Improper Validation of Array Index in wire - CVE-2026-61695
Published: November 10, 2026
Vulnerability identifier: #VU164388
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-61695
CWE-ID: CWE-129
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service by aborting a process decoding untrusted protobuf data with Wire's Swift runtime.
The vulnerability exists due to missing validation of negative lengths in ProtoReader.skipGroup() and ReadBuffer.readData(count:) when skipping unknown protobuf groups. A remote attacker can send the payload 9b060a80ffffff0f9c06, containing a LENGTH_DELIMITED field whose length decodes to -128, to trigger an unrecoverable trap in Foundation's Data(bytes:count:) and terminate the process.
Affected software
wire
How to mitigate CVE-2026-61695
Install security update from vendor's website.
wire - update to 6.4.1