CVE-2025-66471
urllib3 Streaming API improperly handles highly compressed data
02 Description
urllib3 Streaming API improperly handles highly compressed data
03 Exploitation and scoring
- Exploitation
- Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
- SSVC decision
- ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
- AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
- Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
- EPSS probability
- 0.68% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 51.9% of scored records. A rank, not a probability.
- NVD base score
- 8.9 (CVSS v4.0), scored by the NVD independently of the CNA.
- NVD 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
- NVD analysis status
- Analyzed. NVD last modified this record on 2026-09-25.
- Red Hat severity
- Important. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2025-12-05 16:06Z10 MO AGO
- Last updated
- 2025-12-05 19:33Z10 MO AGO
- Reserved
- 2025-12-02
- Assigning CNA
- GitHub_M
- Record state
- PUBLISHED
- Severity
- High (CVSS 8.9)
- CNA 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
- Weaknesses
- CWE-409Improper Handling of Highly Compressed Data (Data Amplification)Base
- Data version
- 5.2
- Document digest
- 431de0f4a3aeab51447806b72da736e7afbdccb722318261fc4a6f3cd95464a3
05 Affected products
06 References
07 Fixed in
AlmaLinux 8
- fence-agents-aliyun Fixed in 4.2.1-129.el8_10.20
- fence-agents-all Fixed in 4.2.1-129.el8_10.20
- fence-agents-amt-ws Fixed in 4.2.1-129.el8_10.20
- fence-agents-apc Fixed in 4.2.1-129.el8_10.20
- fence-agents-apc-snmp Fixed in 4.2.1-129.el8_10.20
- fence-agents-aws Fixed in 4.2.1-129.el8_10.20
- fence-agents-azure-arm Fixed in 4.2.1-129.el8_10.20
- fence-agents-bladecenter Fixed in 4.2.1-129.el8_10.20
- fence-agents-brocade Fixed in 4.2.1-129.el8_10.20
- fence-agents-cisco-mds Fixed in 4.2.1-129.el8_10.20
- fence-agents-cisco-ucs Fixed in 4.2.1-129.el8_10.20
- fence-agents-common Fixed in 4.2.1-129.el8_10.20
- fence-agents-compute Fixed in 4.2.1-129.el8_10.20
- fence-agents-drac5 Fixed in 4.2.1-129.el8_10.20
- fence-agents-eaton-snmp Fixed in 4.2.1-129.el8_10.20
- fence-agents-emerson Fixed in 4.2.1-129.el8_10.20
- fence-agents-eps Fixed in 4.2.1-129.el8_10.20
- fence-agents-gce Fixed in 4.2.1-129.el8_10.20
- fence-agents-heuristics-ping Fixed in 4.2.1-129.el8_10.20
- fence-agents-hpblade Fixed in 4.2.1-129.el8_10.20
- fence-agents-ibm-powervs Fixed in 4.2.1-129.el8_10.20
- fence-agents-ibm-vpc Fixed in 4.2.1-129.el8_10.20
- fence-agents-ibmblade Fixed in 4.2.1-129.el8_10.20
- fence-agents-ifmib Fixed in 4.2.1-129.el8_10.20
- fence-agents-ilo-moonshot Fixed in 4.2.1-129.el8_10.20
- fence-agents-ilo-mp Fixed in 4.2.1-129.el8_10.20
- fence-agents-ilo-ssh Fixed in 4.2.1-129.el8_10.20
- fence-agents-ilo2 Fixed in 4.2.1-129.el8_10.20
- fence-agents-intelmodular Fixed in 4.2.1-129.el8_10.20
- fence-agents-ipdu Fixed in 4.2.1-129.el8_10.20
- fence-agents-ipmilan Fixed in 4.2.1-129.el8_10.20
- fence-agents-kdump Fixed in 4.2.1-129.el8_10.20
- fence-agents-kubevirt Fixed in 4.2.1-129.el8_10.20
- fence-agents-lpar Fixed in 4.2.1-129.el8_10.20
- fence-agents-mpath Fixed in 4.2.1-129.el8_10.20
- fence-agents-nutanix-ahv Fixed in 4.2.1-129.el8_10.20
- fence-agents-openstack Fixed in 4.2.1-129.el8_10.20
- fence-agents-redfish Fixed in 4.2.1-129.el8_10.20
- fence-agents-rhevm Fixed in 4.2.1-129.el8_10.20
- fence-agents-rsa Fixed in 4.2.1-129.el8_10.20
15 further packages in AlmaLinux 8 not shown (first 40 listed).
