CVE Explorer

CVE-2025-66418

urllib3 is a user-friendly HTTP client library for Python. Starting in version 1.24 and prior to 2.6.0, the number of links in the decompression chain was unbounded allowing a malicious server to insert a virtually unlimited number of compression steps leading to high CPU usage and massive memory allocation for the decompressed data. This vulnerability is fixed in 2.6.0.

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:b02b4633f35006e53efe45667b0f896dcd77ca0c18e2813df11d790d7b67ee14

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"product":"urllib3","vendor":"urllib3","versions":[{"status":"affected","version":">= 1.24, < 2.6.0"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:a455eb02c34b9c7fdc4f143301c86e588ab39bdd9825b839033073258732e858 · sha256:25593ef53770c03d… · /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:a455eb02c34b9c7fdc4f143301c86e588ab39bdd9825b839033073258732e858 · sha256:25593ef53770c03d… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion

{"cweId":"CWE-770","description":"CWE-770: Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:a455eb02c34b9c7fdc4f143301c86e588ab39bdd9825b839033073258732e858 · sha256:25593ef53770c03d… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions

{"name":"https://github.com/urllib3/urllib3/commit/24d7b67eac89f94e11003424bcf0d8f7b72222a8","tags":["x_refsource_MISC"],"url":"https://github.com/urllib3/urllib3/commit/24d7b67eac89f94e11003424bcf0d8f7b72222a8"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:a455eb02c34b9c7fdc4f143301c86e588ab39bdd9825b839033073258732e858 · sha256:25593ef53770c03d… · /containers/cna/references/1

{"name":"https://github.com/urllib3/urllib3/security/advisories/GHSA-gm62-xv2j-4w53","tags":["x_refsource_CONFIRM"],"url":"https://github.com/urllib3/urllib3/security/advisories/GHSA-gm62-xv2j-4w53"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:a455eb02c34b9c7fdc4f143301c86e588ab39bdd9825b839033073258732e858 · sha256:25593ef53770c03d… · /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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