Vulnerability record · CVE-2026-31842 · published 7 April 2026

CVE-2026-31842: Tinyproxy project tinyproxy http request smuggling vulnerability

TTinyproxy Project · Tinyproxy

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.

8.7 CVSS 4.0 High EPSS 0.74% · top 47.1% CWE-444 · HTTP request smuggling

8.7CVSS 4.0 base score, v2 7.8

0.74%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

3References, 2 tagged exploit

10 Aug 2026Last modified by NVD

Description

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

TTinyproxy Tinyproxy Project

References

Link	Tags
https://datatracker.ietf.org/doc/html/rfc7230	ExploitTechnical Description
https://github.com/tinyproxy/tinyproxy	Product
https://github.com/tinyproxy/tinyproxy/issues/604	ExploitIssue Tracking

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-31842), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.