CVE-2026-97688— urllib3: Chunked Deflate streaming can enter an infinite loop
一分钟漏洞结论
影响对象
urllib3 urllib3
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
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 repeatedl
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一、 漏洞 CVE-2026-97688 基础信息
漏洞信息
尽管我们使用了先进的大模型技术，但其输出仍可能包含不准确或过时的信息。神龙努力确保数据的准确性，但请您根据实际情况进行核实和判断。
Vulnerability Title
urllib3: Chunked Deflate streaming can enter an infinite loop
来源: CVE Program / CVE List V5
Vulnerability 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.
来源: CVE Program / CVE List V5
CVSS Information
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
来源: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
来源: CVE Program / CVE List V5
受影响产品
二、漏洞 CVE-2026-97688 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
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CVE-2026-97688 其他参考 (3)
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https://github.com/urllib3/urllib3/releases/tag/2.8.0 x_refsource_MISC
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https://github.com/urllib3/urllib3/security/advisories/GHSA-gh4c-6fx4-qh6g x_refsource_CONFIRM
同批安全公告 · urllib3 · 2026-09-29 · 共 3 条
| CVE-2026-97689 | 8.9 HIGH | urllib3: HTTPResponse.stream()/read_chunked() buffers an unbounded chunk-size line into me |
| CVE-2026-97687 | 7.6 HIGH | urllib3: HTTPS proxy TLS configuration may be ignored or overridden |
IV. Related Vulnerabilities
V. Comments for CVE-2026-97688
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