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CVE-2026-9375

urllib3 version 2.6.3 is vulnerable to a decompression bomb bypass in its streaming API (`preload_content=False`) when using Brotli support. The issue arises due to three independent code paths in `response.py` that bypass the `max_length` protection introduced in version 2.6.0 to mitigate CVE-2025-66471. Specifically, negative `max_length` values can be produced due to buffer arithmetic in `read()`, `flush_decoder` unconditionally overrides `max_length` to `-1`, and `_flush_decoder()` passes no
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:f0ce80f0ae6dace23ab11616b7f51964a783c5ee61d050e932b8f0bb7ebdfc4d
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"urllib3/urllib3","vendor":"urllib3","versions":[{"lessThan":"2.7.0","status":"affected","version":"unspecified","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:6d57bb3d0b7d11d4a11c1ca9a53206711443d933e45c01b19bb88c365af26960 · sha256:ad41156f9981a258… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.0"},"metric_type":"cvssV3_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:6d57bb3d0b7d11d4a11c1ca9a53206711443d933e45c01b19bb88c365af26960 · sha256:ad41156f9981a258… · /containers/cna/metrics/0/cvssV3_0

CWE assertions

1 source assertion
{"cweId":"CWE-400","description":"CWE-400 Uncontrolled Resource Consumption","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:6d57bb3d0b7d11d4a11c1ca9a53206711443d933e45c01b19bb88c365af26960 · sha256:ad41156f9981a258… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"url":"https://github.com/urllib3/urllib3/commit/2bdcc44d1e163fb5cc48a8662425e35e15adfe6a"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6d57bb3d0b7d11d4a11c1ca9a53206711443d933e45c01b19bb88c365af26960 · sha256:ad41156f9981a258… · /containers/cna/references/1
{"url":"https://huntr.com/bounties/ddd09eb9-b87d-4a43-84df-48837b1bbc23"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6d57bb3d0b7d11d4a11c1ca9a53206711443d933e45c01b19bb88c365af26960 · sha256:ad41156f9981a258… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://huntr.com/bounties/ddd09eb9-b87d-4a43-84df-48837b1bbc23"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6d57bb3d0b7d11d4a11c1ca9a53206711443d933e45c01b19bb88c365af26960 · sha256:ad41156f9981a258… · /containers/adp/0/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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