CVE-2026-26312
Last modified
CVE-2026-26312 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 0.35% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Stalw | Stalwart | >= 0.13.0, < 0.15.5 |
References
- https://github.com/stalwartlabs/stalwart/security/advisories/GHSA-jm95-876q-c9gwExploit, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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