{"id":"CVE-2026-26312","state":"PUBLISHED","title":"Stalwart Mail Server has Out-of-Memory Denial of Service via Malformed Nested MIME Messages","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.","publishedAt":"2026-02-19T21:05:11.788Z","updatedAt":"2026-02-20T19:58:25.519Z","severity":{"score":6.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["stalwartlabs stalwart"],"affected":[{"vendor":"stalwartlabs","product":"stalwart","versions":[{"version":">= 0.13.0, < 0.15.5","status":"affected"}]}],"references":["https://github.com/stalwartlabs/stalwart/security/advisories/GHSA-jm95-876q-c9gw"],"weaknesses":["CWE-770"],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/26xxx/CVE-2026-26312.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-26312","state":"PUBLISHED","datePublished":"2026-02-19T21:05:11.788Z","dateUpdated":"2026-02-20T19:58:25.519Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-02-13T16:27:51.806Z"},"containers":{"cna":{"title":"Stalwart Mail Server has Out-of-Memory Denial of Service via Malformed Nested MIME Messages","descriptions":[{"lang":"en","value":"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":[{"vendor":"stalwartlabs","product":"stalwart","versions":[{"version":">= 0.13.0, < 0.15.5","status":"affected"}]}],"references":[{"url":"https://github.com/stalwartlabs/stalwart/security/advisories/GHSA-jm95-876q-c9gw","name":"https://github.com/stalwartlabs/stalwart/security/advisories/GHSA-jm95-876q-c9gw","tags":["x_refsource_CONFIRM"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-770","lang":"en","description":"CWE-770: Allocation of Resources Without Limits or Throttling","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-02-19T21:05:11.788Z"},"source":{"advisory":"GHSA-jm95-876q-c9gw","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-02-20T19:57:47.994070Z","id":"CVE-2026-26312","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-02-20T19:58:25.519Z"}}]}}}