What’s Vulnerable › Vulnerabilities

CVE-2026-3945: tinyproxy Integer Overflow in HTTP Chunked Transfer-Encoding Parser Leading to Denial of Service

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-30 · updated 2026-08-10
• Weakness: CWE-190

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).

Affected products

• tinyproxy: through 1.11.3

References

• 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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