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Fencer Vulns
high 7.5

CVE-2026-44432 json

urllib3: Decompression-bomb safeguards bypassed in parts of the streaming API

published 2026-05-11 5 mo ago modified 2026-09-10 1 mo ago also EUVD-2026-30047 , GHSA-mf9v-mfxr-j63j , PYSEC-2026-142

cvss
7.5
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

urllib3 is an HTTP client library for Python. From 2.6.0 to before 2.7.0, urllib3 could decompress the whole response instead of the requested portion (1) during the second HTTPResponse.read(amt=N) call when the response was decompressed using the official Brotli library or (2) when HTTPResponse.drain_conn() was called after the response had been read and decompressed partially (compression algorithm did not matter here). These issues could cause urllib3 to fully decode a small amount of highly compressed data in a single operation. This could result in excessive resource consumption (high CPU usage and massive memory allocation for the decompressed data) on the client side. This vulnerability is fixed in 2.7.0.

Patch / fix

  • pypi urllib3 2.7.0
  • Red Hat Red Hat Ansible Automation Platform 2.5 for RHEL 8 0:4.6.30-2.el8ap
  • Red Hat Red Hat Ansible Automation Platform 2.5 for RHEL 9 0:4.6.30-2.el9ap
  • Red Hat Red Hat Ansible Automation Platform 2.6 for RHEL 9 0:2.7.0-1.el9ap, 0:4.7.14-3.el9ap
  • Red Hat Red Hat Enterprise Linux 10 0:1.26.19-4.el10_2, 0:2.6.3-2.el10_2
  • Red Hat Red Hat Enterprise Linux 8 0:1.26.19-3.el8_10
  • Red Hat Red Hat Enterprise Linux 9 0:1.26.5-8.el9_8, 0:1.26.19-3.el9_8, 0:2.6.3-2.el9_8
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:1.26.5-3.el9_2.4
  • Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions 0:1.26.5-5.el9_4.4
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:1.26.5-6.el9_6.2
  • Red Hat Red Hat AI Inference Server 3.3 1782352847, 1782352919, 1782352950, 1782353093
  • Red Hat Red Hat AI Inference Server 3.4 1780356811, 1780356904, 1780356914, 1780356941
  • Red Hat Red Hat Ansible Automation Platform 2.5 1784050598
  • Red Hat Red Hat Ansible Automation Platform 2.6 1782650747, 1782761510, 1783921549, 1783923629, 1783969139, 1783973764
  • Red Hat Red Hat Ansible Automation Platform 2.7 1781028735, 1781102816
  • Red Hat Red Hat Discovery 2 1779395228, 1782756541
  • Red Hat Red Hat Hardened Images 0.69.3-1.2.hum1, 1.2.1-2.hum1, 1.96.0-1.hum1, 2.7.0-3.hum1, 2.19.0-1.hum1, 2.48.0-4.1.hum1, 11.8.8-1.hum1, 21.1.8-1.1.hum1, 21.1.8-6.hum1, 48.0.0-3.hum1, 2026.5.1-1.hum1
  • Red Hat Red Hat Migration Toolkit for Applications 8.2 1784109883, 1786481481
  • Red Hat Red Hat OpenShift AI 2.25 1783024305, 1783091175, 1783112979, 1783342900, 1783701598, 1783998774, 1783998857
  • Red Hat Red Hat OpenShift AI 3.3 1782471555, 1782471579, 1782471656, 1782471663, 1782472374, 1782854229, 1782887848, 1782917849, 1782991170, 1783010225, 1783069204, 1783073038
  • Red Hat Red Hat Quay 3.10 1782487717
  • Red Hat Red Hat Quay 3.12 1781937357
  • Red Hat Red Hat Quay 3.15 1784351966
  • Red Hat Red Hat Quay 3.16 1783955846
  • Red Hat Red Hat Quay 3.9 1781878070
  • Red Hat Red Hat Satellite 6.18 1779711334, 1779792651, 1782739344
  • Red Hat Red Hat Satellite 6.19 1780393451, 1782139619, 1782380482, 1782448455, 1784558259
  • Red Hat Red Hat Trusted Artifact Signer 1.3 1780560117
  • Red Hat Red Hat Trusted Artifact Signer 1.4 1780914886
  • Red Hat Red Hat Update Infrastructure 5 1784794289, 1784794778, 1784794818, 1784795076, 1784795112, 1787135742, 1787241211, 1787241260
  • python-urllib3 Debian 14 2.7.0-1

