{"id":"CVE-2026-97688","revision":null,"records":[{"revision":"babe72b149bf4079a6524e2956715ea7","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-97688","aliases":[],"title":"urllib3: Chunked Deflate streaming can enter an infinite loop","description":"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.","state":0,"publishedAt":"2026-09-29T15:32:17.622+00:00","modifiedAt":"2026-09-29T15:42:34.502+00:00","affected":[{"ecosystem":"Vendor product","name":"urllib3","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"urllib3\",\n                    \"product\": \"urllib3\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 2.6.2, < 2.8.0\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"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","score":6.9,"severity":"MEDIUM"}],"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"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-97688","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-97688","identifiers":["CVE-2026-97688"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-11-12T06:54:08.8081877+00:00","complete":true,"records":1779,"lastAttemptAt":"2026-11-12T06:54:08.8081877+00:00","lastSuccessAt":"2026-11-12T06:54:09.4926633+00:00","error":null,"lastVerifiedAt":"2026-11-12T06:54:09.4926642+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"cve-program","scope":"Official CVE Program baseline and cumulative hourly delta; all vendors, published and rejected records","generation":"cve-64752486c567b55b31fb0d7225f5222bcd0019564ac0ac5f0649e242c7b19299-031557bd84075d0efeb8f81d38e7e201c5767c1ec5ad4deb9375464dfdb790d3","complete":true,"records":424595,"lastAttemptAt":"2026-11-12T06:53:59.6712569+00:00","lastSuccessAt":"2026-11-12T06:53:59.6124706+00:00","error":null,"lastVerifiedAt":"2026-11-12T06:53:59.6712569+00:00","snapshotPublishedAt":"2026-11-12T06:27:50+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"euvd","scope":"Rolling EUVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-570328139368428ca550af1570d01579","complete":true,"records":13760,"lastAttemptAt":"2026-11-12T06:55:06.9273282+00:00","lastSuccessAt":"2026-11-12T06:55:06.923+00:00","error":null,"lastVerifiedAt":"2026-11-12T06:55:06.923+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13813,"expectedIdentifiers":13813,"failedIdentifiers":0},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-12T06:54:08.8081877+00:00","complete":true,"records":1097,"lastAttemptAt":"2026-11-12T06:54:08.8081877+00:00","lastSuccessAt":"2026-11-12T06:54:09.7509822+00:00","error":null,"lastVerifiedAt":"2026-11-12T06:54:09.7509833+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-5bd6a0be90c14da3820334c987af617f","complete":true,"records":13760,"lastAttemptAt":"2026-11-12T06:54:37.2126404+00:00","lastSuccessAt":"2026-11-12T06:54:37.209+00:00","error":null,"lastVerifiedAt":"2026-11-12T06:54:37.209+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13813,"expectedIdentifiers":13813,"failedIdentifiers":0},{"source":"osv:Go","scope":"Complete OSV Go ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"go-3562b6c78fd1bd0f0b55daf66a0926ae24f65e462df7f6d928caad458fc696bf","complete":true,"records":9947,"lastAttemptAt":"2026-11-12T06:54:07.7500838+00:00","lastSuccessAt":"2026-11-11T04:27:43.6877707+00:00","error":null,"lastVerifiedAt":"2026-11-12T06:54:07.7500838+00:00","snapshotPublishedAt":"2026-11-11T03:32:46+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:NuGet","scope":"Complete OSV NuGet ecosystem archive, including GitHub Advisory Database records; NuGet version matching only","generation":"nuget-456002455e0ab94bb92c95476d4e6d175c104cd594749982afd96c893728ecbc","complete":true,"records":2010,"lastAttemptAt":"2026-11-12T06:54:05.0323741+00:00","lastSuccessAt":"2026-11-11T02:36:58.1276999+00:00","error":null,"lastVerifiedAt":"2026-11-12T06:54:05.0323741+00:00","snapshotPublishedAt":"2026-11-11T01:17:51+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:crates.io","scope":"Complete OSV crates.io ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"crates.io-baa8362b4daf9e5f39d5563775a55935e7b442c0735d33274a921579ce4a0d66","complete":true,"records":3093,"lastAttemptAt":"2026-11-12T06:54:08.5688182+00:00","lastSuccessAt":"2026-11-11T13:00:02.5446881+00:00","error":null,"lastVerifiedAt":"2026-11-12T06:54:08.5688182+00:00","snapshotPublishedAt":"2026-11-11T12:47:47+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:npm","scope":"Complete OSV npm ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"npm-eb5176d73e87a862c4cae7484f3fd31f7d170139114b3e99e25926d661f6435b","complete":true,"records":231700,"lastAttemptAt":"2026-11-12T06:54:05.6319464+00:00","lastSuccessAt":"2026-11-12T05:58:39.2691741+00:00","error":null,"lastVerifiedAt":"2026-11-12T06:54:05.6319464+00:00","snapshotPublishedAt":"2026-11-12T05:48:10+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null}]}