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CVE-2025-66566VulnerabilityPublished Updated

Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 8.1.4 XP 6.0.2.GA release

Affects Red HatSource GCVE Database

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Authoritative record:CVE-2025-66566· High 8.2

Not known to be exploited · CVSS 8.2 High : upgrade Red Hat lz4-java to 1.10.1 soon.

Data as of 5 Nov 2026, 20:35 UTC

CVSS 4.0 base score
8.2High
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 1.10.1
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 5 Dec 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.

What to do

Upgrade com.github.yawkat/lz4-java to 1.10.1.

Affected software

ProductAffectedFixed in
Mavencom.github.yawkat/lz4-javapkg:maven/com.github.yawkat/lz4-javaOther threatsAffected
  • <1.10.1
Fixed in
  • 1.10.1

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A cumulative patch release for Red Hat JBoss Enterprise Application Platform 8.1.4 XP 6.0.2.GA has been issued that addresses this vulnerability. Users should apply this update after ensuring all previous relevant errata are applied and backing up their installations. No additional mitigations are specified by Red Hat beyond applying the official patch.

Description

CVE-2025-66566 is an information disclosure vulnerability in the lz4-java library used by Red Hat JBoss Enterprise Application Platform 8.1.4 XP 6.0.2.GA. The flaw arises from insufficient clearing of the output buffer in Java-based decompressor implementations, which can lead to exposure of sensitive data when processing crafted compressed input. JNI-based implementations of lz4-java are not affected. Red Hat has released a cumulative patch including this fix.

References

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