CVE-2026-45799: Squareup Wire

High severity, CVSS 7.5. EPSS: 0.7% chance of exploitation in the next 30 days.

Wire provides gRPC and protocol buffers for Android, Kotlin, Swift, and Java. Prior to 6.3.0 and 7.0.0-alpha03, ByteArrayProtoReader32.skipGroup() and ProtoReader.skipGroup() in wire-runtime do not validate that a LENGTH_DELIMITED field length is non-negative before skip(), allowing a crafted protobuf varint encoding -128 as a signed Int to make skip(-128) move the internal position negative and make the next readByte() throw ArrayIndexOutOfBoundsException instead of the documented IOException or ProtocolException, which can crash services using ProtoAdapter.decode(byte[]) on untrusted payloads. This issue is fixed in versions 6.3.0 and 7.0.0-alpha03.

Affected products

• Squareup Wire: before 6.3.0 (fixed in 6.3.0); version 7.0.0 only

Published 2026-07-17. Last modified 2026-08-12.