Wire Swift runtime: negative LENGTH_DELIMITED length in skipGroup() crashes any protobuf-decoding service

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-61695
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-23 19:17:32 UTC
Updated2026-09-30 19:38:27 UTC
DescriptionWire provides gRPC and protocol buffers for Android, Kotlin, Swift, and Java. Prior to 6.4.1 and 7.0.0-alpha04, Wire's Swift runtime ProtoReader.skipGroup(expectedEndTag:unknownFieldsWriter:) accepts a negative length for a LENGTH_DELIMITED field inside an unknown START_GROUP field. ProtoReader.readData() forwards the negative count to ReadBuffer.readData(count:), whose upper-bound-only check permits the value to reach Foundation Data(bytes:count:) and trigger an unrecoverable process trap instead of a catchable ProtoDecoder.Error. Any Swift process decoding untrusted protobuf bytes can be crashed without authentication, user interaction, or knowledge of the target schema. This issue is fixed in versions 6.4.1 and 7.0.0-alpha04.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

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

EPSS: 0.005800000 probability, percentile 0.455350000 (date 2026-09-29)

Problem Types: CWE-129 | CWE-129 CWE-129: Improper Validation of Array Index

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS: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 Square Wire affected < 6.4.1 Not specified
CNA Square Wire affected >= 7.0.0-alpha01, < 7.0.0-alpha04 Not specified

References

ReferenceSourceLinkTags
github.com/square/wire/security/advisories/GHSA-86wm-r4c5-2rc9 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/square/wire/releases/tag/6.4.1 [email protected] github.com
github.com/square/wire/commit/24043b6b3a5e5974a978f2745b76d50b31407c1c [email protected] github.com
github.com/square/wire/commit/81ff7f24a6795d9a8be2e03f272b2d979a5d2c7e [email protected] github.com
github.com/square/wire/pull/3616 [email protected] github.com
github.com/square/wire/releases/tag/7.0.0-alpha04 [email protected] github.com
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