CVE-2026-28525SWUpdate Integer Underflow in Multipart Upload Parser
Updated under an hour ago ()
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It affects sbabic swupdate and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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 past the allocated receive buffer to a local IPC socket.
- CVSS
- 6.8 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H
- Weakness (CWE)
- CWE-191, CWE-125
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Analyzed
- Record last updated
- Jul 27, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
sbabic swupdate sbabic:swupdate (from the name) | through 2025.12; beee2dc0feef1cfe84f1aa6fc980e104b2e47a74 not affected | CNA record |
swupdate swupdate swupdate:swupdate | through 2025.12 | NVD |
References
- https://github.com/sbabic/swupdate/commit/beee2dc0feef1cfe84f1aa6fc980e104b2e47a74patch
- https://www.vulncheck.com/advisories/swupdate-integer-underflow-in-multipart-upload-parserthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.