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
AlmaLinux 9
- fence-agents-aliyun Fixed in 4.10.0-98.el9_7.4
- fence-agents-all Fixed in 4.10.0-98.el9_7.4
- fence-agents-amt-ws Fixed in 4.10.0-98.el9_7.4
- fence-agents-apc Fixed in 4.10.0-98.el9_7.4
- fence-agents-apc-snmp Fixed in 4.10.0-98.el9_7.4
- fence-agents-aws Fixed in 4.10.0-98.el9_7.4
- fence-agents-azure-arm Fixed in 4.10.0-98.el9_7.4
- fence-agents-bladecenter Fixed in 4.10.0-98.el9_7.4
- fence-agents-brocade Fixed in 4.10.0-98.el9_7.4
- fence-agents-cisco-mds Fixed in 4.10.0-98.el9_7.4
- fence-agents-cisco-ucs Fixed in 4.10.0-98.el9_7.4
- fence-agents-common Fixed in 4.10.0-98.el9_7.4
- fence-agents-compute Fixed in 4.10.0-98.el9_7.4
- fence-agents-drac5 Fixed in 4.10.0-98.el9_7.4
- fence-agents-eaton-snmp Fixed in 4.10.0-98.el9_7.4
- fence-agents-emerson Fixed in 4.10.0-98.el9_7.4
- fence-agents-eps Fixed in 4.10.0-98.el9_7.4
- fence-agents-gce Fixed in 4.10.0-98.el9_7.4
- fence-agents-heuristics-ping Fixed in 4.10.0-98.el9_7.4
- fence-agents-hpblade Fixed in 4.10.0-98.el9_7.4
- fence-agents-ibm-powervs Fixed in 4.10.0-98.el9_7.4
- fence-agents-ibm-vpc Fixed in 4.10.0-98.el9_7.4
- fence-agents-ibmblade Fixed in 4.10.0-98.el9_7.4
- fence-agents-ifmib Fixed in 4.10.0-98.el9_7.4
- fence-agents-ilo-moonshot Fixed in 4.10.0-98.el9_7.4
- fence-agents-ilo-mp Fixed in 4.10.0-98.el9_7.4
- fence-agents-ilo-ssh Fixed in 4.10.0-98.el9_7.4
- fence-agents-ilo2 Fixed in 4.10.0-98.el9_7.4
- fence-agents-intelmodular Fixed in 4.10.0-98.el9_7.4
- fence-agents-ipdu Fixed in 4.10.0-98.el9_7.4
- fence-agents-ipmilan Fixed in 4.10.0-98.el9_7.4
- fence-agents-kdump Fixed in 4.10.0-98.el9_7.4
- fence-agents-kubevirt Fixed in 4.10.0-98.el9_7.4
- fence-agents-lpar Fixed in 4.10.0-98.el9_7.4
- fence-agents-mpath Fixed in 4.10.0-98.el9_7.4
- fence-agents-nutanix-ahv Fixed in 4.10.0-98.el9_7.4
- fence-agents-openstack Fixed in 4.10.0-98.el9_7.4
- fence-agents-redfish Fixed in 4.10.0-98.el9_7.4
- fence-agents-rhevm Fixed in 4.10.0-98.el9_7.4
- fence-agents-rsa Fixed in 4.10.0-98.el9_7.4
19 further packages in AlmaLinux 9 not shown (first 40 listed).
