{"id":"CVE-2026-104895","aliases":[],"title":"jackson-dataformat-smile: unbounded eager byte[] allocation for raw binary in the async parser allows OutOfMemoryError denial of service","titleSource":"HeroDevs","descriptionSource":"HeroDevs","products":[{"vendor":"FasterXML","name":"jackson-dataformat-smile","platforms":[],"versions":[{"version":"2.9.0","status":"affected","lessThan":"2.18.12","versionType":"maven"},{"version":"2.18.12","status":"unaffected","versionType":"maven"},{"version":"2.19.0","status":"affected","lessThan":"2.21.8","versionType":"maven"},{"version":"2.21.8","status":"unaffected","versionType":"maven"},{"version":"2.22.0","status":"affected","lessThan":"2.22.4","versionType":"maven"},{"version":"2.22.4","status":"unaffected","versionType":"maven"}],"defaultStatus":"unaffected","source":"HeroDevs","url":"https://www.cve.org/CVERecord?id=CVE-2026-104895"},{"vendor":"FasterXML","name":"jackson-dataformat-smile","platforms":[],"versions":[{"version":"3.0.0","status":"affected","lessThan":"3.1.8","versionType":"maven"},{"version":"3.1.8","status":"unaffected","versionType":"maven"},{"version":"3.2.0","status":"affected","lessThan":"3.2.4","versionType":"maven"},{"version":"3.2.4","status":"unaffected","versionType":"maven"}],"defaultStatus":"unaffected","source":"HeroDevs","url":"https://www.cve.org/CVERecord?id=CVE-2026-104895"}],"remediation":[],"description":"The asynchronous Smile parser (NonBlockingByteArrayParser) uses a raw-binary length prefix taken from untrusted input to allocate a byte[] before the body is read, with no upper bound and no overflow check. On the raw-binary marker 0xFD, _decodeVInt() computes (value << 6) + (i & 0x3F) without the (value >>> 25) != 0 overflow guard present in the blocking SmileParser._readUnsignedVInt, and _startRawBinary then allocates the declared length immediately.\n\n\n\nA Smile feed of roughly ten bytes can therefore force an eager allocation of approximately 2 GB, producing an OutOfMemoryError on reactive or asynchronous Smile endpoints. A VInt crafted to overflow int yields a negative length and a NegativeArraySizeException, a RuntimeException that is not a JacksonException and so escapes the parser contract. Either outcome crashes the request or processing thread.\n\n\n\nThis is the same class of issue as CVE-2020-28491 in the CBOR parser of this library, which was fixed with a LONGEST_NON_CHUNKED_BINARY guard; the asynchronous Smile parser never received the equivalent guard. No privileges or user interaction beyond the ability to submit data for parsing are required.","severity":"high","score":7.5,"published":"2026-10-28T00:01:44.496Z","modified":"2026-10-28T00:01:44.496Z","withdrawn":false,"knownExploited":false,"affected":[],"references":["https://github.com/FasterXML/jackson-dataformats-binary/security/advisories/GHSA-h3c2-2m49-r49w"],"sources":[{"name":"CVE","id":"CVE-2026-104895","modified":"2026-10-28T00:01:44.496Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-104895"}],"assessments":[{"source":"HeroDevs","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5}],"sourceAffected":[],"kev":{"status":"not-listed","checkedAt":"2026-10-28T15:45:31.007Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[]}