CVE-2026-45799: Wire provides gRPC and protocol buffers for Android, Kotlin, Swift, and Java

Q: How do I fix CVE-2026-45799?

wire: upgrade to 6.3.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-45799 being exploited?

CVE-2026-45799 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-45799 affect?

CVE-2026-45799 affects wire. Severity is high (CVSS 7.5). 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 len

Q: How urgent is CVE-2026-45799?

Priority 50/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2026-45799 is a high-severity flaw (CVSS 7.5) affecting wire. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 ArrayIndexOutOfBound

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 46%)
CISA exploited list	No
Weakness	CWE-129
Published	2026-07-17
Last modified	2026-10-24

Publisher (CNA): GitHub, Inc. · Vendor: squareup

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-17 20:17 UTCPublished CVE record published
2026-10-24 20:10 UTCUpdated Record last modified

squareup wire UPGRADE

Affected: < 6.3.0 · 7.0.0 alpha01 · 7.0.0 alpha02

Fixed in: 6.3.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy wire || rpm -q wire || wire --version

2. UPGRADE to 6.3.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade wire

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade wire

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

Maven · com.squareup.wire:wire-runtime · FIXED · 6.3.0 · vulnerable: <= 6.2.0 · source

Set com.squareup.wire:wire-runtime to 6.3.0 or later in pom.xml or build.gradle, then rebuild and redeploy.

Maven · com.squareup.wire:wire-runtime-jvm · FIXED · 6.3.0 · vulnerable: <= 6.2.0 · source

Set com.squareup.wire:wire-runtime-jvm to 6.3.0 or later in pom.xml or build.gradle, then rebuild and redeploy.

Fedora 46 · perl-Alien-Brotli · FIXED · 0.2.2-16.fc46 · FEDORA-2026-a2abe3db79 · source

sudo dnf upgrade --advisory=FEDORA-2026-a2abe3db79

Fedora ELN · mariadb-connector-odbc · FIXED · 3.2.10-1.eln159 · FEDORA-2026-b481dcd597 · source

sudo dnf upgrade --advisory=FEDORA-2026-b481dcd597

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-45799?

wire: upgrade to 6.3.0. Exact commands for each OS are on this page.

Is CVE-2026-45799 being exploited?

CVE-2026-45799 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-45799 affect?

CVE-2026-45799 affects wire. Severity is high (CVSS 7.5). 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 len

How urgent is CVE-2026-45799?

Priority 50/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Java vulnerabilities · Android vulnerabilities · Kotlin vulnerabilities · Swift vulnerabilities

References

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