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CVE-2026-109399

SWUpdate through 2026.05.1 CMS Signature Verification Bypass via Embedded Intermediates

SWUpdate through 2026.05.1 contains an improper certificate validation vulnerability in crypto/swupdate_cms_verify_openssl.c that trusts untrusted X.509 certificates embedded in CMS SignedData for chain building. Attackers holding a signing key from a sibling intermediate under the same root can embed that intermediate in the signature to install malicious updates.

CVSS 4.0 · 9.2 Critical EPSS < 1% KEV · Not listed
Vendors
Swupdate
Products
Swupdate
CVE-2026-28525

SWUpdate Integer Underflow in Multipart Upload Parser

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 4.0 · 8.2 High EPSS < 1% KEV · Not listed
Vendors
Sbabic Swupdate
Products
Swupdate Swupdate