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CVE-2026-31842— Tinyproxy HTTP request parsing desynchronization via case-sensitive Transfer-Encoding handling

Quick assessment

Affected
Tinyproxy Project Tinyproxy
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Tinyproxy是Tinyproxy开源的一个小型、高效的 HTTP/SSL 代理守护程序。 Tinyproxy 1.11.3及之前版本存在安全漏洞，该漏洞源于HTTP请求解析不同步，可能导致拒绝服务或绕过安全检查。

CVSS 7.5 · High EPSS 0.74% · P54

Affected Version Matrix 1

VendorProduct Version RangeStatus
Tinyproxy Project Tinyproxy ≤ 1.11.3 affected
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I. Basic Information for CVE-2026-31842

Vulnerability Information
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Vulnerability Title
Tinyproxy HTTP request parsing desynchronization via case-sensitive Transfer-Encoding handling
Source: CVE Program / CVE List V5
Vulnerability Description
Tinyproxy through 1.11.3 is vulnerable to HTTP request parsing desynchronization due to a case-sensitive comparison of the Transfer-Encoding header in src/reqs.c. The is_chunked_transfer function uses strcmp to compare the header value against "chunked", even though RFC 7230 specifies that transfer-coding names are case-insensitive.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Source: CVE Program / CVE List V5
Vulnerability Title
Tinyproxy 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Tinyproxy是Tinyproxy开源的一个小型、高效的 HTTP/SSL 代理守护程序。 Tinyproxy 1.11.3及之前版本存在安全漏洞，该漏洞源于HTTP请求解析不同步，可能导致拒绝服务或绕过安全检查。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Tinyproxy Project Tinyproxy 0 ~ 1.11.3 -

II. Public POCs for CVE-2026-31842

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 9075 chars
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III. Intelligence Information for CVE-2026-31842

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Vendor Advisories for CVE-2026-31842 (1)

IV. Related Vulnerabilities

Same product: Tinyproxy
Same weakness: CWE-444

V. Comments for CVE-2026-31842

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