debian advisories DEBIAN-CVE-2026-44432

  • python-urllib3 Ubuntu 26.04 LTS 2.6.3-1ubuntu1.1

ubuntu advisories UBUNTU-CVE-2026-44432

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

  • receptor ansible automation platform 2.6 1.6.6-1.el10ap
  • receptor ansible automation platform inside 2.6, ansible automation platform inside 2.5, ansible automation platform developer 2.6 +3 more 1.6.6-1.el9ap
  • ansible-core ansible automation platform developer 2.6, ansible automation platform 2.6 2:2.16.19-1.el10ap
  • ansible-core ansible automation platform inside 2.6, ansible automation platform inside 2.5, ansible automation platform developer 2.6 +3 more 1:2.16.19-1.el9ap
  • python3.12-pulpcore ansible automation platform 2.6 3.49.63-2.el9ap
  • python3.12-gitpython ansible automation platform 2.6 3.1.50-1.el9ap
  • automation-platform-ui ansible automation platform 2.6 2.6.11-1.el9ap
  • automation-gateway-proxy ansible automation platform 2.6 2.6.17-1.el9ap

red hat advisories RHSA-2026:60371RHSA-2026:60362RHSA-2026:59409RHSA-2026:42079RHSA-2026:42078RHSA-2026:34160

  • python-urllib3 openSUSE Tumbleweed 2.7.0-1.1

opensuse advisories openSUSE-SU-2026:10798-1

  • python3.12-urllib3 AlmaLinux 8 1.26.19-3.el8_10
  • python3.14-urllib3 AlmaLinux 9 2.6.3-2.el9_8
  • python3-urllib3 AlmaLinux 9 1.26.5-8.el9_8
  • python3.12-urllib3 AlmaLinux 9 1.26.19-3.el9_8
  • python3.14-urllib3 AlmaLinux 10 2.6.3-2.el10_2
  • python3-urllib3 AlmaLinux 10 1.26.19-4.el10_2

almalinux advisories ALSA-2026:32992ALSA-2026:28157ALSA-2026:28158ALSA-2026:28159ALSA-2026:27929ALSA-2026:28000

  • python3.12-urllib3 Rocky Linux 8 1.26.19-3.el8_10
  • python-urllib3 Rocky Linux 10 1.26.19-4.el10_2
  • python3.14-urllib3 Rocky Linux 10 2.6.3-2.el10_2
  • python-urllib3 Rocky Linux 9 1.26.5-8.el9_8
  • python3.14-urllib3 Rocky Linux 9 2.6.3-2.el9_8
  • python3.12-urllib3 Rocky Linux 9 1.26.19-3.el9_8

rocky linux advisories RLSA-2026:32992RLSA-2026:28000RLSA-2026:27929RLSA-2026:28158RLSA-2026:28157RLSA-2026:28159

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-2026-44432 updated cvss 7.5

