{"schema_version": "1.6.1", "id": "CVE-2022-26477", "summary": "Denial of service in readExternal method", "details": "The Security Team noticed that the termination condition of the for loop in the readExternal method is a controllable variable, which, if tampered with, may lead to CPU exhaustion. As a fix, we added an upper bound and termination condition in the read and write logic. We classify it as a \"low-priority but useful improvement\". SystemDS is a distributed system and needs to serialize/deserialize data but in many code paths (e.g., on Spark broadcast/shuffle or writing to sequence files) the byte stream is anyway protected by additional CRC fingerprints. In this particular case though, the number of decoders is upper-bounded by twice the number of columns, which means an attacker would need to modify two entries in the byte stream in a consistent manner. By adding these checks robustness was strictly improved with almost zero overhead. These code changes are available in versions higher than 2.2.1.", "affected": [{"ranges": [{"type": "SEMVER", "events": [{"introduced": "unspecified"}, {"fixed": "2.2.2"}]}]}], "references": [{"type": "ADVISORY", "url": "https://lists.apache.org/thread/r4x2d2r6d4zykdrrx6s2l4qbxgzws0z3"}]}