CVE-2026-106452yawkat LZ4 Java: LZ4BlockInputStream allocates an unvalidated compressed length from the stream header
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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yawkat LZ4 Java provides LZ4 compression for Java. Prior to 1.11.2, net.jpountz.lz4.LZ4BlockInputStream refill() validates that the compressedLen field in a legacy LZ4Block header is nonnegative but allocates a compressed-input buffer of that attacker-controlled size before reading payload data, allowing a header-only stream to request a near-2 GiB allocation and exhaust the JVM heap. Canonical writers emit raw blocks when compression is not smaller than the original block, but vulnerable readers accept non-canonical oversized compressed blocks. This issue is fixed in version 1.11.2.
- CVSS
- 5.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- Weakness (CWE)
- CWE-789
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Awaiting Analysis
- Record last updated
- Oct 7, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
yawkat lz4-java yawkat:lz4_java (from the name) | before 1.11.2 | CNA record |
References
- https://github.com/yawkat/lz4-java/security/advisories/GHSA-4v53-57pg-c464x-refsource-confirm
- https://github.com/yawkat/lz4-java/commit/bb83dd16163cdb71231af06b0a5651881148a634x-refsource-misc
- https://github.com/yawkat/lz4-java/releases/tag/v1.11.2x-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.