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Vendor Workaround
See https://github.com/netty/netty/security/advisories/GHSA-pq4x-537v-r54q for fixed versions and remediation guidance.
Tracking
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Sat, 19 Sep 2026 00:15:00 +0000
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threat_severity
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threat_severity
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Fri, 18 Sep 2026 21:30:00 +0000
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| Description | Unbounded multi-line response accumulation in SmtpResponseDecoder leads to memory-exhaustion DoS | A flaw was found in Netty's `SmtpResponseDecoder` component. A remote attacker, acting as a malicious or man-in-the-middle (MITM) SMTP server, could exploit this by sending a specially crafted, unbounded multi-line SMTP response without a terminator. This vulnerability leads to unbounded memory accumulation within the client's Java Virtual Machine (JVM) heap, causing an `OutOfMemoryError` and a denial of service (DoS) due to a process crash. |
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ssvc
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Fri, 18 Sep 2026 13:45:00 +0000
| Type | Values Removed | Values Added |
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| Title | Netty: netty-codec-smtp: io.netty/netty-codec-smtp: netty: unbounded multi-line response accumulation in smtpresponsedecoder leads to memory-exhaustion dos | Io.netty/netty-codec-smtp: netty: unbounded multi-line response accumulation in smtpresponsedecoder leads to memory-exhaustion dos |
Fri, 18 Sep 2026 13:30:00 +0000
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cvssV3_1
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Fri, 18 Sep 2026 11:00:00 +0000
| Type | Values Removed | Values Added |
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| Description | Unbounded multi-line response accumulation in SmtpResponseDecoder leads to memory-exhaustion DoS | |
| Title | Netty: netty-codec-smtp: io.netty/netty-codec-smtp: netty: unbounded multi-line response accumulation in smtpresponsedecoder leads to memory-exhaustion dos | |
| First Time appeared |
Redhat
Redhat camel Spring Boot Redhat jboss Enterprise Application Platform Redhat jboss Fuse Redhat red Hat Single Sign On |
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| Weaknesses | CWE-1035 | |
| CPEs | cpe:/a:redhat:camel_spring_boot:4 cpe:/a:redhat:jboss_enterprise_application_platform:7 cpe:/a:redhat:jboss_fuse:7 cpe:/a:redhat:red_hat_single_sign_on:7 |
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| Vendors & Products |
Redhat
Redhat camel Spring Boot Redhat jboss Enterprise Application Platform Redhat jboss Fuse Redhat red Hat Single Sign On |
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| References |
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Status: PUBLISHED
Assigner: redhat
Published:
Updated: 2026-09-18T20:11:58.092Z
Reserved: 2026-09-18T09:56:54.043Z
Link: CVE-2026-93563
Updated: 2026-09-18T19:07:49.243Z
Status : Awaiting Analysis
Published: 2026-09-18T11:17:21.773
Modified: 2026-09-18T21:18:47.130
Link: CVE-2026-93563
OpenCVE Enrichment
Updated: 2026-09-19T00:30:16Z