CVE-2026-61695
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.
What this means for your business
- An attacker can use it remotely, over a network, without a login, and without anyone at your company clicking anything.
What to do
- 1Ask your IT team or provider whether any of your systems use the affected product.
- 2If you do, follow the vendor's guidance. No patch reference has been published yet.
Not sure if your company is exposed?
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Scoring
- CVSS
- 7.5 (v3.1)
- Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Weakness
- CWE-129
- Assigned by
- security-advisories@github.com
Dates
- Published
- 2026-09-23
- Last modified
- 2026-09-23
- Sources
- NVD
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