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CVE-2025-66471

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, b
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:45db7909d5579de9b02b175b8b0d4db4291f39b16ff448eb84079a56da4303ee
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":">= 1.0, < 2.6.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:dfef9ca1287b900620acc7f913c8b307d044c2a737d7a1dcc5cde64eb80abea0 · sha256:431de0f4a3aeab51… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":8.9,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:dfef9ca1287b900620acc7f913c8b307d044c2a737d7a1dcc5cde64eb80abea0 · sha256:431de0f4a3aeab51… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-409","description":"CWE-409: Improper Handling of Highly Compressed Data (Data Amplification)","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:dfef9ca1287b900620acc7f913c8b307d044c2a737d7a1dcc5cde64eb80abea0 · sha256:431de0f4a3aeab51… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/urllib3/urllib3/commit/c19571de34c47de3a766541b041637ba5f716ed7","tags":["x_refsource_MISC"],"url":"https://github.com/urllib3/urllib3/commit/c19571de34c47de3a766541b041637ba5f716ed7"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:dfef9ca1287b900620acc7f913c8b307d044c2a737d7a1dcc5cde64eb80abea0 · sha256:431de0f4a3aeab51… · /containers/cna/references/1
{"name":"https://github.com/urllib3/urllib3/security/advisories/GHSA-2xpw-w6gg-jr37","tags":["x_refsource_CONFIRM"],"url":"https://github.com/urllib3/urllib3/security/advisories/GHSA-2xpw-w6gg-jr37"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:dfef9ca1287b900620acc7f913c8b307d044c2a737d7a1dcc5cde64eb80abea0 · sha256:431de0f4a3aeab51… · /containers/cna/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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