Vulnerability Description
Wire 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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/square/wire/commit/24043b6b3a5e5974a978f2745b76d50b31407c1c
- https://github.com/square/wire/commit/81ff7f24a6795d9a8be2e03f272b2d979a5d2c7e
- https://github.com/square/wire/pull/3616
- https://github.com/square/wire/releases/tag/6.4.1
- https://github.com/square/wire/releases/tag/7.0.0-alpha04
- https://github.com/square/wire/security/advisories/GHSA-86wm-r4c5-2rc9
- https://github.com/square/wire/security/advisories/GHSA-86wm-r4c5-2rc9
FAQ
What is CVE-2026-61695?
CVE-2026-61695 is a vulnerability with a CVSS score of 7.5 (HIGH). Wire 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 ...
How severe is CVE-2026-61695?
CVE-2026-61695 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-61695?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.