Vulnerability in Tinyproxy Project
CVE-2026-31842
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.
Vulnerability class: HTTP Request Smuggling
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.007 (52.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 52.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.007 · change: +0.002
Affected products
- Tinyproxy Project — versions 0
- Tinyproxy Project
Weakness classification (CWE)
References
- 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c (issue-tracking, Exploit, technical-description, Issue Tracking, third-party-advisory)
- 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c (Product, product)
- 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c (Technical Description, Exploit, technical-description)
Frequently asked questions
- What is CVE-2026-31842?
- CVE-2026-31842 is a high-severity vulnerability in Tinyproxy Project, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 7.5/10. Published 2026-04-07.
- How severe is CVE-2026-31842?
- High severity. CVSS v3 base score is 7.5 out of 10.