CVE & CISA-KEV Catalog

CVE-2026-42586

MEDIUM
6.8
CVSS v3
NVD

Description

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, the Netty Redis codec encoder (RedisEncoder) writes user-controlled string content directly to the network output buffer without validating or sanitizing CRLF (\r\n) characters. Since the Redis Serialization Protocol (RESP) uses CRLF as the command/response delimiter, an attacker who can control the content of a Redis message can inject arbitrary Redis commands or forge fake responses. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

CWE-93

How to fix

Remediation Available
libnetty-javaUbuntu
Fixed in:1:3.2.6.Final-2+deb8u2ubuntu0.1~esm1USN-8401-1
Fixed in:1:4.0.34-1ubuntu0.1~esm4USN-8401-1
Fixed in:1:4.1.7-4ubuntu0.1+esm6USN-8401-1
Fixed in:1:4.1.45-1ubuntu0.1~esm6USN-8401-1
Fixed in:1:4.1.48-4+deb11u2ubuntu0.1+esm3USN-8401-1
Fixed in:1:4.1.48-9ubuntu0.1+esm3USN-8401-1
nettyUbuntu
Fixed in:1:3.2.6.Final-2+deb8u2ubuntu0.1~esm1USN-8401-1
Fixed in:1:4.0.34-1ubuntu0.1~esm4USN-8401-1
Fixed in:1:4.1.7-4ubuntu0.1+esm6USN-8401-1
Fixed in:1:4.1.45-1ubuntu0.1~esm6USN-8401-1
Fixed in:1:4.1.48-4+deb11u2ubuntu0.1+esm3USN-8401-1
Fixed in:1:4.1.48-9ubuntu0.1+esm3USN-8401-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityLow
IntegrityHigh
AvailabilityNone

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

Exploit Intelligence

0.20%probability of exploitation in 30 days
10thpercentile

Low risk: more likely to be exploited than 10% of all known CVEs.

References

Exploit1
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Markdown

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HTML

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-18.