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    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.

    Published:Apr 7, 2026
    Last Modified:Aug 10, 2026
    EPS:Apr 7, 2026
    EPSS Score:0.00899
    CVSS Score:7.5

    Affected Products

    Vendor
    Tinyproxy Project
    Product
    Tinyproxy

    Exploits

    https://datatracker.ietf.org/doc/html/rfc7230https://github.com/tinyproxy/tinyproxy/issues/604

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-273 HTTP Response Smuggling
    CAPEC-33 HTTP Request Smuggling

    Related CVEs

    CVE-2026-54388 (CVSS 9.3) — Tinyproxy through 1.11.3, fixed in commit 364cdb6, fails to reject requests containing multiple Content-Length…
    CVE-2026-54387 (CVSS 9.3) — Tinyproxy through 1.11.3, fixed in commit ff45d3b, fails to reconcile conflicting Content-Length and Transfer-…
    CVE-2026-55202 (CVSS 8.8) — Tinyproxy through 1.11.3, fixed in commit 09312a1, fails to properly validate the Host header during stathost …
    CVE-2025-63938 (CVSS 6.5) — Tinyproxy through 1.11.2 contains an integer overflow vulnerability in the strip_return_port() function within…
    CVE-2023-49606 (CVSS 9.8) — A use-after-free vulnerability exists in the HTTP Connection Headers parsing in Tinyproxy 1.11.1 and Tinyproxy…
    CVE-2022-40468 (CVSS 7.5) — Potential leak of left-over heap data if custom error page templates containing special non-standard variables…
    CVE-2017-11747 (CVSS 5.5) — main.c in Tinyproxy 1.8.4 and earlier creates a /run/tinyproxy/tinyproxy.pid file after dropping privileges to…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High