High 7.5Published Jul 17, 2026

CVE-2026-45799Wire: skipGroup() missing negative-length check allows 10-byte payload to crash any Wire-decoding service

Updated under an hour ago (Oct 27, 2026, 4:50 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 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.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-129
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Jul 20, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

square wire square:wire (from the name)	before 6.3.0; from 7.0.0-alpha01, < 7.0.0-alpha03	CNA record
squareup wire squareup:wire	before 6.3.0; 7.0.0; 7.0.0	NVD

References

References

https://github.com/square/wire/security/advisories/GHSA-7xpr-hc2w-34m9	x-refsource-confirm, vendor-advisory, exploit
https://github.com/square/wire/pull/3595	x-refsource-misc, issue-tracking
https://github.com/square/wire/pull/3597	x-refsource-misc, issue-tracking
https://github.com/square/wire/commit/47d5b0dba53935d5332cd41a80a353b3fc90e7b0	x-refsource-misc, patch
https://github.com/square/wire/commit/e4e56fab38a547d9625f05c97f1d8f0bcc3a5773	x-refsource-misc, patch
https://github.com/square/wire/releases/tag/6.3.0	x-refsource-misc, release-notes
https://github.com/square/wire/releases/tag/7.0.0-alpha03	x-refsource-misc, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.