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

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2026-44432
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-13 16:16:57 UTC
Updated2026-07-16 12:17:53 UTC
Descriptionurllib3 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.

Risk And Classification

Primary CVSS: v4.0 8.9 HIGH from [email protected]

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

EPSS: 0.006800000 probability, percentile 0.482500000 (date 2026-07-16)

Problem Types: CWE-409 | CWE-409 CWE-409: Improper Handling of Highly Compressed Data (Data Amplification) | CWE-409 Improper Handling of Highly Compressed Data (Data Amplification)

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary8.9HIGHCVSS: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/C...
4.0CNADECLARED8.9HIGHCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H
3.1[email protected]Primary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1ADPCVSS7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.10b0ca135-0b70-47e7-9f44-1890c2a1c46cSecondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
Present
Privileges Required
None
User Interaction
None
Confidentiality
None
Integrity
None
Availability
High
Sub Conf.
None
Sub Integrity
None
Sub Availability
High

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

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Python Urllib3 All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Urllib3 Urllib3 affected >= 2.6.0, < 2.7.0 Not specified
ADP Red Hat Migration Toolkit For Applications 8 Not specified Not specified
ADP Red Hat OpenShift Lightspeed Not specified Not specified
ADP Red Hat Pen Drive Powered By Red Hat Lightspeed Not specified Not specified
ADP Red Hat Red Hat AI Inference Server Not specified Not specified
ADP Red Hat Red Hat Ansible Automation Platform 2 Not specified Not specified
ADP Red Hat Red Hat OpenShift AI RHOAI Not specified Not specified
ADP Red Hat Red Hat OpenShift Container Platform 4 Not specified Not specified
ADP Red Hat Red Hat Quay 3 Not specified Not specified
ADP Red Hat Red Hat Satellite 6 Not specified Not specified
ADP Red Hat Service Telemetry Framework 1.5 Not specified Not specified
ADP Red Hat Red Hat Ansible Automation Platform 2.6 For RHEL 9 Not specified Not specified
ADP Red Hat Red Hat Ansible Automation Platform 2.6 Not specified Not specified
ADP Red Hat Red Hat Ansible Automation Platform 2.7 Not specified Not specified
ADP Red Hat Red Hat Discovery 2 Not specified Not specified
ADP Red Hat Red Hat OpenShift AI 3.3 Not specified Not specified
ADP Red Hat Red Hat Quay 3.10 Not specified Not specified
ADP Red Hat Red Hat Quay 3.12 Not specified Not specified
ADP Red Hat Red Hat Quay 3.9 Not specified Not specified
ADP Red Hat Exploit Intelligence Not specified Not specified
ADP Red Hat External Secrets Operator For Red Hat OpenShift Not specified Not specified
ADP Red Hat Migration Toolkit For Containers Not specified Not specified
ADP Red Hat Migration Toolkit For Virtualization Not specified Not specified
ADP Red Hat OpenShift Lightspeed Not specified Not specified
ADP Red Hat OpenShift Service Mesh 3 Not specified Not specified
ADP Red Hat Red Hat Ansible Automation Platform 2 Not specified Not specified
ADP Red Hat Red Hat Build Of Quarkus Native Builder Not specified Not specified
ADP Red Hat Red Hat Developer Hub Not specified Not specified
ADP Red Hat Red Hat Enterprise Linux 10 Not specified Not specified
ADP Red Hat Red Hat Enterprise Linux 7 Not specified Not specified
ADP Red Hat Red Hat Enterprise Linux 8 Not specified Not specified
ADP Red Hat Red Hat Enterprise Linux 9 Not specified Not specified
ADP Red Hat Red Hat Enterprise Linux AI RHEL AI 3 Not specified Not specified
ADP Red Hat Red Hat OpenShift AI RHOAI Not specified Not specified
ADP Red Hat Red Hat OpenShift Container Platform 4 Not specified Not specified
ADP Red Hat Red Hat OpenShift Virtualization 4 Not specified Not specified
ADP Red Hat Red Hat Satellite 6 Not specified Not specified
ADP Red Hat Red Hat Enterprise Linux AppStream V. 10 Not specified Not specified
ADP Red Hat Red Hat Enterprise Linux AppStream V. 8 Not specified Not specified
ADP Red Hat Red Hat Enterprise Linux AppStream V. 9 Not specified Not specified
ADP Red Hat Red Hat Enterprise Linux BaseOS V. 10 Not specified Not specified
ADP Red Hat Red Hat Enterprise Linux BaseOS V. 9 Not specified Not specified
ADP Red Hat Red Hat AI Inference Server 3.3 Not specified Not specified
ADP Red Hat Red Hat AI Inference Server 3.4 Not specified Not specified
ADP Red Hat Red Hat Hardened Images Not specified Not specified
ADP Red Hat Red Hat Satellite 6.18 Not specified Not specified
ADP Red Hat Red Hat Satellite 6.19 Not specified Not specified
ADP Red Hat Red Hat Trusted Artifact Signer 1.3 Not specified Not specified
ADP Red Hat Red Hat Trusted Artifact Signer 1.4 Not specified Not specified

