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CVE-2026-44431

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.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:660692049f734eabc2eda2e7417557aa6a3e53da98102211503f835988ea4418
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"urllib3","vendor":"urllib3","versions":[{"status":"affected","version":">= 1.23, < 2.7.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:bc7b7342e690e5386f1c9f6d9c2c50af42c93eec6b492c0c9e697be97c422a5e · sha256:ed2b42da600352c8… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":8.2,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:bc7b7342e690e5386f1c9f6d9c2c50af42c93eec6b492c0c9e697be97c422a5e · sha256:ed2b42da600352c8… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-200","description":"CWE-200: Exposure of Sensitive Information to an Unauthorized Actor","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:bc7b7342e690e5386f1c9f6d9c2c50af42c93eec6b492c0c9e697be97c422a5e · sha256:ed2b42da600352c8… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/urllib3/urllib3/security/advisories/GHSA-qccp-gfcp-xxvc","tags":["x_refsource_CONFIRM"],"url":"https://github.com/urllib3/urllib3/security/advisories/GHSA-qccp-gfcp-xxvc"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:bc7b7342e690e5386f1c9f6d9c2c50af42c93eec6b492c0c9e697be97c422a5e · sha256:ed2b42da600352c8… · /containers/cna/references/0
{"url":"https://lists.debian.org/debian-lts-announce/2026/06/msg00040.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:bc7b7342e690e5386f1c9f6d9c2c50af42c93eec6b492c0c9e697be97c422a5e · sha256:ed2b42da600352c8… · /containers/adp/1/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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