Vulnerability Report

CVE-2026-45799

Title: Wire ProtoReader DoS via negative length

Other

Proof Of Concept

No public PoC currently indexed for CVE-2026-45799.

CWE Category CWE-129

Published Date Jul 17, 2026

Modified Date Aug 12, 2026

Exploit Status Not Found

Score 7.5 CVSS v3.1

Exploit Probability (EPSS)

0.73%

Vulnerability Summary

CVE-2026-45799: 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.

Impacted Vendors

asynkron 1

squareup 1

Reference Links

https://github.com/square/wire/commit/47d5b0dba53935d5332cd41a80a353b3fc90e7b0 https://github.com/square/wire/commit/e4e56fab38a547d9625f05c97f1d8f0bcc3a5773 https://github.com/square/wire/pull/3595 https://github.com/square/wire/pull/3597 https://github.com/square/wire/releases/tag/6.3.0 https://github.com/square/wire/releases/tag/7.0.0-alpha03 https://github.com/square/wire/security/advisories/GHSA-7xpr-hc2w-34m9

CVSS v3.1

Source Entity [email protected]

Severity HIGH

7.5

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Associated Attack Patterns (CAPEC)

Total: Patterns