jackson-dataformat-protobuf: integer overflow in ProtobufParser._readStringKey() allows OutOfMemoryError from an 8-byte payload

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-110747
StatePUBLISHED
AssignerHeroDevs
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-28 01:16:55 UTC
Updated2026-11-06 19:17:08 UTC
DescriptionProtobufParser._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. An 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. This 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from 36c7be3b-2937-45df-85ea-ca7133ea542c

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.003870000 probability, percentile 0.331090000 (date 2026-11-08)

Problem Types: CWE-190 | CWE-190 CWE-190 Integer Overflow or Wraparound

VersionSourceTypeScoreSeverityVector
3.136c7be3b-2937-45df-85ea-ca7133ea542cSecondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNACVSS7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA FasterXML Jackson-dataformat-protobuf affected 2.21.6 2.21.8 maven Not specified
CNA FasterXML Jackson-dataformat-protobuf unaffected 2.21.8 maven Not specified
CNA FasterXML Jackson-dataformat-protobuf affected 2.22.0 2.22.4 maven Not specified
CNA FasterXML Jackson-dataformat-protobuf unaffected 2.22.4 maven Not specified
CNA FasterXML Jackson-dataformat-protobuf affected 3.1.6 3.1.8 maven Not specified
CNA FasterXML Jackson-dataformat-protobuf unaffected 3.1.8 maven Not specified
CNA FasterXML Jackson-dataformat-protobuf affected 3.2.2 3.2.4 maven Not specified
CNA FasterXML Jackson-dataformat-protobuf unaffected 3.2.4 maven Not specified

References

ReferenceSourceLinkTags
github.com/FasterXML/jackson-dataformats-binary/security/advisories/GHSA... 36c7be3b-2937-45df-85ea-ca7133ea542c github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: bewithyash (en)

CNA: cowtowncoder (Tatu Saloranta) (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-10-20T22:45:00.000ZGHSA-fv7v-rrmh-4qcv published by the maintainer in FasterXML/jackson-dataformats-binary

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