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Vulnerability record · CVE-2026-3945 · published 30 March 2026

CVE-2026-3945: Integer overflow vulnerability

An integer overflow vulnerability in the HTTP chunked transfer encoding parser in tinyproxy up to and including version 1.11.3 allows an unauthenticated remote attacker to cause a denial of service (DoS). The issue occurs because chunk size values are parsed using strtol without properly validating overflow conditions (e.g., errno == ERANGE).

8.7 CVSS 4.0 High EPSS 1.0% · top 37.6% CWE-190 · Integer overflow Awaiting Analysis
8.7CVSS 4.0 base score, v2 7.8
1.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
10 Aug 2026Last modified by NVD

Description

An integer overflow vulnerability in the HTTP chunked transfer encoding parser in tinyproxy up to and including version 1.11.3 allows an unauthenticated remote attacker to cause a denial of service (DoS). The issue occurs because chunk size values are parsed using strtol without properly validating overflow conditions (e.g., errno == ERANGE).

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:

References

LinkTags
https://github.com/tinyproxy/tinyproxy/commit/969852c
https://github.com/tinyproxy/tinyproxy/commit/bb7edc4
https://github.com/tinyproxy/tinyproxy/issues/602
https://github.com/tinyproxy/tinyproxy/pull/603
https://github.com/tinyproxy/tinyproxy/releases

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-3945), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.