{"id":"CVE-2026-106452","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-106452","generatedAt":"2026-10-28T03:25:59.440Z","title":"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,…","description":"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.","published":"2026-10-06T20:17:27.000Z","lastModified":"2026-10-07T13:58:30.000Z","status":"Awaiting Analysis","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":5.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},"cwe":["CWE-789"],"affected":[],"epss":{"score":0.00454,"percentile":0.39144,"date":"2026-10-26","history":[{"date":"2026-10-07","score":0.00371,"percentile":0.28955}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.45%). Track it; it rarely justifies an emergency change on its own."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-06T20:17:27.000Z","detail":{"score":"5.3","severity":"MEDIUM","publishedAt":"2026-10-06T20:17:27.317Z"},"summary":"New CVE, medium severity (CVSS 5.3)."}],"references":[{"url":"https://github.com/yawkat/lz4-java/commit/bb83dd16163cdb71231af06b0a5651881148a634","source":"security-advisories@github.com"},{"url":"https://github.com/yawkat/lz4-java/releases/tag/v1.11.2","source":"security-advisories@github.com"},{"url":"https://github.com/yawkat/lz4-java/security/advisories/GHSA-4v53-57pg-c464","source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-106452","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}