{"cve":"CVE-2026-44432","nvd":{"published":"2026-05-13T16:16:57.303","modified":"2026-09-10T13:20:11.887","status":"Modified","description":"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.","cvss_v4":{"vector":"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","score":8.9},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-409"],"references":["https://github.com/urllib3/urllib3/security/advisories/GHSA-mf9v-mfxr-j63j","https://access.redhat.com/errata/RHSA-2026:15862","https://access.redhat.com/errata/RHSA-2026:20338","https://access.redhat.com/errata/RHSA-2026:22934","https://access.redhat.com/errata/RHSA-2026:24000"],"products":["python:urllib3"],"source":"nvd","synced_at":"2026-10-19T22:35:16.954578616+00:00"},"epss":{"cve":"CVE-2026-44432","score":0.0068,"percentile":0.52397,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-mf9v-mfxr-j63j","url":"https://osv.dev/vulnerability/GHSA-mf9v-mfxr-j63j","summary":"urllib3: Decompression-bomb safeguards bypassed in parts of the streaming API","modified":"2026-09-10T03:51:06.409994465Z","packages":[{"ecosystem":"PyPI","name":"urllib3","purl":"pkg:pypi/urllib3","ranges":[">=2.6.0 <2.7.0"],"fixed":["2.7.0"]}]},{"id":"PYSEC-2026-142","url":"https://osv.dev/vulnerability/PYSEC-2026-142","summary":"","modified":"2026-05-20T09:19:21.038869Z","packages":[{"ecosystem":"PyPI","name":"urllib3","purl":"pkg:pypi/urllib3","ranges":[">=2.6.0 <2.7.0"],"fixed":["2.7.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}