Is CVE-2026-42585 in the CISA KEV catalog?

No. CVE-2026-42585 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-42585?

CVE-2026-42585 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2026-42585?

CVE-2026-42585 has an EPSS score of 0.25% (16th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-42585?

Upgrade libnetty-java on ubuntu 14.04 to 1:3.2.6.Final-2+deb8u2ubuntu0.1~esm1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2026-42585

MEDIUM

6.5

CVSS v3

NVD

Description

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty incorrectly parses malformed Transfer-Encoding, enabling request smuggling attacks. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

CWE-444

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 VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

0.25%probability of exploitation in 30 days

16thpercentile

Low risk: more likely to be exploited than 16% of all known CVEs.

References

Exploit1

github.com

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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.