> CVE-2025-66471 [HIGH]

« BACK_TO_HOME
PUBLISHED
2025-12-05 17:16
MODIFIED
2025-12-05 17:16
CVSS_SCORE V3
8.9
EPSS (Prob. Exploit)
0.68%
Top 48.0%
DATA SOURCES:
NVD 🔗 2025-12-05 CVE PROJECT 🔗 2026-01-19 CWE MITRE 🔗 2026-11-01 FIRST EPSS 🔗 2026-10-25 GITHUB 🔗 2026-10-28 MSRC 🔗 2026-11-02

> DESCRIPTION

urllib3 is a user-friendly HTTP client library for Python. Starting in version 1.0 and prior to 2.6.0, the Streaming API improperly handles highly compressed data. urllib3's streaming API is designed for the efficient handling of large HTTP responses by reading the content in chunks, rather than loading the entire response body into memory at once. When streaming a compressed response, urllib3 can perform decoding or decompression based on the HTTP Content-Encoding header (e.g., gzip, deflate, br, or zstd). The library must read compressed data from the network and decompress it until the requested chunk size is met. Any resulting decompressed data that exceeds the requested amount is held in an internal buffer for the next read operation. The decompression logic could cause urllib3 to fully decode a small amount of highly compressed data in a single operation. This can result in excessive resource consumption (high CPU usage and massive memory allocation for the decompressed data.

> AFFECTED_PRODUCTS

ℹ️ Aucun produit affecté n'a encore été publié par NVD pour cette CVE.

> CVSS V3 METRICS

CVSS_VECTOR
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

> MÉTRIQUES CVSS DÉTAILLÉES

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
Métrique Valeur Interprétation
AV (Vecteur d'Attaque)
Attack Vector
Network (N)
Exploit possible à distance via réseau (HTTP, API, etc.)
AC (Complexité d'Attaque)
Attack Complexity
Low (L)
Peu de conditions requises pour exploiter
PR (Privilèges Requis)
Privileges Required
None (N)
Aucune authentification requise
UI (Interaction Utilisateur)
User Interaction
None (N)
Aucune interaction utilisateur nécessaire
S (Périmètre)
Scope
Unchanged (U)
Impact reste dans le périmètre du composant compromis
C (Impact Confidentialité)
Confidentiality Impact
None (N)
Aucune divulgation d'informations
I (Impact Intégrité)
Integrity Impact
None (N)
Aucune modification de données possible
A (Impact Disponibilité)
Availability Impact
High (H)
Interruption totale du service possible

> RÉSUMÉ DES IMPACTS

Confidentialité
None
Aucune divulgation d'informations
Intégrité
None
Aucune modification de données possible
Disponibilité
High
Interruption totale du service possible

> WEAKNESSES

CWE-409

> CWE DETAILED DESCRIPTIONS

CWE-409: Improper Handling of Highly Compressed Data (Data Amplification) - The product does not handle or incorrectly handles a compressed input with a very high compression ratio that produces a large output.

