CVE-2026-45799 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-45799HIGH

square wire — Wire: skipGroup() missing negative-length check allows 10-byte payload to crash any Wire-decoding service

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  N  N  H    7.5   .0055   43.4     —

AFFECTED
  Product  Versions   Fixed
  wire     < 6.3.0 –  —

TIMELINE
  May 13  Reserved by GitHub_M
  Jul 17  EXPLOIT PUBLISHED — CVE-2026-45799 (square wire). Public exploit reference added.
  Jul 17  Published (CNA: GitHub_M)
  Aug 12  EXPLOIT PUBLISHED — CVE-2026-45799 (square wire). Public exploit reference added.

CWE-129 · CNA: GitHub_M · CVSS v3.1 · 7 references · NVD status: Analyzed

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.

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
May 13, 2026	Reserved	Reserved by GitHub_M
July 17, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-45799 (square wire). Public exploit reference added.
July 17, 2026	Published	Published (CNA: GitHub_M)
August 12, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-45799 (square wire). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
square	wire	—	< 6.3.0	—

Weaknesses

CWE-129

References (7)

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 Advisory, Exploit]

Authoritative record: CVE-2026-45799 at cve.org

Vendors: square

Weaknesses: CWE-129

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-45799 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.