urllib3: urllib3: Denial of Service due to excessive HTTP response decompression

  • Red Hat OpenShift Lightspeed openshift-lightspeed/lightspeed-service-api-rhel9, openshift-lightspeed/lightspeed-to-dataverse-exporter-rhel9
    affected: no fix available
  • Red Hat Pen Drive Powered by Red Hat Lightspeed pen-drive/pen-drive-scanner-rhel9 Red Hat AI Inference Server rhaiis/vllm-cpu-rhel9, rhaiis/vllm-tpu-rhel9, rhaiis/vllm-neuron-rhel9
    affected: no fix planned “Will not fix”
  • Red Hat Ansible Automation Platform 2 ansible-automation-platform-26/hub-rhel9, ansible-automation-platform-24/lightspeed-rhel8, ansible-automation-platform-25/lightspeed-rhel8, ansible-automation-platform-26/lightspeed-rhel9, ansible-automation-platform-26/hub-rhel9-operator, ansible-automation-platform-26/eda-controller-rhel9, +8 more
    affected: no fix available, no fix planned “Will not fix”
  • Red Hat OpenShift AI (RHOAI) rhoai/rhai-cli-rhel9, rhoai/odh-vllm-gaudi-rhel9, rhoai/odh-openvino-model-server-rhel9, rhoai/odh-llm-d-inference-scheduler-rhel9
    affected: no fix available
  • 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 1782352847, rhaiis/vllm-rocm-rhel9 1782353093, rhaiis/vllm-spyre-rhel9 1782352919, rhaiis/model-opt-cuda-rhel9 1782352950
    fixed: vendor fix RHSA-2026:30078
  • Red Hat AI Inference Server 3.4 rhaii/vllm-cpu-rhel9 1780356811, rhaii/vllm-cuda-rhel9 1780356914, rhaii/vllm-spyre-rhel9 1780356904, rhaii/model-opt-cuda-rhel9 1780356941
    fixed: vendor fix RHSA-2026:24542
  • Red Hat AI Inference Server 3.5 rhaii/vllm-cpu-rhel9 1791473614, rhaii/vllm-cuda-rhel9 1791473631, rhaii/vllm-rocm-rhel9 1791425869, rhaii/vllm-gaudi-rhel9 1791427182, rhaii/vllm-spyre-rhel9 1791818357, rhaii/model-opt-cuda-rhel9 1791803821
    fixed: vendor fix RHSA-2026:82066
show 30 more
  • Red Hat Ansible Automation Platform 2.5 ansible-automation-platform-25/hub-rhel8 1784050598
    fixed: vendor fix RHSA-2026:42144
  • Red Hat Ansible Automation Platform 2.5 for RHEL 8 automation-controller-venv-tower 4.6.30-2.el8ap Red Hat Ansible Automation Platform 2.5 for RHEL 9 automation-controller-venv-tower 4.6.30-2.el9ap
    fixed: vendor fix RHSA-2026:42078
  • Red Hat Ansible Automation Platform 2.6 ansible-automation-platform-26/gateway-rhel9 1782761510, ansible-automation-platform-26/controller-rhel9 1783973764, ansible-automation-platform-26/de-minimal-rhel9 1783921549, ansible-automation-platform-26/de-supported-rhel9 1783923629, ansible-automation-platform-26/lightspeed-chatbot-rhel9 1782650747, ansible-automation-platform-tech-preview/metrics-service-rhel9 1783969139
    fixed: vendor fix RHSA-2026:42132
  • Red Hat Ansible Automation Platform 2.6 for RHEL 9 python3.12-urllib3 2.7.0-1.el9ap, automation-controller-venv-tower 4.7.14-3.el9ap
    fixed: vendor fix RHSA-2026:34160
  • Red Hat Ansible Automation Platform 2.7 ansible-automation-platform-27/hub-rhel9 1781102816, ansible-automation-platform-27/eda-controller-rhel9 1781028735
    fixed: vendor fix RHSA-2026:25928
  • Red Hat Discovery 2 discovery 1779395228, discovery/discovery-ui-rhel9 1782756541
    fixed: vendor fix RHSA-2026:20338
  • Red Hat Enterprise Linux AI 3.5 rhelai3/bootc-cuda-rhel9 1793135861, rhelai3/bootc-rocm-rhel9 1793135863, rhelai3/bootc-aws-cuda-rhel9 1793194817, rhelai3/bootc-gcp-cuda-rhel9 1793194815, rhelai3/disk-image-cuda-rhel9 1793206758, rhelai3/bootc-azure-cuda-rhel9 1793194815, +1 more
    fixed: vendor fix RHSA-2026:92452
  • Red Hat Enterprise Linux AppStream (v. 8) python3.12-urllib3 1.26.19-3.el8_10
    fixed: vendor fix RHSA-2026:32992
