Vulnerability details
CVE-2026-93563
Red Hat JBoss Enterprise Application Platform 7Red Hat Single Sign-On 7Red Hat build of Apache Camel for Spring Boot 4
Io.netty/netty-codec-smtp: netty: unbounded multi-line response accumulation in smtpresponsedecoder leads to memory-exhaustion dos
CVSS 3.1
7.5High
Official description
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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 7.5High | 3.1 | CVEProject cvelistV5 (CNA) (redhat) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Red Hat | Red Hat JBoss Enterprise Application Platform 7 | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat JBoss Enterprise Application Platform 7 | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat JBoss Enterprise Application Platform 7 | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat JBoss Enterprise Application Platform 7 | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat Single Sign-On 7 | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat build of Apache Camel for Spring Boot 4 | All | CVEProject cvelistV5 (CNA) |
References and advisories
2- https://access.redhat.com/security/cve/CVE-2026-93563 vdb-entryx_refsource_REDHAT
- https://bugzilla.redhat.com/show_bug.cgi?id=2536976 issue-trackingx_refsource_REDHAT
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Details
- Published
- 2026-09-18
- Last updated
- 2026-09-25
- State
- Published
- Assigner (CNA)
- redhat
Exploit prediction (EPSS)
0.32%
Probability of exploitation in 30 days
25.7%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-1035