Vulnerability record · CVE-2026-45799 · published 17 July 2026
CVE-2026-45799: Squareup wire vulnerability
Squareup · Wire
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.
Description
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.
References
| Link | Tags |
|---|---|
| https://github.com/square/wire/commit/47d5b0dba53935d5332cd41a80a353b3fc90e7b0 | Patch |
| https://github.com/square/wire/commit/e4e56fab38a547d9625f05c97f1d8f0bcc3a5773 | Patch |
| https://github.com/square/wire/pull/3595 | Issue Tracking |
| https://github.com/square/wire/pull/3597 | Issue Tracking |
| https://github.com/square/wire/releases/tag/6.3.0 | Release Notes |
| https://github.com/square/wire/releases/tag/7.0.0-alpha03 | Release Notes |
| https://github.com/square/wire/security/advisories/GHSA-7xpr-hc2w-34m9 | Vendor AdvisoryExploit |
| https://github.com/square/wire/security/advisories/GHSA-7xpr-hc2w-34m9 | Vendor AdvisoryExploit |
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Related vulnerabilities
Same products first, then exploited flaws of the same weakness class.
Source: NIST National Vulnerability Database (record CVE-2026-45799), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.
