PT-2026-28803 · Tinyproxy · Tinyproxy

Muxammadiyev Giyosiddin · Published 2026-01-01 · Updated 2026-04-01 · CVE-2026-3945

Positive Technologies (AI Summary)

CVSS v4.0

8.7

High

Base vector

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

Name of the Vulnerable Software and Affected Versions tinyproxy versions up to and including 1.11.3

Description An integer overflow in the HTTP chunked transfer encoding parser can lead to a denial of service (DoS). The issue arises because chunk size values are parsed without proper overflow validation. A crafted chunk size, such as 0x7fffffffffffffff, bypasses existing checks, causing a signed integer overflow during size calculations. This results in the proxy attempting to read an extremely large amount of request-body data and holding worker connections open indefinitely, potentially exhausting all available worker slots and causing service unavailability.

Recommendations Update to a version of tinyproxy later than 1.11.3.

Fix

Integer Overflow

Weakness Enumeration

CWE-190

Related Identifiers

CVE-2026-3945

OPENSUSE-SU-2026:10471-1

OPENSUSE-SU-2026:20456-1

Affected Products

Tinyproxy

References · 16

• https://github.com/tinyproxy/tinyproxy/commit/969852c · Patch
• https://github.com/tinyproxy/tinyproxy/commit/bb7edc4 · Patch
• https://github.com/tinyproxy/tinyproxy/pull/603 · Patch
• https://osv.dev/vulnerability/openSUSE-SU-2026:20456-1 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:10471-1 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-3945 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-3945 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-3945 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-3945 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-3945 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2026-3945 · Vendor Advisory
• https://github.com/tinyproxy/tinyproxy/issues/602 · Note
• https://github.com/tinyproxy/tinyproxy/releases · Note
• https://twitter.com/CVEnew/status/2038618093342040472 · Twitter Post
• https://suse.com/security/cve/CVE-2026-3945 · Note