CVE-2025-66566

high

Published 2026-01-19 · Modified 2026-03-06

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CVSS v3

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CVSS v4 NEW

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not yet in upstream

VIR risk

8.0

Description

yawkat LZ4 Java has a possible information leak in Java safe decompressor

Predictions

Exploit likelihood

20%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

OS impact

Debian Affected 5 releases

Version	Status	Fixed in
trixie	Affected	—
sid	Affected	—
forky	Affected	—
bullseye	Affected	—
bookworm	Affected	—

Red Hat Fixed 1 release

Version	Status	Fixed in
9	Fixed	—

Rocky Linux Fixed 1 release

Version	Status	Fixed in
9	Fixed	—

Package impact

Ecosystem	Package	Vulnerable	Fixed
Maven	at.yawk.lz4:lz4-java	`<1.10.1`	`1.10.1`
Maven	org.lz4:lz4-java	`<=1.8.1`
Maven	org.lz4:lz4-pure-java	`<=1.8.1`
Maven	net.jpountz.lz4:lz4	`<=1.8.1`

References

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.