  • Red Hat Enterprise Linux AppStream (v. 9) python3.14-urllib3 2.6.3-2.el9_8, python3.12-urllib3 1.26.19-3.el9_8
    fixed: vendor fix RHSA-2026:28159
  • Red Hat Enterprise Linux AppStream (v. 10) python3.14-urllib3 2.6.3-2.el10_2
    fixed: vendor fix RHSA-2026:27929
  • Red Hat Enterprise Linux BaseOS (v. 9) python-urllib3 1.26.5-8.el9_8, python3-urllib3 1.26.5-8.el9_8
    fixed: vendor fix RHSA-2026:28158
  • Red Hat Enterprise Linux BaseOS (v. 10) python-urllib3 1.26.19-4.el10_2, python3-urllib3 1.26.19-4.el10_2
    fixed: vendor fix RHSA-2026:28000
  • Red Hat Enterprise Linux BaseOS E4S (v.9.2) python-urllib3 1.26.5-3.el9_2.4, python3-urllib3 1.26.5-3.el9_2.4
    fixed: vendor fix RHSA-2026:60362
  • Red Hat Enterprise Linux BaseOS E4S (v.9.4) python-urllib3 1.26.5-5.el9_4.4, python3-urllib3 1.26.5-5.el9_4.4
    fixed: vendor fix RHSA-2026:60371
  • Red Hat Enterprise Linux BaseOS EUS (v.9.6) python-urllib3 1.26.5-6.el9_6.2, python3-urllib3 1.26.5-6.el9_6.2
    fixed: vendor fix RHSA-2026:59409
  • Red Hat Hardened Images rust 1.96.0-1.hum1, cargo 1.96.0-1.hum1, lld 21.1.8-1.1.hum1, lld21 21.1.8-6.hum1, clippy 1.96.0-1.hum1, jaeger 2.19.0-1.hum1, +108 more
    fixed: vendor fix RHSA-2026:22934
  • Red Hat Migration Toolkit for Applications 8.2 mta/mta-rhel9-operator 1786481481, mta/mta-solution-server-rhel9 1784109883
    fixed: vendor fix RHSA-2026:56347
  • Red Hat OpenShift AI 2.25 rhoai/odh-vllm-cuda-rhel9 1783998774, rhoai/odh-vllm-rocm-rhel9 1783998857, rhoai/odh-caikit-nlp-rhel9 1791448212, rhoai/odh-ta-lmes-job-rhel9 1783091175, rhoai/odh-feature-server-rhel9 1792148523, rhoai/odh-llama-stack-core-rhel9 1783701598, +6 more
    fixed: vendor fix RHSA-2026:87410
  • Red Hat OpenShift AI 3.0 rhai/base-image-cpu-rhel9 1790277045, rhai/base-image-tpu-rhel9 1790276884, rhai/base-image-cuda-rhel9 1790276974, rhai/base-image-rocm-rhel9 1790276886, rhai/base-image-spyre-rhel9 1790276889
    fixed: vendor fix RHSA-2026:73960
  • Red Hat OpenShift AI 3.2 rhai/base-image-cpu-rhel9 1790703590, rhai/base-image-tpu-rhel9 1790703497, rhai/base-image-cuda-rhel9 1790703586, rhai/base-image-rocm-rhel9 1790703494, rhai/base-image-rocm-rhel9 1790703506, rhai/base-image-spyre-rhel9 1790703568
    fixed: vendor fix RHSA-2026:74460
  • Red Hat OpenShift AI 3.3 rhoai/odh-mlflow-rhel9 1782917849, rhoai/odh-mlflow-rhel9 1789653606, rhoai/odh-mlserver-rhel9 1782887848, rhoai/odh-kserve-storage-initializer-rhel9 1783010225, rhoai/odh-kserve-storage-initializer-rhel9 1789570435, rhoai/odh-training-rocm62-torch24-py311-rhel9 1782471656, +28 more
    fixed: vendor fix RHSA-2026:37275
  • Red Hat OpenShift AI 3.4 rhai/base-image-neuron-rhel9 1790703542
    fixed: vendor fix RHSA-2026:74674
  • Red Hat OpenShift Container Platform 4.19 openshift4/ose-ansible-rhel9-operator 1793175207
    fixed: vendor fix RHSA-2026:92281
  • Red Hat OpenShift Container Platform 4.20 openshift4/ose-ansible-rhel9-operator 1793175483
    fixed: vendor fix RHSA-2026:92284
  • Red Hat OpenShift Container Platform 4.21 openshift4/ose-ansible-rhel9-operator 1791981285
    fixed: vendor fix RHSA-2026:83703
  • Red Hat Quay 3.9 quay/quay-rhel8 1781878070
    fixed: vendor fix RHSA-2026:28571
  • Red Hat Quay 3.10 quay/quay-rhel8 1782487717
    fixed: vendor fix RHSA-2026:33683
  • Red Hat Quay 3.12 quay/quay-rhel8 1781937357
    fixed: vendor fix RHSA-2026:30076
  • Red Hat Quay 3.14 quay/quay-rhel8 1788593843
    fixed: vendor fix RHSA-2026:70267
  • Red Hat Quay 3.15 quay/quay-rhel8 1784351966
    fixed: vendor fix RHSA-2026:42796

