CVE-2026-45799
Wire: skipGroup() missing negative-length check allows 10-byte payload to crash any Wire-decoding service
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| maven | com.squareup.wire:wire-runtime | <= 6.2.0 | 6.3.0 |
| maven | com.squareup.wire:wire-runtime-jvm | <= 6.2.0 | 6.3.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Squareup | Wire | before 6.3.0 Version 7.0.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-7xpr-hc2w-34m9
- https://github.com/square/wire/security/advisories/GHSA-7xpr-hc2w-34m9
- https://github.com/square/wire/pull/3595
- https://github.com/square/wire/pull/3597
- https://nvd.nist.gov/vuln/detail/CVE-2026-45799
- https://github.com/square/wire/commit/47d5b0dba53935d5332cd41a80a353b3fc90e7b0
- https://github.com/square/wire/commit/e4e56fab38a547d9625f05c97f1d8f0bcc3a5773
- https://github.com/square/wire/releases/tag/6.3.0
- https://github.com/square/wire/releases/tag/7.0.0-alpha03