> RED HAT SECURITY ADVISORIES

Red Hat Security Advisory: python-s3transfer security update
An update for python-s3transfer is now available for Red Hat Enterprise Linux 7 Extended Lifecycle Support. Red Hat Product Security has rated this update as having a security impact of Important. A...
Red Hat Security Advisory: resource-agents security update
An update for resource-agents is now available for Red Hat Enterprise Linux 7 Extended Lifecycle Support. Red Hat Product Security has rated this update as having a security impact of Important. A Co...
Red Hat Security Advisory: Red Hat Update Infrastructure 5 security update
The latest release of Red Hat Update Infrastructure. For more details, see the product documentation.
Red Hat Security Advisory: Red Hat multicluster global hub 1.4.4 security update
Red Hat multicluster global hub v1.4.4 general availability release images, which provide security fixes, bug fixes, and updated container images. Red Hat Product Security has rated this update as ha...
Red Hat Security Advisory: Red Hat OpenShift Dev Spaces 3.26.0 Release.
Red Hat OpenShift Dev Spaces 3.26.0 has been released.
Red Hat Security Advisory: Red Hat Quay 3.16.2
Red Hat Quay 3.16.2 is now available with bug fixes.
Red Hat Security Advisory: RHOAI 2.25.2 - Red Hat OpenShift AI
Updated images are now available for Red Hat OpenShift AI.
Red Hat Security Advisory: Red Hat multicluster global hub 1.5.3 security update
Red Hat multicluster global hub v1.5.3 general availability release images, which provide security fixes, bug fixes, and updated container images. Red Hat Product Security has rated this update as ha...
Red Hat Security Advisory: Red Hat Quay 3.10.18
Red Hat Quay 3.10.18 is now available with bug fixes.
Red Hat Security Advisory: Satellite 6.18.3 Async Update
A new release is now available for Red Hat Satellite 6.18 for RHEL 9. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (C...
Red Hat Security Advisory: Red Hat Ceph Storage
A new version of Red Hat build of Ceph Storage has been released
Red Hat Security Advisory: python-urllib3 security update
An update for python-urllib3 is now available for Red Hat Enterprise Linux 8.2 Advanced Update Support. Red Hat Product Security has rated this update as having a security impact of Important. A Comm...
Red Hat Security Advisory: python-urllib3 security update
An update for python-urllib3 is now available for Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions and Red Hat Enterprise Linux 8.8 Telecommunications Update Service. Red Hat Product Se...
Red Hat Security Advisory: python-urllib3 security update
An update for python-urllib3 is now available for Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions, and Red Hat Ent...
Red Hat Security Advisory: python-urllib3 security update
An update for python-urllib3 is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On. Red...
Red Hat Security Advisory: Satellite 6.16.6.1 Async Update
An update is now available for Red Hat Satellite 6.16 for RHEL 8 and RHEL 9. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring Sy...
Red Hat Security Advisory: Satellite 6.17.6.3 Async Update
A new release is now available for Red Hat Satellite 6.17 for RHEL 9.
Red Hat Security Advisory: Red Hat Ceph Storage
A new version of Red Hat build of Ceph Storage has been released
Red Hat Security Advisory: RHTAS 1.2.2 - Red Hat Trusted Artifact Signer Release
The 1.2.2 release of Red Hat Trusted Artifact Signer OpenShift Operator. For more details please visit the product documentation at https://access.redhat.com/documentation/en-us/red_hat_trusted_artifa...
Red Hat Security Advisory: RHTAS 1.2.2 - Red Hat Trusted Artifact Signer Release
The 1.2.2 release of Red Hat Trusted Artifact Signer OpenShift Operator. For more details please visit the product documentation at https://access.redhat.com/documentation/en-us/red_hat_trusted_artifa...
Red Hat Security Advisory: RHTAS 1.2.2 - Red Hat Trusted Artifact Signer Release
The 1.2.2 release of Red Hat Trusted Artifact Signer OpenShift Operator. For more details please visit the product documentation at https://access.redhat.com/documentation/en-us/red_hat_trusted_artifa...
Red Hat Security Advisory: RHTAS 1.2.2 - Red Hat Trusted Artifact Signer Release
The 1.2.2 release of Red Hat Trusted Artifact Signer OpenShift Operator. For more details please visit the product documentation at https://access.redhat.com/documentation/en-us/red_hat_trusted_artifa...
Red Hat Security Advisory: Network Observability 1.11.0 for OpenShift
Network Observability 1.11 for Red Hat OpenShift.
Red Hat Security Advisory: RHTAS - Tech Preview Release Of the Policy Controller Operator
The Tech Preview release of the RHTAS Policy Controller Operator. For more details please visit the product documentation at https://access.redhat.com/documentation/en-us/red_hat_trusted_artifact_sign...
Red Hat Security Advisory: Red Hat OpenShift API for Data Protection
A new version of OpenShift API for Data Protection (OADP) is now available.
Red Hat Security Advisory: New container image: rhceph-9.0
A new version of Red Hat build of Ceph Storage has been released
Red Hat Security Advisory: Red Hat AI Inference Server 3.2.2 (ROCm)
Red Hat AI Inference Server 3.2.2 (ROCm) is now available.
Red Hat Security Advisory: Red Hat AI Inference Server 3.2.2 (CUDA)
Red Hat AI Inference Server 3.2.2 (CUDA) is now available.
Red Hat Security Advisory: RHOAI 2.25.3 - Red Hat OpenShift AI
Updated images are now available for Red Hat OpenShift AI.
Red Hat Security Advisory: RHOAI 3.3 - Red Hat OpenShift AI
Updated images are now available for Red Hat OpenShift AI.
Red Hat Security Advisory: Red Hat OpenShift GitOps v1.18.4 security update
Important: Red Hat OpenShift GitOps v1.18.4 security update
Red Hat Security Advisory: Red Hat OpenShift GitOps v1.17.5 security update
Important: Red Hat OpenShift GitOps v1.17.5 security update
Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.6 Container Release Update
An update is now available for Red Hat Ansible Automation Platform 2.6
Red Hat Security Advisory: RHTAS 1.3.2 - Tech Preview Release of Model Transparency
The Tech Preview release of the RHTAS Model Transparency CLI image. For more details please visit the product documentation at https://access.redhat.com/documentation/en-us/red_hat_trusted_artifact_si...
Red Hat Security Advisory: Red Hat Quay 3.14.6
Red Hat Quay 3.14.6 is now available with bug fixes.
Red Hat Security Advisory: Red Hat Quay 3.13.11
Red Hat Quay 3.13.11 is now available with bug fixes.
Red Hat Security Advisory: RHACS 4.9.4 security and bug fix update
Updated images are now available for Red Hat Advanced Cluster Security (RHACS), which typically include new features, bug fixes, and/or security patches.
Red Hat Security Advisory: RHACS 4.8.9 security and bug fix update
Updated images are now available for Red Hat Advanced Cluster Security (RHACS), which typically include new features, bug fixes, and/or security patches.
Red Hat Security Advisory: RHTAS 1.3.3 - Red Hat Trusted Artifact Signer Release
The 1.3.3 release of Red Hat Trusted Artifact Signer OpenShift Operator. For more details please visit the product documentation at https://access.redhat.com/documentation/en-us/red_hat_trusted_artifa...
Red Hat Security Advisory: Red Hat OpenShift Builds 1.6.4
Red Hat OpenShift Builds 1.6.4
Red Hat Security Advisory: Red Hat OpenShift Builds 1.7.1
Red Hat OpenShift Builds 1.7.1
Red Hat Security Advisory: General availability of the satellite/iop-insights-engine-rhel9 container image
A new satellite/iop-insights-engine-rhel9 container image is now generally available in the Red Hat container registry.
Red Hat Security Advisory: python-urllib3 security update
An update for python-urllib3 is now available for Red Hat Enterprise Linux 7 Extended Lifecycle Support. Red Hat Product Security has rated this update as having a security impact of Important. A Com...
Red Hat Security Advisory: RHOAI 2.25.5 - Red Hat OpenShift AI
Updated images are now available for Red Hat OpenShift AI.
Red Hat Security Advisory: python-urllib3 security update
An update for python-urllib3 is now available for Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION. Red Hat Product Security has rated this update as having a security impact of Imp...
Red Hat Security Advisory: General availability of the satellite/iop-puptoo-rhel9 container image
A new satellite/iop-puptoo-rhel9 container image is now generally available in the Red Hat container registry.
Red Hat Security Advisory: RHOAI 3.3.3 - Red Hat OpenShift AI
Updated images are now available for Red Hat OpenShift AI.
Red Hat Security Advisory: Red Hat OpenStack Platform 17.1 (python-urllib3) security update
An update for python-urllib3 is now available for Red Hat OpenStack Platform 17.1 (Wallaby). Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerab...
Red Hat Security Advisory: Red Hat Openshift Mirror Registry v2.0.11
Red Hat Openshift Mirror Registry v2.0.11
Red Hat Security Advisory: General availability of the satellite/iop-host-inventory-frontend-rhel9 container image
A new satellite/iop-host-inventory-frontend-rhel9 container image is now generally available in the Red Hat container registry.
Red Hat Security Advisory: Red Hat Migration Toolkit for Containers
A new version of Migration Toolkit for Containers (MTC) is now available.
Red Hat Security Advisory: satellite/iop-advisor-engine-rhel9 container image available as a Technology Preview
A new satellite/iop-advisor-engine-rhel9 container image is now available as a Technology Preview in the Red Hat container registry.
Red Hat Security Advisory: satellite/iop-vulnerability-engine-rhel9 container image available as a Technology Preview
A new satellite/iop-vulnerability-engine-rhel9 container image is now available as a Technology Preview in the Red Hat container registry.
Red Hat Security Advisory: RHOAI 3.4.4 - Red Hat OpenShift AI
Updated images are now available for Red Hat OpenShift AI.
Red Hat Security Advisory: Red Hat AI Inference Server Model Optimization Tools 3.2.2 (CUDA)
Red Hat AI Inference Server Model Optimization Tools 3.2.2 (CUDA) is now available.
Red Hat Security Advisory: RHOAI 3.3.7 - Red Hat OpenShift AI
Updated images are now available for Red Hat OpenShift AI.
Red Hat Security Advisory: RHOAI 3.4.5 - Red Hat OpenShift AI
Updated images are now available for Red Hat OpenShift AI.
Red Hat Security Advisory: Red Hat OpenShift Data Foundation 4.19.26 security, enhancement & bug fix update
Red Hat OpenShift Data Foundation 4.19.26 security, enhancement & bug fix update