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
AlmaLinux 10
- python3-urllib3 Fixed in 1.26.19-2.el10_1.1
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 8
- fence-agents-aliyun Fixed in 4.2.1-129.el8_10.20
- fence-agents-all Fixed in 4.2.1-129.el8_10.20
- fence-agents-amt-ws Fixed in 4.2.1-129.el8_10.20
- fence-agents-apc Fixed in 4.2.1-129.el8_10.20
- fence-agents-apc-snmp Fixed in 4.2.1-129.el8_10.20
- fence-agents-aws Fixed in 4.2.1-129.el8_10.20
- fence-agents-azure-arm Fixed in 4.2.1-129.el8_10.20
- fence-agents-bladecenter Fixed in 4.2.1-129.el8_10.20
- fence-agents-brocade Fixed in 4.2.1-129.el8_10.20
- fence-agents-cisco-mds Fixed in 4.2.1-129.el8_10.20
- fence-agents-cisco-ucs Fixed in 4.2.1-129.el8_10.20
- fence-agents-common Fixed in 4.2.1-129.el8_10.20
- fence-agents-compute Fixed in 4.2.1-129.el8_10.20
- fence-agents-drac5 Fixed in 4.2.1-129.el8_10.20
- fence-agents-eaton-snmp Fixed in 4.2.1-129.el8_10.20
- fence-agents-emerson Fixed in 4.2.1-129.el8_10.20
- fence-agents-eps Fixed in 4.2.1-129.el8_10.20
- fence-agents-gce Fixed in 4.2.1-129.el8_10.20
- fence-agents-heuristics-ping Fixed in 4.2.1-129.el8_10.20
- fence-agents-hpblade Fixed in 4.2.1-129.el8_10.20
- fence-agents-ibm-powervs Fixed in 4.2.1-129.el8_10.20
- fence-agents-ibm-vpc Fixed in 4.2.1-129.el8_10.20
- fence-agents-ibmblade Fixed in 4.2.1-129.el8_10.20
- fence-agents-ifmib Fixed in 4.2.1-129.el8_10.20
- fence-agents-ilo-moonshot Fixed in 4.2.1-129.el8_10.20
- fence-agents-ilo-mp Fixed in 4.2.1-129.el8_10.20
- fence-agents-ilo-ssh Fixed in 4.2.1-129.el8_10.20
- fence-agents-ilo2 Fixed in 4.2.1-129.el8_10.20
- fence-agents-intelmodular Fixed in 4.2.1-129.el8_10.20
- fence-agents-ipdu Fixed in 4.2.1-129.el8_10.20
- fence-agents-ipmilan Fixed in 4.2.1-129.el8_10.20
- fence-agents-kdump Fixed in 4.2.1-129.el8_10.20
- fence-agents-kubevirt Fixed in 4.2.1-129.el8_10.20
- fence-agents-lpar Fixed in 4.2.1-129.el8_10.20
- fence-agents-mpath Fixed in 4.2.1-129.el8_10.20
- fence-agents-nutanix-ahv Fixed in 4.2.1-129.el8_10.20
- fence-agents-openstack Fixed in 4.2.1-129.el8_10.20
- fence-agents-redfish Fixed in 4.2.1-129.el8_10.20
- fence-agents-rhevm Fixed in 4.2.1-129.el8_10.20
- fence-agents-rsa Fixed in 4.2.1-129.el8_10.20
15 further packages in CloudLinux 8 not shown (first 40 listed).
Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 9
- fence-agents-aliyun Fixed in 4.10.0-98.el9_7.4
- fence-agents-all Fixed in 4.10.0-98.el9_7.4
- fence-agents-amt-ws Fixed in 4.10.0-98.el9_7.4
- fence-agents-apc Fixed in 4.10.0-98.el9_7.4
- fence-agents-apc-snmp Fixed in 4.10.0-98.el9_7.4
- fence-agents-aws Fixed in 4.10.0-98.el9_7.4
- fence-agents-azure-arm Fixed in 4.10.0-98.el9_7.4
- fence-agents-bladecenter Fixed in 4.10.0-98.el9_7.4
- fence-agents-brocade Fixed in 4.10.0-98.el9_7.4
- fence-agents-cisco-mds Fixed in 4.10.0-98.el9_7.4
- fence-agents-cisco-ucs Fixed in 4.10.0-98.el9_7.4
- fence-agents-common Fixed in 4.10.0-98.el9_7.4
- fence-agents-compute Fixed in 4.10.0-98.el9_7.4
- fence-agents-drac5 Fixed in 4.10.0-98.el9_7.4
- fence-agents-eaton-snmp Fixed in 4.10.0-98.el9_7.4
- fence-agents-emerson Fixed in 4.10.0-98.el9_7.4
- fence-agents-eps Fixed in 4.10.0-98.el9_7.4
- fence-agents-gce Fixed in 4.10.0-98.el9_7.4
- fence-agents-heuristics-ping Fixed in 4.10.0-98.el9_7.4
- fence-agents-hpblade Fixed in 4.10.0-98.el9_7.4
- fence-agents-ibm-powervs Fixed in 4.10.0-98.el9_7.4
- fence-agents-ibm-vpc Fixed in 4.10.0-98.el9_7.4
- fence-agents-ibmblade Fixed in 4.10.0-98.el9_7.4
- fence-agents-ifmib Fixed in 4.10.0-98.el9_7.4
- fence-agents-ilo-moonshot Fixed in 4.10.0-98.el9_7.4
- fence-agents-ilo-mp Fixed in 4.10.0-98.el9_7.4
- fence-agents-ilo-ssh Fixed in 4.10.0-98.el9_7.4
- fence-agents-ilo2 Fixed in 4.10.0-98.el9_7.4
- fence-agents-intelmodular Fixed in 4.10.0-98.el9_7.4
- fence-agents-ipdu Fixed in 4.10.0-98.el9_7.4
- fence-agents-ipmilan Fixed in 4.10.0-98.el9_7.4
- fence-agents-kdump Fixed in 4.10.0-98.el9_7.4
- fence-agents-kubevirt Fixed in 4.10.0-98.el9_7.4
- fence-agents-lpar Fixed in 4.10.0-98.el9_7.4
- fence-agents-mpath Fixed in 4.10.0-98.el9_7.4
- fence-agents-nutanix-ahv Fixed in 4.10.0-98.el9_7.4
- fence-agents-openstack Fixed in 4.10.0-98.el9_7.4
- fence-agents-redfish Fixed in 4.10.0-98.el9_7.4
- fence-agents-rhevm Fixed in 4.10.0-98.el9_7.4
- fence-agents-rsa Fixed in 4.10.0-98.el9_7.4
19 further packages in CloudLinux 9 not shown (first 40 listed).
Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 10
- python3-urllib3 Fixed in 1.26.19-2.el10_1.1
Derived from AlmaLinux 10. Partial coverage: only packages taken from AlmaLinux 10 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Debian 12
- python-urllib3 No fix yet
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- python-urllib3 No fix yet
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- python-urllib3 Fixed in 2.6.3-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 22.04 LTS
- python-urllib3 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 24.04 LTS
- python-urllib3 Fixed in 2.0.7-1ubuntu0.3
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 25.10
- python-pip No fix yet
- python-urllib3 Fixed in 2.3.0-3ubuntu0.1
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 26.04 LTS
- python-urllib3 Fixed in 2.5.0-1ubuntu1
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 26.10
- python-pip No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 14.04 LTS
- python-pip No fix yet
- python-urllib3 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 16.04 LTS
- python-pip No fix yet
- python-urllib3 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 18.04 LTS
- python-pip No fix yet
- python-urllib3 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 20.04 LTS
- python-pip No fix yet
- python-urllib3 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 22.04 LTS
- python-pip Fixed in 22.0.2+dfsg-1ubuntu0.7+esm3Available with Ubuntu Pro: https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 24.04 LTS
- python-pip Fixed in 24.0+dfsg-1ubuntu1.3+esm3Available with Ubuntu Pro: https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 26.04 LTS
- python-pip Fixed in 25.1.1+dfsg-1ubuntu2+esm3Available with Ubuntu Pro: https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.