CVE-2026-26312
Medium · 6.5CVSS
6.5
EPSS
0.5%
Published
Feb 19, 2026
CISA due date
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The record
Stalwart is a mail and collaboration server. A denial-of-service vulnerability exists in Stalwart Mail Server versions 0.13.0 through 0.15.4 where accessing a specially crafted email containing malformed nested `message/rfc822` MIME parts via IMAP or JMAP causes excessive CPU and memory consumption, potentially leading to an out-of-memory condition and server crash. The malformed structure causes the `mail-parser` crate to produce cyclical references in its parsed representation, which Stalwart then follows indefinitely. Version 0.15.5 contains a patch.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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