CVE-2026-31842

Published: Apr 7, 2026Modified: Aug 10, 2026

8.7

Vector

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:X/V:X/RE:X/U:X

Show more

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:X/V:X/RE:X/U:XShow less

Source: 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c (Secondary)

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.

Affected (1)

Products: Tinyproxy Project: Tinyproxy

Tinyproxy Project

1 product

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Tinyproxy Project Tinyproxy	Up to 1.11.3

Related CWEs

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.

References (3)

https://datatracker.ietf.org/doc/html/rfc7230

Source: 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c

ExploitTechnical Description

https://github.com/tinyproxy/tinyproxy

Source: 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c

Product

https://github.com/tinyproxy/tinyproxy/issues/604

Source: 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c

ExploitIssue Tracking

Timeline

No history available yet.