{"id":"RHLW-2026-2cb9a31c02a7f38b","summary":"Lightwell Security Advisory: mina-filter-compression 2.2.5.rhlw-00008","details":"Red Hat Lightwell has released org.apache.mina:mina-filter-compression 2.2.5.rhlw-00008 with a backported security fix.\n\nCVE-2026-47321: The CompressionFilter class uses ZLib to deflate and inflate data sent and received. When we inflate incoming data, the filter does not control the resulting size, and create a buffer no matter what.\n\nSome compressed data may have a compression ration greater than 1 thousand, leading to an exhaustion of the application memory, as we don't control the deflated size.\n\n\n\n\nThe fix adds such a control by allowing the application developer to provide a fixed size limit, which when reached throws an exception. It also allows the user to provide a compression ratio that should not be exceeded, protected the application from small inflated files that inflate in gigantic files, but with a grace limit for the resulting size (1Mb) to avoid false positive (like a very small file inflating with a high ratio, but resulting with a acceptable size, like a few thousands bytes)\n\n\n\n\nFor application using this feature, it is highly recommended to create the CompressionFilter and to pass the maximum limit as a forth constructor parameter, maxDecompressedSize:\n\n\n\n\npublic CompressionFilter(final boolean compressInbound, final boolean compressOutbound, final int compressionLevel, final int maxDecompressedSize)Optionally one can also provide a maxDecompressRatio fifth parameter, and a decompressRatioMinSize sixth parameter to allow small inflated files with a high compression ratio to still be accepted.\n\n\n\n\nHere are the additional constructor:\n\n\n\n\n\n\npublic CompressionFilter(final boolean compressInbound, final boolean compressOutbound,\n\n\n\n            final int compressionLevel, final int maxDecompressedSize,\n\n\n\n            final long maxDecompressRatio, final long decompressRatioMinSize)\n\n\n\n\n\n\n\n\nAlso note that a fluent API has been added to spare the users the pain to call a constructor with that many parameters:\n\n\n\n\n\n\n CompressionFilter compressionFilter = new CompressionFilter()\n\n                                                .setCompressionLevel(Zlib.COMPRESSION_MAX)\n\n                                                .setMaxDecompressedSize(1_000_000)\n\n                                                .setMaxDecompressRatio(100).\n\n                                                .setDecompressRatioMinSize(100_000); \n\n\n\n\n\n\n\n\n\nApplications using Apache MINA are advised to upgrade and configure their CompressionFilter instance.\n\nThis patched artifact is a drop-in replacement for org.apache.mina:mina-filter-compression 2.2.5 from Maven Central.","modified":"2026-10-27T08:45:03.092411130Z","published":"2026-10-22T14:30:12Z","upstream":["CVE-2026-47321"],"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-47321"}],"affected":[{"package":{"name":"org.apache.mina:mina-filter-compression","ecosystem":"Red Hat Lightwell:Maven","purl":"pkg:maven/org.apache.mina/mina-filter-compression"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.2.5.rhlw-00008"}]}],"versions":["1.0.0","1.0.1","1.0.10","1.0.2","1.0.3","1.0.4","1.0.5","1.0.6","1.0.7","1.0.8","1.0.9","1.1.0","1.1.1","1.1.2","1.1.3","1.1.4","1.1.5","1.1.6","1.1.7","2.0.0","2.0.0-M1","2.0.0-M2","2.0.0-M3","2.0.0-M4","2.0.0-M5","2.0.0-M6","2.0.0-RC1","2.0.1","2.0.10","2.0.11","2.0.12","2.0.13","2.0.14","2.0.15","2.0.16","2.0.17","2.0.18","2.0.19","2.0.2","2.0.20","2.0.21","2.0.22","2.0.23","2.0.24","2.0.25","2.0.26","2.0.27","2.0.28","2.0.29","2.0.3","2.0.30","2.0.31","2.0.4","2.0.5","2.0.6","2.0.7","2.0.8","2.0.9","2.1.0","2.1.1","2.1.10","2.1.11","2.1.12","2.1.13","2.1.14","2.1.15","2.1.2","2.1.3","2.1.4","2.1.5","2.1.6","2.1.7","2.1.8","2.1.9","2.2.0","2.2.1","2.2.2","2.2.3","2.2.4","2.2.5"],"database_specific":{"lightwell":{"remediated_version":"2.2.5.rhlw-00008","repository_url":"https://packages.redhat.com/lightwell/java/remediated/","backport_base_version":"2.2.5"},"source":"https://github.com/project-lightwell/lightwell-osv/blob/main/advisories/RHLW-2026-2cb9a31c02a7f38b.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}],"credits":[{"name":"Red Hat Lightwell","type":"REMEDIATION_DEVELOPER"}]}