synced 1 MIN AGO
01 Record

CVE-2026-44431

urllib3: Sensitive headers forwarded across origins in proxied low-level redirects

HighPUBLISHEDCNA: GitHub_M
CNA base score8.2 CVSS v4.0CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
View raw JSON

02 Description

urllib3: Sensitive headers forwarded across origins in proxied low-level redirects

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.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.33% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 26.0% of scored records. A rank, not a probability.
NVD base score
8.2 (CVSS v4.0), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/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
Modified. NVD last modified this record on 2026-06-26.
Red Hat severity
Moderate. 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
2026-05-13 15:20Z5 MO AGO
Last updated
2026-06-26 11:01Z4 MO AGO
Reserved
2026-05-06
Assigning CNA
GitHub_M
Record state
PUBLISHED
Severity
High (CVSS 8.2)
CNA CVSS vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Weaknesses
  • CWE-200Exposure of Sensitive Information to an Unauthorized ActorClass
  • CWE-201Insertion of Sensitive Information Into Sent DataBase
Data version
5.2
Document digest
ed2b42da600352c88acb738053241a8ae83f4300a87339a3b1216a073ee91e69

05 Affected products

VendorProductVersionsPlatforms
urllib3urllib3>= 1.23, < 2.7.0—

06 References

07 Fixed in

AlmaLinux 8

  • fence-agents-aliyun
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-all
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-amt-ws
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-apc
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-apc-snmp
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-aws
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-azure-arm
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-bladecenter
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-brocade
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-cisco-mds
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-cisco-ucs
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-common
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-compute
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-drac5
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-eaton-snmp
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-emerson
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-eps
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-gce
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-heuristics-ping
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-hpblade
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-ibm-powervs
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-ibm-vpc
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-ibmblade
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-ifmib
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-ilo-moonshot
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-ilo-mp
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-ilo-ssh
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-ilo2
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-intelmodular
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-ipdu
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-ipmilan
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-kdump
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-kubevirt
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-lpar
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-mpath
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-nutanix-ahv
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-openstack
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-redfish
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-rhevm
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-rsa
    Fixed in 4.2.1-129.el8_10.28

14 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

  • python3-urllib3
    Fixed in 1.26.5-8.el9_8
  • python3.12-urllib3
    Fixed in 1.26.19-3.el9_8
  • python3.14-urllib3
    Fixed in 2.6.3-2.el9_8

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 1.26.19-4.el10_2
  • python3.14-urllib3
    Fixed in 2.6.3-2.el10_2

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_10.28
  • fence-agents-all
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-amt-ws
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-apc
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-apc-snmp
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-aws
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-azure-arm
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-bladecenter
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-brocade
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-cisco-mds
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-cisco-ucs
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-common
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-compute
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-drac5
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-eaton-snmp
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-emerson
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-eps
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-gce
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-heuristics-ping
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-hpblade
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-ibm-powervs
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-ibm-vpc
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-ibmblade
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-ifmib
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-ilo-moonshot
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-ilo-mp
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-ilo-ssh
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-ilo2
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-intelmodular
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-ipdu
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-ipmilan
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-kdump
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-kubevirt
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-lpar
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-mpath
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-nutanix-ahv
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-openstack
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-redfish
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-rhevm
    Fixed in 4.2.1-129.el8_10.28
  • fence-agents-rsa
    Fixed in 4.2.1-129.el8_10.28

14 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

  • python3-urllib3
    Fixed in 1.26.5-8.el9_8
  • python3.12-urllib3
    Fixed in 1.26.19-3.el9_8
  • python3.14-urllib3
    Fixed in 2.6.3-2.el9_8

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 1.26.19-4.el10_2
  • python3.14-urllib3
    Fixed in 2.6.3-2.el10_2

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
    Fixed in 1.26.12-1+deb12u4

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • python-urllib3
    Fixed in 2.3.0-3+deb13u2

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • python-urllib3
    Fixed in 2.7.0-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 22.04 LTS

  • python-urllib3
    Fixed in 1.26.5-1~exp1ubuntu0.7

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 2.0.7-1ubuntu0.7

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 2.3.0-3ubuntu0.6

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 2.6.3-1ubuntu1.1

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
    Fixed in 1.13.1-2ubuntu0.16.04.4+esm4
    Available with Ubuntu Pro with Legacy support add-on: 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 18.04 LTS

  • python-pip
    No fix yet
  • python-urllib3
    Fixed in 1.22-1ubuntu0.18.04.2+esm4
    Available with Ubuntu Pro (Infra-only): 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 20.04 LTS

  • python-pip
    No fix yet
  • python-urllib3
    Fixed in 1.25.8-2ubuntu0.4+esm5
    Available with Ubuntu Pro (Infra-only): 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 22.04 LTS

  • 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 24.04 LTS

  • 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 26.04 LTS

  • python-pip
    No fix yet

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.