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CVE-2026-93563

CVE-2026-93563 · Io.netty/netty-codec-smtp: netty: unbounded multi-line response accumulation in smtpresponsedecoder leads to memory-exhaustion dos

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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 7.5 · High · EPSS 0.3%

Published
Updated

Stack: system

Affected products and versions

  • red hat build of apache camel for spring boot 4

    No fix published

  • red hat fuse 7

    No fix published

  • red hat jboss enterprise application platform 7

    No fix published

  • red hat single sign-on 7

    No fix published

  • netty Debian:12

    Versions
    • 1:4.1.48-10
    • 1:4.1.48-11
    • 1:4.1.48-12
    • 1:4.1.48-13
    • 1:4.1.48-14
    • 1:4.1.48-15
    • 1:4.1.48-16
    • 1:4.1.48-7
    • 1:4.1.48-7+deb12u1
    • 1:4.1.48-7+deb12u2
    • 1:4.1.48-8
    • 1:4.1.48-9
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • netty Debian:13

    Versions
    • 1:4.1.48-10
    • 1:4.1.48-10+deb13u1
    • 1:4.1.48-11
    • 1:4.1.48-12
    • 1:4.1.48-13
    • 1:4.1.48-14
    • 1:4.1.48-15
    • 1:4.1.48-16
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • netty Debian:14

    Versions
    • 1:4.1.48-10
    • 1:4.1.48-11
    • 1:4.1.48-12
    • 1:4.1.48-13
    • 1:4.1.48-14
    • 1:4.1.48-15
    • 1:4.1.48-16
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • netty Ubuntu:Pro:14.04:LTS

    Versions
    • 1:3.2.6.Final-2
    • 1:3.2.6.Final-2+deb8u2build0.14.04.1~esm1
    • 1:3.2.6.Final-2+deb8u2ubuntu0.1~esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • netty Ubuntu:Pro:16.04:LTS

    Versions
    • 1:3.2.6.Final-2
    • 1:4.0.32-1
    • 1:4.0.33-1
    • 1:4.0.34-1
    • 1:4.0.34-1ubuntu0.1~esm1
    • 1:4.0.34-1ubuntu0.1~esm2
    • 1:4.0.34-1ubuntu0.1~esm3
    • 1:4.0.34-1ubuntu0.1~esm4
    • 1:4.0.34-1ubuntu0.1~esm5
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • netty Ubuntu:Pro:18.04:LTS

    Versions
    • 1:4.1.7-4
    • 1:4.1.7-4ubuntu0.1~esm1
    • 1:4.1.7-4ubuntu0.1
    • 1:4.1.7-4ubuntu0.1+esm1
    • 1:4.1.7-4ubuntu0.1+esm2
    • 1:4.1.7-4ubuntu0.1+esm3
    • 1:4.1.7-4ubuntu0.1+esm4
    • 1:4.1.7-4ubuntu0.1+esm5
    • 1:4.1.7-4ubuntu0.1+esm6
    • 1:4.1.7-4ubuntu0.1+esm7
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • netty Ubuntu:Pro:20.04:LTS

    Versions
    • 1:4.1.33-1
    • 1:4.1.33-2
    • 1:4.1.33-3
    • 1:4.1.45-1
    • 1:4.1.45-1ubuntu0.1~esm1
    • 1:4.1.45-1ubuntu0.1~esm2
    • 1:4.1.45-1ubuntu0.1~esm3
    • 1:4.1.45-1ubuntu0.1~esm4
    • 1:4.1.45-1ubuntu0.1~esm6
    • 1:4.1.45-1ubuntu0.1~esm7
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • netty Ubuntu:Pro:22.04:LTS

    Versions
    • 1:4.1.48-4
    • 1:4.1.48-4+deb11u1build0.22.04.1
    • 1:4.1.48-4+deb11u2build0.22.04.1
    • 1:4.1.48-4+deb11u2ubuntu0.1~esm1
    • 1:4.1.48-4+deb11u2ubuntu0.1~esm2
    • 1:4.1.48-4+deb11u2ubuntu0.1
    • 1:4.1.48-4+deb11u2ubuntu0.1+esm1
    • 1:4.1.48-4+deb11u2ubuntu0.1+esm3
    • 1:4.1.48-4+deb11u2ubuntu0.2
    • 1:4.1.48-4+deb11u2ubuntu0.2+esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • netty Ubuntu:Pro:24.04:LTS

    Versions
    • 1:4.1.48-7
    • 1:4.1.48-8
    • 1:4.1.48-9
    • 1:4.1.48-9ubuntu0.1~esm1
    • 1:4.1.48-9ubuntu0.1~esm2
    • 1:4.1.48-9ubuntu0.1
    • 1:4.1.48-9ubuntu0.1+esm1
    • 1:4.1.48-9ubuntu0.1+esm3
    • 1:4.1.48-9ubuntu0.2
    • 1:4.1.48-9ubuntu0.2+esm1
    • 1:4.1.48-9ubuntu0.2+esm2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • netty Ubuntu:26.10

    Versions
    • 1:4.1.48-16
    • 1:4.1.48-16ubuntu1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • netty Ubuntu:Pro:26.04:LTS

    Versions
    • 1:4.1.48-10
    • 1:4.1.48-11
    • 1:4.1.48-12
    • 1:4.1.48-13
    • 1:4.1.48-14
    • 1:4.1.48-16
    • 1:4.1.48-16ubuntu0.1~esm2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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