CVE-2026-28525 | sbabic swupdate up to 2025.12 mongoose_multipart.c mg_http_multipart_continue_wait_for_chunk integer underflow

VDB-359226 · CVE-2026-28525 · GCVE-0-2026-28525 SBABIC SWUPDATE UP TO 2025.12 MONGOOSE_MULTIPART.C MG_HTTP_MULTIPART_CONTINUE_WAIT_FOR_CHUNK INTEGER UNDERFLOW HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 5.2 $0-$5k 4.38+ Summaryinfo A vulnerability classified as problematic was found in sbabic swupdate up to 2025.12. Affected is the function mg_http_multipart_continue_wait_for_chunk of the file mongoose_multipart.c. The manipulation results in integer underflow. This vulnerability is identified as CVE-2026-28525. The attack can be executed remotely. There is not any exploit available. A patch should be applied to remediate this issue. Detailsinfo A vulnerability classified as problematic has been found in sbabic swupdate up to 2025.12. Affected is the function mg_http_multipart_continue_wait_for_chunk of the file mongoose_multipart.c. The manipulation with an unknown input leads to a integer underflow vulnerability. CWE is classifying the issue as 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. This is going to have an impact on availability. CVE summarizes: SWUpdate contains an integer underflow vulnerability in the multipart upload parser in mongoose_multipart.c that allows unauthenticated attackers to cause a denial of service by sending a crafted HTTP POST request to /upload with a malformed multipart boundary and controlled TCP stream timing. Attackers can trigger an integer underflow in the mg_http_multipart_continue_wait_for_chunk() function when the buffer length falls within a specific range, causing an out-of-bounds heap read that writes data beyond the allocated receive buffer to a local IPC socket. The weakness was released by Kazuma Matsumoto as beee2dc0feef1cfe84f1aa6fc980e104b2e47a74. The advisory is available at github.com. This vulnerability is traded as CVE-2026-28525 since 02/27/2026. The exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit. Applying the patch beee2dc0feef1cfe84f1aa6fc980e104b2e47a74 is able to eliminate this problem. The bugfix is ready for download at github.com. Productinfo Vendor sbabic Name swupdate Version 2025.0 2025.1 2025.2 2025.3 2025.4 2025.5 2025.6 2025.7 2025.8 2025.9 2025.10 2025.11 2025.12 License open-source Website Product: https://github.com/sbabic/swupdate/ 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: 5.2 VulDB Meta Temp Score: 5.2 VulDB Base Score: 3.7 VulDB Temp Score: 3.6 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 6.8 CNA Vector (VulnCheck): 🔒 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: Patch Status: 🔍 0-Day Time: 🔒 Patch: beee2dc0feef1cfe84f1aa6fc980e104b2e47a74 Timelineinfo 02/27/2026 CVE reserved 04/23/2026 +54 days Advisory disclosed 04/23/2026 +0 days VulDB entry created 04/23/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: beee2dc0feef1cfe84f1aa6fc980e104b2e47a74 Researcher: Kazuma Matsumoto Status: Confirmed CVE: CVE-2026-28525 (🔒) GCVE (CVE): GCVE-0-2026-28525 GCVE (VulDB): GCVE-100-359226 Entryinfo Created: 04/23/2026 23:34 Changes: 04/23/2026 23:34 (79) Complete: 🔍 Cache ID: 99:91A:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