Vulnerability · Published May 13, 2026 · Assigned by GitHub_M
CVE-2026-44431urllib3: Sensitive headers forwarded across origins in proxied low-level redirects
High 8.2
In plain English
A high-severity information exposure in urllib3 from urllib3. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 4.0)8.2High
Exploit odds (30 days)0.3%top 73.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
urllib3 is an HTTP client library for Python. From 1.23 to before 2.7.0, cross-origin redirects followed from the low-level API via ProxyManager.connection_from_url().urlopen(..., assert_same_host=False) still forward these sensitive headers. This vulnerability is fixed in 2.7.0.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | fence-agents-aliyun | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-all | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-amt-ws | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-apc | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-apc-snmp | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-aws | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-azure-arm | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-bladecenter | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-brocade | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-cisco-mds | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-cisco-ucs | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-common | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-compute | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-drac5 | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-eaton-snmp | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-emerson | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-eps | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-gce | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-heuristics-ping | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-hpblade | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-ibm-powervs | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-ibm-vpc | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-ibmblade | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-ifmib | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-ilo-moonshot | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-ilo-mp | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-ilo-ssh | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-ilo2 | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-intelmodular | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-ipdu | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-ipmilan | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-kdump | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-kubevirt | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-lpar | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-mpath | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-nutanix-ahv | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-openstack | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-redfish | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-rhevm | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-rsa | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-rsb | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-sbd | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-scsi | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-virsh | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-vmware-rest | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-vmware-soap | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-wti | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:8 | fence-agents-zvm | 4.2.1-129.el8_10.28 | ALSA-2026:49927 |
| AlmaLinux:10 | python3-urllib3 | 1.26.19-4.el10_2 | ALSA-2026:28000 |
| AlmaLinux:8 | python3-urllib3 | 1.24.2-10.el8_10 | ALSA-2026:36732 |
| AlmaLinux:9 | python3-urllib3 | 1.26.5-8.el9_8 | ALSA-2026:28158 |
| AlmaLinux:8 | python3.12-urllib3 | 1.26.19-3.el8_10 | ALSA-2026:32992 |
| AlmaLinux:9 | python3.12-urllib3 | 1.26.19-3.el9_8 | ALSA-2026:28159 |
| AlmaLinux:10 | python3.14-urllib3 | 2.6.3-2.el10_2 | ALSA-2026:27929 |
| AlmaLinux:9 | python3.14-urllib3 | 2.6.3-2.el9_8 | ALSA-2026:28157 |
| AlmaLinux:8 | resource-agents | 4.9.0-54.el8_10.36.alma.1 | ALSA-2026:47126 |
| AlmaLinux:8 | resource-agents-aliyun | 4.9.0-54.el8_10.36.alma.1 | ALSA-2026:47126 |
| AlmaLinux:8 | resource-agents-gcp | 4.9.0-54.el8_10.36.alma.1 | ALSA-2026:47126 |
| AlmaLinux:8 | resource-agents-paf | 4.9.0-54.el8_10.36.alma.1 | ALSA-2026:47126 |
| Debian:12 | python-urllib3 | 1.26.12-1+deb12u4 | DEBIAN-CVE-2026-44431 |
| Debian:13 | python-urllib3 | 2.3.0-3+deb13u2 | DEBIAN-CVE-2026-44431 |
| Debian:14 | python-urllib3 | 2.7.0-1 | DEBIAN-CVE-2026-44431 |
| PyPI | urllib3 | 2.7.0 | PYSEC-2026-141 |
| PyPI | urllib3 | 2.7.0 | GHSA-qccp-gfcp-xxvc |
| Rocky Linux:8 | fence-agents | 0:4.2.1-129.el8_10.28 | RLSA-2026:49927 |
| Rocky Linux:10 | python-urllib3 | 0:1.26.19-4.el10_2 | RLSA-2026:28000 |
| Rocky Linux:8 | python-urllib3 | 0:1.24.2-10.el8_10 | RLSA-2026:36732 |
| Rocky Linux:9 | python-urllib3 | 0:1.26.5-8.el9_8 | RLSA-2026:28158 |
| Rocky Linux:8 | python3.12-urllib3 | 0:1.26.19-3.el8_10 | RLSA-2026:32992 |
| Rocky Linux:9 | python3.12-urllib3 | 0:1.26.19-3.el9_8 | RLSA-2026:28159 |
| Rocky Linux:10 | python3.14-urllib3 | 0:2.6.3-2.el10_2 | RLSA-2026:27929 |
| Rocky Linux:9 | python3.14-urllib3 | 0:2.6.3-2.el9_8 | RLSA-2026:28157 |
| Rocky Linux:8 | resource-agents | 0:4.9.0-54.el8_10.36 | RLSA-2026:47126 |
| Ubuntu:25.10 | python-pip | no fix listed | UBUNTU-CVE-2026-44431 |
| Ubuntu:26.10 | python-pip | no fix listed | UBUNTU-CVE-2026-44431 |
| Ubuntu:22.04:LTS | python-urllib3 | 1.26.5-1~exp1ubuntu0.7 | UBUNTU-CVE-2026-44431 |
| Ubuntu:24.04:LTS | python-urllib3 | 2.0.7-1ubuntu0.7 | UBUNTU-CVE-2026-44431 |
| Ubuntu:25.10 | python-urllib3 | 2.3.0-3ubuntu0.6 | UBUNTU-CVE-2026-44431 |
| Ubuntu:26.04:LTS | python-urllib3 | 2.6.3-1ubuntu1.1 | UBUNTU-CVE-2026-44431 |
Affected products (as reported)
Weakness: CWE-200 · 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