7 more fixed, 44 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
5 mo ago

Exploit prediction

0.68% 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 4.0 8.9 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 4.0 8.9 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/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
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
pypi urllib3
>=2.6.0, <2.7.0
2.7.0

Affected products

  • urllib3 urllib3
  • Red Hat Red Hat Ansible Automation Platform 2.5 for RHEL 8
  • Red Hat Red Hat Ansible Automation Platform 2.5 for RHEL 9
  • Red Hat Red Hat Ansible Automation Platform 2.6 for RHEL 9
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support
  • Red Hat Red Hat AI Inference Server 3.3
  • Red Hat Red Hat AI Inference Server 3.4
  • Red Hat Red Hat Ansible Automation Platform 2.5
  • Red Hat Red Hat Ansible Automation Platform 2.6
  • Red Hat Red Hat Ansible Automation Platform 2.7
  • Red Hat Red Hat Discovery 2
  • Red Hat Red Hat Hardened Images
  • Red Hat Red Hat Migration Toolkit for Applications 8.2
  • Red Hat Red Hat OpenShift AI 2.25
  • Red Hat Red Hat OpenShift AI 3.3
  • Red Hat Red Hat Quay 3.10
  • Red Hat Red Hat Quay 3.12
  • Red Hat Red Hat Quay 3.15
  • Red Hat Red Hat Quay 3.16
  • Red Hat Red Hat Quay 3.9
  • Red Hat Red Hat Satellite 6.18
  • Red Hat Red Hat Satellite 6.19
  • Red Hat Red Hat Trusted Artifact Signer 1.3
  • Red Hat Red Hat Trusted Artifact Signer 1.4
  • Red Hat Red Hat Update Infrastructure 5
  • Red Hat Exploit Intelligence
  • Red Hat External Secrets Operator for Red Hat OpenShift
  • Red Hat Migration Toolkit for Containers
  • Red Hat Migration Toolkit for Virtualization
  • Red Hat OpenShift Lightspeed
  • Red Hat OpenShift Service Mesh 3
  • Red Hat Pen Drive Powered by Red Hat Lightspeed
  • Red Hat Red Hat AI Inference Server
  • Red Hat Red Hat Ansible Automation Platform 2
  • Red Hat Red Hat build of Quarkus Native builder
  • Red Hat Red Hat Developer Hub
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux AI (RHEL AI) 3
  • Red Hat Red Hat OpenShift AI (RHOAI)
  • Red Hat Red Hat OpenShift Container Platform 4
  • Red Hat Red Hat OpenShift Virtualization 4
  • Red Hat Red Hat OpenStack Platform 17.1
  • Red Hat Red Hat Satellite 6
  • Red Hat Red Hat Update Infrastructure 4 for Cloud Providers

Classification

Weakness
  • CWE-409 Improper Handling of Highly Compressed Data (Data Amplification)

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.