShift Lightspeed openshift-lightspeed/lightspeed-service-api-rhel9
    affected: workaround, no fix available
  • Red Hat Ansible Automation Platform 2 ansible-automation-platform-24/lightspeed-rhel8, ansible-automation-platform-25/lightspeed-chatbot-rhel8 Red Hat Enterprise Linux AI (RHEL AI) rhelai1/bootc-amd-rhel9, rhelai1/bootc-intel-rhel9, rhelai1/bootc-nvidia-rhel9, rhelai1/bootc-azure-amd-rhel9, rhelai1/instructlab-amd-rhel9, rhelai1/bootc-aws-nvidia-rhel9, +4 more
    affected: workaround, no fix available “Fix deferred”
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-ml-pipelines-runtime-generic-rhel9
    affected: workaround, no fix available
  • Red Hat Ansible Automation Platform 2.5 for RHEL 8 automation-controller-venv-tower 4.6.25-1.el8ap Red Hat Ansible Automation Platform 2.5 for RHEL 9 automation-controller-venv-tower 4.6.25-1.el9ap
    fixed: vendor fix RHSA-2026:1506
  • Red Hat Ansible Automation Platform 2.6 ansible-automation-platform-26 1772508458
    fixed: vendor fix RHSA-2026:3960
  • Red Hat Ansible Automation Platform 2.6 for RHEL 9 automation-controller-venv-tower 4.7.8-1.el9ap
    fixed: vendor fix RHSA-2026:1249
  • Red Hat OpenShift AI 2.22 rhoai v2.22.3-1763565765
    fixed: vendor fix RHSA-2025:22759
  • Red Hat OpenShift AI 2.25 rhoai v2.25.1-1765354568
    fixed: vendor fix RHSA-2025:23531
show 4 more
  • Red Hat OpenShift Service Mesh 3.0 openshift-service-mesh 1.24.6-1764181669
    fixed: vendor fix RHSA-2025:22939
  • Red Hat OpenShift Service Mesh 3.1 openshift-service-mesh 1.26.6-1764332723
    fixed: vendor fix RHSA-2025:22944
  • Red Hat Satellite 6.18 for RHEL 9 python3.12-aiohttp 3.13.3-1.el9pc
    fixed: vendor fix RHSA-2026:2760
  • Red Hat OpenShift Lightspeed openshift-lightspeed-tech-preview/lightspeed-rag-tool-rhel9 Red Hat OpenShift Service Mesh 3 openshift-service-mesh/istio-cni-rhel9, openshift-service-mesh/istio-pilot-rhel9, openshift-service-mesh/istio-rhel9-operator, openshift-service-mesh/istio-must-gather-rhel9, openshift-service-mesh/istio-sail-operator-bundle, openshift-service-mesh-dev-preview-beta/istio-ztunnel-rhel9 Red Hat AI Inference Server rhaiis/vllm-cuda-rhel9, rhaiis/vllm-rocm-rhel9 Red Hat Ansible Automation Platform 2 python-aiohttp, python3x-aiohttp, python3.11-aiohttp, ansible-automation-platform-24/de-minimal-rhel8, ansible-automation-platform-24/de-minimal-rhel9, ansible-automation-platform-25/de-minimal-rhel8, +11 more Red Hat Ansible Automation Platform 2.5 for RHEL 8 receptor 1.6.3-1.el8ap, receptorctl 1.6.3-1.el8ap, ansible-lint 26.1.0-1.el8ap, ansible-core 2.16.15-1.el8ap, ansible-test 2.16.15-1.el8ap, automation-hub 4.10.11-1.el8ap, +16 more Red Hat Ansible Automation Platform 2.5 for RHEL 9 receptor 1.6.3-1.el9ap, receptorctl 1.6.3-1.el9ap, ansible-lint 26.1.0-1.el9ap, ansible-core 2.16.15-1.el9ap, ansible-test 2.16.15-1.el9ap, automation-hub 4.10.11-1.el9ap, +16 more
    +13 more products
