Bug 2562516 (CVE-2026-104016)

Summary: CVE-2026-104016 com.fasterxml.jackson.dataformat/jackson-dataformat-protobuf: jackson-dataformat-protobuf: Denial of Service via integer overflow during field parsing
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: fmariani, fmongiar, gmalinko, janstey, jnethert, jwon, mcarlett, pdelbell, pjindal, rstepani, tcunning, yfang
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in jackson-dataformat-protobuf. This vulnerability allows a remote attacker to cause a Denial of Service (DoS) by sending specially crafted Protocol Buffers data. Due to an integer overflow during bounds checking for length-prefixed string and byte fields, the parser bypasses validation and attempts an oversized memory allocation, crashing the application.
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Description OSIDB Bzimport 2026-10-28 00:01:31 UTC 
ProtobufParser parses length-prefixed protobuf string and bytes fields by checking (_inputPtr + len) <= _inputEnd and then, on the fast path, calling _finishShortText(len). Both use 32-bit signed integer arithmetic. When an attacker supplies a varint decoding to a length near Integer.MAX_VALUE, _inputPtr + len overflows to a negative value, the bounds check passes, and _finishShortText(len) reaches TextBuffer.expandCurrentSegment(len), which performs Arrays.copyOf with no cap and throws OutOfMemoryError: Requested array size exceeds VM limit.



The JVM refuses arrays larger than Integer.MAX_VALUE - 8 before consulting available heap, so -Xmx tuning does not mitigate the issue. StreamReadConstraints.maxStringLength and maxDocumentLength do not gate this path: a 33-byte payload is far below any document-length cap and the string-length check does not fire before the allocation. This was confirmed empirically against shipping artifacts with maxStringLength, maxDocumentLength and maxNestingDepth all configured.



A February 2026 hardening commit added the equivalent overflow guard to the packed-array-length and message-length paths but left the string-length call sites unguarded. No privileges or user interaction beyond the ability to submit data for parsing are required.