{"id":"CVE-2026-44432","summary":"urllib3: Decompression-bomb safeguards bypassed in parts of the streaming API","details":"urllib3 is an HTTP client library for Python. From 2.6.0 to before 2.7.0, urllib3 could decompress the whole response instead of the requested portion (1) during the second HTTPResponse.read(amt=N) call when the response was decompressed using the official Brotli library or (2) when HTTPResponse.drain_conn() was called after the response had been read and decompressed partially (compression algorithm did not matter here). These issues could cause urllib3 to fully decode a small amount of highly compressed data in a single operation. This could result in excessive resource consumption (high CPU usage and massive memory allocation for the decompressed data) on the client side. This vulnerability is fixed in 2.7.0.","aliases":["GHSA-mf9v-mfxr-j63j","PYSEC-2026-142"],"modified":"2026-07-24T03:56:46.804160931Z","published":"2026-05-13T15:17:12.611Z","related":["ALSA-2026:27929","ALSA-2026:28000","ALSA-2026:28157","ALSA-2026:28158","ALSA-2026:28159","ALSA-2026:32992","CGA-jc89-hf9m-4f4f","openSUSE-SU-2026:10798-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44432.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-409"]},"references":[{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44432.json"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:15862"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:20338"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:22934"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:24000"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:24009"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:24014"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:24069"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:24374"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:24476"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:24483"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:24540"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:24541"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:24542"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:24544"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:25039"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:25143"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:25928"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:26212"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:26304"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:27929"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:28000"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:28157"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:28158"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:28159"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:28571"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:30076"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:30078"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:30087"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:30088"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:30089"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:32992"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:33313"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:33683"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:34160"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:34374"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:34526"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:34531"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:34533"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:34607"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:36350"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:37275"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:41066"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:42078"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:42079"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:42132"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:42144"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:42644"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:42796"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:43038"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:7625"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:7634"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-44432"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44432.json"},{"type":"ADVISORY","url":"https://github.com/urllib3/urllib3/security/advisories/GHSA-mf9v-mfxr-j63j"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-44432"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2477154"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/urllib3/urllib3","events":[{"introduced":"720f484b605f18887a48eef448d0084e2b76902d"},{"fixed":"9a950b92d999f906b6020bb2d1076ee56cddd5d2"}],"database_specific":{"extracted_events":[{"introduced":"2.6.0"},{"fixed":"2.7.0"}],"source":["AFFECTED_FIELD","CPE_RANGE"],"cpe":"cpe:2.3:a:python:urllib3:*:*:*:*:*:*:*:*"}}],"versions":["2.6.3","2.6.2","2.6.1","2.6.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-44432.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"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"}]}