CVE-2025-66566
high
CVSS v3
—
CVSS v2
—
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
Vendor advisory: alma — https://errata.almalinux.org/9/ALSA-2026-0752.html
Vendor advisory: alma — https://bugzilla.redhat.com/2419500
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2025-66566
Vendor advisory: rocky — https://errata.rockylinux.org/RLSA-2026:0752
Vendor advisory: redhat — https://access.redhat.com/errata/RHSA-2026:20568
Vendor advisory: redhat — https://access.redhat.com/errata/RHSA-2026:0752
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| rhel | 9 | fixed | |
| rocky | 9 | fixed | |
| debian | bookworm | affected | |
| debian | bullseye | affected | |
| debian | forky | affected | |
| debian | sid | affected | |
| debian | trixie | affected | |
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
- https://access.redhat.com/errata/RHSA-2026:0752
- https://access.redhat.com/errata/RHSA-2026:20568
- https://github.com/yawkat/lz4-java/security/advisories/GHSA-cmp6-m4wj-q63q
- https://nvd.nist.gov/vuln/detail/CVE-2025-66566
- https://github.com/yawkat/lz4-java/commit/33d180cb70c4d93c80fb0dc3ab3002f457e93840
- https://github.com/yawkat/lz4-java
- https://errata.rockylinux.org/RLSA-2026:0752
- https://security-tracker.debian.org/tracker/CVE-2025-66566
- https://bugzilla.redhat.com/2419500
- https://errata.almalinux.org/9/ALSA-2026-0752.html
Verify integrity in audit chain (admin only). AS-IS.