{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-9375", "assignerOrgId": "c09c270a-b464-47c1-9133-acb35b22c19a", "state": "PUBLISHED", "assignerShortName": "@huntr_ai", "dateReserved": "2026-05-23T14:33:21.716Z", "datePublished": "2026-06-19T18:45:10.409Z", "dateUpdated": "2026-06-19T18:45:10.409Z"}, "containers": {"cna": {"title": "Decompression Bomb Bypass via Negative max_length in Streaming API in urllib3", "providerMetadata": {"orgId": "c09c270a-b464-47c1-9133-acb35b22c19a", "shortName": "@huntr_ai", "dateUpdated": "2026-06-19T18:45:10.409Z"}, "descriptions": [{"lang": "en", "value": "urllib3 version 2.6.3 is vulnerable to a decompression bomb bypass in its streaming API (`preload_content=False`) when using Brotli support. The issue arises due to three independent code paths in `response.py` that bypass the `max_length` protection introduced in version 2.6.0 to mitigate CVE-2025-66471. Specifically, negative `max_length` values can be produced due to buffer arithmetic in `read()`, `flush_decoder` unconditionally overrides `max_length` to `-1`, and `_flush_decoder()` passes no limit at all, defaulting to unlimited decompression. This allows a malicious HTTP server to trigger an out-of-memory (OOM) condition by decompressing large payloads into memory, leading to a denial of service (DoS). The vulnerability affects urllib3 2.6.3 and Brotli 1.2.0 and impacts applications and libraries using `requests` or `urllib3` to stream content from untrusted sources."}], "affected": [{"vendor": "urllib3", "product": "urllib3/urllib3", "versions": [{"version": "unspecified", "lessThan": "2.7.0", "status": "affected", "versionType": "custom"}]}], "references": [{"url": "https://huntr.com/bounties/ddd09eb9-b87d-4a43-84df-48837b1bbc23"}, {"url": "https://github.com/urllib3/urllib3/commit/2bdcc44d1e163fb5cc48a8662425e35e15adfe6a"}], "metrics": [{"cvssV3_0": {"version": "3.0", "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH"}}], "problemTypes": [{"descriptions": [{"type": "CWE", "lang": "en", "description": "CWE-400 Uncontrolled Resource Consumption", "cweId": "CWE-400"}]}], "source": {"advisory": "ddd09eb9-b87d-4a43-84df-48837b1bbc23", "discovery": "EXTERNAL"}}}}

{}

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{"created": "2026-06-19T20:30:04.652196+00:00", "updated": "2026-06-19T20:30:04.652202+00:00", "vendors": []}