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Mon, 22 Jun 2026 16:30:00 +0000
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ssvc
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Sun, 21 Jun 2026 09:45:00 +0000
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Urllib3
Urllib3 urllib3 |
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Urllib3
Urllib3 urllib3 |
Fri, 19 Jun 2026 19:15:00 +0000
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| Description | 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. | |
| Title | Decompression Bomb Bypass via Negative max_length in Streaming API in urllib3 | |
| Weaknesses | CWE-400 | |
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cvssV3_0
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Status: PUBLISHED
Assigner: @huntr_ai
Published:
Updated: 2026-06-22T15:53:30.194Z
Reserved: 2026-05-23T14:33:21.716Z
Link: CVE-2026-9375
Updated: 2026-06-22T15:53:22.610Z
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OpenCVE Enrichment
Updated: 2026-06-20T22:34:39Z