{"id":"CVE-2026-110747","aliases":[],"title":"jackson-dataformat-protobuf: integer overflow in ProtobufParser._readStringKey() allows OutOfMemoryError from an 8-byte payload","titleSource":"HeroDevs","descriptionSource":"HeroDevs","products":[{"vendor":"FasterXML","name":"jackson-dataformat-protobuf","platforms":[],"versions":[{"version":"2.21.6","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-2026-110747"},{"vendor":"FasterXML","name":"jackson-dataformat-protobuf","platforms":[],"versions":[{"version":"3.1.6","status":"affected","lessThan":"3.1.8","versionType":"maven"},{"version":"3.1.8","status":"unaffected","versionType":"maven"},{"version":"3.2.2","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-2026-110747"}],"remediation":[],"description":"ProtobufParser._readStringKey() reads the length prefix of a protobuf map entry's string key into an attacker-controlled int and then checks (_inputPtr + len) <= _inputEnd using signed arithmetic. For values near Integer.MAX_VALUE the addition overflows to a negative value and the check passes even when the input contains no key data. The parser then calls _finishShortText(len), which expands the text buffer to the declared length via TextBuffer.expandCurrentSegment and Arrays.copyOf, throwing OutOfMemoryError: Requested array size exceeds VM limit.\n\n\n\nAn 8-byte malformed message containing a map entry with a declared key length of 0x7FFFFFFF is sufficient. Configured StreamReadConstraints, including maxStringLength, maxNameLength, maxDocumentLength and maxNestingDepth, do not prevent the failure. Applications running with -XX:+ExitOnOutOfMemoryError terminate the JVM.\n\n\n\nThis is the same integer-overflow pattern addressed for other call sites in the remediation associated with CVE-2026-104016 and CVE-2026-104017; the map-key call site was corrected on the 3.x branches only, leaving the corresponding 2.x branches unguarded. Release lines 2.18, 2.19 and 2.20 do not contain _readStringKey() and are not affected by this vector. No privileges or user interaction beyond the ability to submit data for parsing are required. The 3.0 release line and 3.1.0-3.1.5 / 3.2.0-3.2.1 do not contain _readStringKey() and are therefore not affected; the method first appears in 3.1.6 and 3.2.2, mirroring its introduction at 2.21.6 on the 2.x side.","severity":"high","score":7.5,"published":"2026-10-28T00:02:32.462Z","modified":"2026-10-28T00:02:32.462Z","withdrawn":false,"knownExploited":false,"affected":[],"references":["https://github.com/FasterXML/jackson-dataformats-binary/security/advisories/GHSA-fv7v-rrmh-4qcv"],"sources":[{"name":"CVE","id":"CVE-2026-110747","modified":"2026-10-28T00:02:32.462Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-110747"}],"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":"2026-10-29T03:10:35.950Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[]}