References

ReferenceSourceLinkTags
access.redhat.com/errata/RHSA-2026:24014 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:33683 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:7625 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:34374 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:24009 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:34533 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:28158 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:20338 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:24542 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:28157 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:34531 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:24476 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:30076 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:24540 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:26304 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:28571 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:24069 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44432.json 0b0ca135-0b70-47e7-9f44-1890c2a1c46c security.access.redhat.com
access.redhat.com/errata/RHSA-2026:34526 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:33313 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:22934 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:37275 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:30089 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:34160 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
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access.redhat.com/errata/RHSA-2026:28000 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:24000 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:32992 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
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github.com/urllib3/urllib3/security/advisories/GHSA-mf9v-mfxr-j63j [email protected] github.com Mitigation, Vendor Advisory
access.redhat.com/errata/RHSA-2026:27929 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:30088 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:25039 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/security/cve/CVE-2026-44432 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:26212 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:25928 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:36350 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:24374 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
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access.redhat.com/errata/RHSA-2026:23992 MITRE access.redhat.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
ADP2026-05-13T17:01:01.083ZReported to Red Hat.
ADP2026-05-13T15:17:12.611ZMade public.

Solutions

ADP: RHSA-2026:34160: Red Hat Ansible Automation Platform 2.6 for RHEL 9

ADP: RHSA-2026:27929: Red Hat Enterprise Linux AppStream (v. 10)

ADP: RHSA-2026:32992: Red Hat Enterprise Linux AppStream (v. 8)

ADP: RHSA-2026:28159: Red Hat Enterprise Linux AppStream (v. 9)

ADP: RHSA-2026:28157: Red Hat Enterprise Linux AppStream (v. 9)

ADP: RHSA-2026:28000: Red Hat Enterprise Linux BaseOS (v. 10)

ADP: RHSA-2026:28158: Red Hat Enterprise Linux BaseOS (v. 9)

ADP: RHSA-2026:30078: Red Hat AI Inference Server 3.3

ADP: RHSA-2026:30089: Red Hat AI Inference Server 3.3

ADP: RHSA-2026:30088: Red Hat AI Inference Server 3.3

ADP: RHSA-2026:30087: Red Hat AI Inference Server 3.3

ADP: RHSA-2026:24542: Red Hat AI Inference Server 3.4

ADP: RHSA-2026:24540: Red Hat AI Inference Server 3.4

ADP: RHSA-2026:24544: Red Hat AI Inference Server 3.4

ADP: RHSA-2026:24541: Red Hat AI Inference Server 3.4

ADP: RHSA-2026:34374: Red Hat Ansible Automation Platform 2.6

ADP: RHSA-2026:25928: Red Hat Ansible Automation Platform 2.7

ADP: RHSA-2026:20338: Red Hat Discovery 2

ADP: RHSA-2026:33313: Red Hat Discovery 2

ADP: RHSA-2026:25039: Red Hat Hardened Images

ADP: RHSA-2026:7634: Red Hat Hardened Images

ADP: RHSA-2026:24069: Red Hat Hardened Images

ADP: RHSA-2026:25143: Red Hat Hardened Images

ADP: RHSA-2026:24014: Red Hat Hardened Images

ADP: RHSA-2026:24374: Red Hat Hardened Images

ADP: RHSA-2026:7625: Red Hat Hardened Images

ADP: RHSA-2026:24000: Red Hat Hardened Images

ADP: RHSA-2026:24009: Red Hat Hardened Images

ADP: RHSA-2026:22934: Red Hat Hardened Images

ADP: RHSA-2026:15862: Red Hat Hardened Images

ADP: RHSA-2026:37275: Red Hat OpenShift AI 3.3

ADP: RHSA-2026:33683: Red Hat Quay 3.10

ADP: RHSA-2026:30076: Red Hat Quay 3.12

ADP: RHSA-2026:28571: Red Hat Quay 3.9

ADP: RHSA-2026:36350: Red Hat Satellite 6.18

ADP: RHSA-2026:26304: Red Hat Satellite 6.18

ADP: RHSA-2026:26212: Red Hat Satellite 6.18

ADP: RHSA-2026:34607: Red Hat Satellite 6.19

ADP: RHSA-2026:34531: Red Hat Satellite 6.19

ADP: RHSA-2026:34526: Red Hat Satellite 6.19

ADP: RHSA-2026:34533: Red Hat Satellite 6.19

ADP: RHSA-2026:24476: Red Hat Trusted Artifact Signer 1.3

ADP: RHSA-2026:24483: Red Hat Trusted Artifact Signer 1.4

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