{"schema_version":"1","data":[{"id":3791,"advisory_id":"0792da6c-059d-48e2-b4d6-d28c5865d575","revision":1,"source_id":"core-cve","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97688","source_published_at":"2026-09-29T15:32:17.622+00:00","published_at":"2026-10-24T21:40:47.562074+00:00","extraction_method":"structured","technologies":["core-cve","urllib3"],"cve_ids":["CVE-2026-97688"],"event_types":["advisory"],"payload":{"kind":"advisory","title":"urllib3: Chunked Deflate streaming can enter an infinite loop","summary":"urllib3 is an HTTP client library for Python. From 2.6.2 until 2.8.0, HTTPResponse.stream and HTTPResponse.read_chunked can enter an infinite loop because the Deflate decoder retains trailing bytes as unconsumed input after reaching end-of-stream and repeatedly decodes them without progress. The issue occurs when an untrusted server sends a chunked Deflate response whose decoded body exceeds a positive finite chunk size and whose encoded body has trailing bytes, specifically a response with Transfer-Encoding: chunked and Content-Encoding: deflate, content decoding enabled, and the positive finite amt=N streaming chunk size. The attack mechanism is that a malicious server returns a compressed chunked response with trailing bytes after the Deflate stream. The impact is excessive CPU usage and a request that does not complete, and network read timeouts do not interrupt the loop because no further socket read occurs. This issue is fixed in version 2.8.0.","evidence":"cve:CVE-2026-97688","products":[{"name":{"value":"urllib3","evidence":"/containers/cna/affected/0/product"},"prerequisites":[],"fixed_versions":[],"affected_versions":[]}],"severity":"medium","structured":{"id":"CVE-2026-97688","aliases":["CVE-2026-97688"],"metrics":[{"cvssV4_0":{"version":"4.0","baseScore":6.9,"attackVector":"NETWORK","baseSeverity":"MEDIUM","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","userInteraction":"NONE","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","subIntegrityImpact":"NONE","vulnIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","vulnAvailabilityImpact":"LOW","subConfidentialityImpact":"NONE","vulnConfidentialityImpact":"NONE"}}],"affected":[{"vendor":"urllib3","product":"urllib3","versions":[{"status":"affected","version":">= 2.6.2, < 2.8.0"}]}],"modified":"2026-09-29T15:42:34.502Z","provider":"cve","references":["https://github.com/urllib3/urllib3/security/advisories/GHSA-gh4c-6fx4-qh6g","https://github.com/urllib3/urllib3/commit/ea2ad7b21a80da3632f80016526a18864586077f","https://github.com/urllib3/urllib3/releases/tag/2.8.0"],"provider_metadata":{"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-97688","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-09-29T15:42:28.931695Z"}}}],"providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-29T15:42:34.502Z"}}],"cna":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-09-29T15:32:17.622Z"}}},"related_cves":[{"value":"CVE-2026-97688","evidence":"/cveMetadata/cveId"}],"security_relevant":true,"severity_evidence":"/containers/cna/metrics"},"priority":{"reasons":[],"severity":"medium","linked_cves":[],"fix_available":false,"known_exploited":false,"publisher_severity":"medium"},"context_update":false}],"next_after":3791,"next_before":3791}