CVE-2026-32179 | Microsoft MsQuic up to 2.4.17/2.5.6 integer underflow

VDB-357877 · CVE-2026-32179 · GCVE-0-2026-32179 MICROSOFT MSQUIC UP TO 2.4.17/2.5.6 INTEGER UNDERFLOW HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 7.0 $5k-$25k 2.37+ Summaryinfo A vulnerability identified as critical has been detected in Microsoft MsQuic up to 2.4.17/2.5.6. This vulnerability affects unknown code. This manipulation causes integer underflow. This vulnerability is tracked as CVE-2026-32179. The attack is possible to be carried out remotely. No exploit exists. You should upgrade the affected component. Detailsinfo A vulnerability classified as critical was found in Microsoft MsQuic up to 2.4.17/2.5.6. Affected by this vulnerability is some unknown functionality. The manipulation with an unknown input leads to a integer underflow vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect confidentiality, integrity, and availability. The advisory is shared at github.com. This vulnerability is known as CVE-2026-32179. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 04/16/2026). Upgrading to version 2.4.18 or 2.5.7 eliminates this vulnerability. Productinfo Vendor Microsoft Name MsQuic Version 2.4.0 2.4.1 2.4.2 2.4.3 2.4.4 2.4.5 2.4.6 2.4.7 2.4.8 2.4.9 2.4.10 2.4.11 2.4.12 2.4.13 2.4.14 2.4.15 2.4.16 2.4.17 2.5.0 2.5.1 2.5.2 2.5.3 2.5.4 2.5.5 2.5.6 License commercial Website Vendor: https://www.microsoft.com/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 7.3 VulDB Meta Temp Score: 7.0 VulDB Base Score: 7.3 VulDB Temp Score: 7.0 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: Yes 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: MsQuic 2.4.18/2.5.7 Timelineinfo 04/16/2026 Advisory disclosed 04/16/2026 +0 days VulDB entry created 04/16/2026 +0 days VulDB entry last update Sourcesinfo Vendor: microsoft.com Advisory: github.com Status: Confirmed CVE: CVE-2026-32179 (🔒) GCVE (CVE): GCVE-0-2026-32179 GCVE (VulDB): GCVE-100-357877 Entryinfo Created: 04/16/2026 07:37 Changes: 04/16/2026 07:37 (50) Complete: 🔍 Cache ID: 99:FDA:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