CVE-2026-5720 | miniupnp project miniupnpd up to 2.3.9 HTTP Request ParseHttpHeaders integer underflow

VDB-358136 · CVE-2026-5720 · GCVE-0-2026-5720 MINIUPNP PROJECT MINIUPNPD UP TO 2.3.9 HTTP REQUEST PARSEHTTPHEADERS INTEGER UNDERFLOW HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 6.0 $0-$5k 2.09+ Summaryinfo A vulnerability, which was classified as critical, was found in miniupnp project miniupnpd up to 2.3.9. This impacts the function ParseHttpHeaders of the component HTTP Request Handler. Such manipulation leads to integer underflow. This vulnerability is documented as CVE-2026-5720. The attack requires being on the local network. There is not any exploit available. You should upgrade the affected component. Detailsinfo A vulnerability was found in miniupnp project miniupnpd up to 2.3.9. It has been rated as critical. Affected by this issue is the function ParseHttpHeaders of the component HTTP Request Handler. The manipulation with an unknown input leads to a integer underflow vulnerability. Using CWE to declare the problem leads to CWE-191. The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result. Impacted is confidentiality, integrity, and availability. CVE summarizes: 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. The weakness was released by Kazuma Matsumoto. The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-5720 since 04/06/2026. The exploitation is known to be easy. The attack can only be initiated within the local network. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. Upgrading to version 2.3.10 eliminates this vulnerability. Productinfo Type Project Management Software Vendor miniupnp project Name miniupnpd Version 2.3.0 2.3.1 2.3.2 2.3.3 2.3.4 2.3.5 2.3.6 2.3.7 2.3.8 2.3.9 CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA CVSS-B Score: 🔒 CNA CVSS-BT Score: 🔒 CNA Vector: 🔒 CVSSv3info VulDB Meta Base Score: 6.3 VulDB Meta Temp Score: 6.0 VulDB Base Score: 6.3 VulDB Temp Score: 6.0 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Integer underflow CWE: CWE-191 / CWE-189 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Partially Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: miniupnpd 2.3.10 Timelineinfo 04/06/2026 CVE reserved 04/17/2026 +11 days Advisory disclosed 04/17/2026 +0 days VulDB entry created 04/17/2026 +0 days VulDB entry last update Sourcesinfo Advisory: github.com Researcher: Kazuma Matsumoto Status: Confirmed CVE: CVE-2026-5720 (🔒) GCVE (CVE): GCVE-0-2026-5720 GCVE (VulDB): GCVE-100-358136 Entryinfo Created: 04/17/2026 23:54 Changes: 04/17/2026 23:54 (69) Complete: 🔍 Cache ID: 99:2BF:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