Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Stalw | Stalwart | >= 0.13.0, < 0.15.5 |
Related Weaknesses (CWE)
References
- https://github.com/stalwartlabs/stalwart/security/advisories/GHSA-jm95-876q-c9gwVendor AdvisoryExploit
FAQ
What is CVE-2026-26312?
CVE-2026-26312 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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 malfor...
How severe is CVE-2026-26312?
CVE-2026-26312 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-26312?
Check the references section above for vendor advisories and patch information. Affected products include: Stalw Stalwart.