> GITHUB SECURITY ADVISORY

GHSA-2xpw-w6gg-jr37 HIGH

urllib3 streaming API improperly handles highly compressed data

AFFECTED PACKAGES:
PIP / urllib3
>= 1.0, < 2.6.0
Fixed in: 2.6.0

> HISTORIQUE DES MODIFICATIONS

Première apparition
05/12/2025 17:16
Source: NVD
📊 ENRICHISSEMENT 01/11/2026 06:58
CWE
Champ modifié: Description CWE
Ancienne valeur:
CWE-409: Improper Handling of Highly Compressed Data (Data Amplification) - The product does not handle or incorrectly handles a compressed input with a very high compression ratio that produces a lar...
Nouvelle valeur:
CWE-409: Improper Handling of Highly Compressed Data (Data Amplification) - The product does not handle or incorrectly handles a compressed input with a very high compression ratio t...
📊 ENRICHISSEMENT 19/01/2026 17:37
CVEPROJECT
Champ modifié: CVE Project
Ancienne valeur:
Non
Nouvelle valeur:
Oui
📊 ENRICHISSEMENT 01/01/2026 06:01
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-409: Improper Handling of Highly Compressed Data (Data Amplification) - The product does not handle or incorrectly handles a compressed input with a very high compression ratio that produces a lar...
Total des modifications: 3 Dernière mise à jour: 1 week ago

> REFERENCES

https://github.com/urllib3/urllib3/commit/c19571de34c47de3a766541b041637ba5f716e...
https://github.com/urllib3/urllib3/security/advisories/GHSA-2xpw-w6gg-jr37
« BACK_TO_HOME