swupdate: SWUpdate through 2026.05.1 contains an improper certificate validation vulnerability in crypto/swupdate_cms_verify_op...
CVE-2026-109399 is fixed in swupdate on 1 platform, first by DEBIAN-CVE-2026-109399, released October 13, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| swupdate · Debian 12.15 (bookworm) | 2022.12+dfsg-4+deb12u3 | DEBIAN-CVE-2026-109399 | Oct 13, 2026 |
| swupdate · Debian 14 | 2026.05+dfsg-1 | DEBIAN-CVE-2026-109399 | Oct 13, 2026 |
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