CVE-2026-5720: miniupnpd Integer Underflow SOAPAction Header Parsing
miniupnpd contains an integer underflow vulnerability in SOAPAction header parsing that allows remote attackers to cause a denial of service or information disclosure by sending a malformed SOAPAction header with a single quote. Attackers can trigger an out-of-bounds memory read by exploiting improper length validation in ParseHttpHeaders(), where the parsed length underflows to a large unsigned value when passed to memchr(), causing the process to scan memory far beyond the allocated HTTP request buffer.
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2026-5720?
CVE-2026-5720 has been classified as a high severity vulnerability due to its potential to cause denial of service and information disclosure.
How do I fix CVE-2026-5720?
To mitigate CVE-2026-5720, updating to the latest version of miniupnpd that addresses the integer underflow vulnerability is recommended.
What types of attacks can exploit CVE-2026-5720?
CVE-2026-5720 can be exploited by remote attackers through malformed SOAPAction headers, leading to denial of service or revealing sensitive information.
Which software is affected by CVE-2026-5720?
CVE-2026-5720 affects the MiniUPnP miniupnpd software.
What is the nature of the vulnerability in CVE-2026-5720?
CVE-2026-5720 involves an integer underflow in SOAPAction header parsing, enabling remote code execution and denial of service.