CVE-2026-31842
Tinyproxy HTTP request parsing desynchronization via case-sensitive Transfer-Encoding handling
HIGH 8.7EPSS 0.7%
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
- Tinyproxy Project · Tinyproxy
- CVSS v4.0 CNA
- 8.7 HIGH
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 - CVSS v3.1 CNA
- 7.5 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - CVSS v2.0 CNA
- 7.8 HIGH
AV:N/AC:L/Au:N/C:N/I:N/A:C - EPSS
- 0.74% chance of exploitation in the next 30 days, 54th percentile
- Published
- 2026-04-07
- Updated
- 2026-08-10
Proof-of-concept exploits (1)
- tinyproxy/tinyproxy/issues/6046023★ · 2026-09-21