CVE-2026-26312 is a denial-of-service vulnerability affecting Stalwart Mail Server versions 0.13.0 through 0.15.4. A specially crafted email with malformed nested message/rfc822 MIME parts can trigger excessive CPU and memory consumption when accessed via IMAP or JMAP, leading to a server crash. This vulnerability has a CVSS score of 6.5 (Medium), indicating a network-based attack with low complexity that can result in high availability impact. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 0.13.0, < 0.15.5CPE matchmatch criteria | cpe:2.3:a:stalw:stalwart:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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