    Red Hat Ansible Automation Platform 2.6 ansible-automation-platform 1772556678, ansible-automation-platform 1772556679, ansible-automation-platform-26 1772204398, ansible-automation-platform-26 1772381996, ansible-automation-platform-26 1772382003, ansible-automation-platform-26 1772382254, +21 more Red Hat Ansible Automation Platform 2.6 for RHEL 9 receptor 1.6.3-2.el9ap, receptorctl 1.6.3-2.el9ap, ansible-lint 26.1.0-2.el9ap, ansible-core 2.16.15-1.el9ap, ansible-test 2.16.15-1.el9ap, automation-hub 4.11.5-1.el9ap, +37 more Red Hat Ansible Automation Platform 2.6 for RHEL 10 receptor 1.6.3-2.el10ap, receptorctl 1.6.3-2.el10ap, ansible-lint 26.1.0-2.el10ap, ansible-core 2.16.15-2.el10ap, python-django 4.2.27-2.el10ap, python3-django 4.2.27-2.el10ap, +3 more Red Hat Enterprise Linux AI (RHEL AI) rhelai1/gemma-2-9b-it, rhelai1/gemma-2-9b-it-fp8, rhelai1/skills-adapter-v3, rhelai1/knowledge-adapter-v3, rhelai1/prometheus-8x7b-v2-0, rhelai1/modelcar-gemma-2-9b-it, +14 more Red Hat OpenShift AI (RHOAI) rhoai/odh-mm-rest-proxy-rhel9, rhoai/odh-feast-operator-rhel9, rhoai/odh-model-registry-rhel8, rhoai/odh-model-registry-rhel9, rhoai/odh-kueue-controller-rhel8, rhoai/odh-kueue-controller-rhel9, +31 more Red Hat OpenShift AI 2.22 rhoai v2.22.3-1763051808, rhoai v2.22.3-1763639678, rhoai v2.22.3-1764181290, rhoai v2.22.3-1764293130, rhoai v2.22.3-1764593039, rhoai v2.22.3-1764594154, +17 more Red Hat OpenShift AI 2.25 rhoai 0.0-1763988459, rhoai v2.25.1-1764757768, rhoai v2.25.1-1764757769, rhoai v2.25.1-1764757770, rhoai v2.25.1-1764757772, rhoai v2.25.1-1764757773, +35 more Red Hat OpenShift distributed tracing 3 rhosdt/opentelemetry-rhel8-operator, rhosdt/opentelemetry-collector-rhel8, rhosdt/opentelemetry-operator-bundle, rhosdt/opentelemetry-target-allocator-rhel8 Red Hat OpenShift Service Mesh 3.0 openshift-service-mesh 3.0.7-1764100655, openshift-service-mesh 3.0.7-1764181345, openshift-service-mesh 3.0.7-1764201310, openshift-service-mesh 1.24.6-1764181348, openshift-service-mesh 1.24.6-1764181421, openshift-service-mesh-dev-preview-beta 1.24.6-1764195888 Red Hat OpenShift Service Mesh 3.1 openshift-service-mesh 3.1.4-1763937829, openshift-service-mesh 3.1.4-1764100822, openshift-service-mesh 3.1.4-1764338934, openshift-service-mesh 1.26.6-1763937781, openshift-service-mesh 1.26.6-1763937809, openshift-service-mesh-tech-preview 1.26.6-1764312859 Red Hat Satellite 6 python-aiohttp, python3-aiohttp, python-aiohttp-xmlrpc, python3-aiohttp-xmlrpc Red Hat Satellite 6.18 for RHEL 9 satellite 6.18.3-1.el9sat, foreman 3.16.0.10-1.el9sat, satellite-cli 6.18.3-1.el9sat, foreman-cli 3.16.0.10-1.el9sat, foreman-ec2 3.16.0.10-1.el9sat, foreman-pcp 3.16.0.10-1.el9sat, +24 more Red Hat Update Infrastructure 4 for Cloud Providers python-aiohttp, python-aiohttp-xmlrpc
    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
last yr.

Exploit prediction

0.36% chance of exploitation in the next 30 days, higher than 29% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 4.0 1.7 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U
CNA 4.0 1.7 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/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
NVD 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
<3.12.14
3.12.14

Affected products

  • aio-libs aiohttp

Classification

Weakness
  • CWE-444 Inconsistent Interpretation of HTTP Requests

References

Sources

Fencer Intel 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.