{"id":"CVE-2026-110747","title":"jackson-dataformat-protobuf: integer overflow in ProtobufParser._readStringKey() allows OutOfMemoryError from an 8-byte payload","summary":"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 ad…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cvssSource":"cna","cwe":["CWE-190"],"vendor":"FasterXML","product":"com.fasterxml.jackson.dataformat:jackson-dataformat-protobuf","affected":["com.fasterxml.jackson.dataformat:jackson-dataformat-protobuf >= 2.21.6 < 2.21.8","com.fasterxml.jackson.dataformat:jackson-dataformat-protobuf >= 2.22.0 < 2.22.4","tools.jackson.dataformat:jackson-dataformat-protobuf >= 3.1.6 < 3.1.8","tools.jackson.dataformat:jackson-dataformat-protobuf >= 3.2.2 < 3.2.4"],"published":"2026-10-28","updated":"2026-10-28","sourceUpdated":"2026-10-28T00:02:32.462Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-110747","references":[{"url":"https://github.com/FasterXML/jackson-dataformats-binary/security/advisories/GHSA-fv7v-rrmh-4qcv","label":"GHSA-fv7v-rrmh-4qcv"}],"tags":["cve.org"],"ingestedAt":"2026-10-28T01:01:24.227Z","slug":"CVE-2026-110747","body":"## Overview\n\nProtobufParser._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.\n\n## Affected\n\n- `com.fasterxml.jackson.dataformat:jackson-dataformat-protobuf >= 2.21.6 < 2.21.8`\n- `com.fasterxml.jackson.dataformat:jackson-dataformat-protobuf >= 2.22.0 < 2.22.4`\n- `tools.jackson.dataformat:jackson-dataformat-protobuf >= 3.1.6 < 3.1.8`\n- `tools.jackson.dataformat:jackson-dataformat-protobuf >= 3.2.2 < 3.2.4`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}