CVE-2026-45799Public exploitNetwork attack vector

Service crash via negative protobuf group length

Published Jul 17, 2026 · Updated Jul 17, 2026

Denial of service in Wire before 6.3.0 and 7.0.0-alpha01 through 7.0.0-alpha02 allows remote attackers to crash decoding services. ByteArrayProtoReader32.skipGroup() and ProtoReader.skipGroup() accept a negative LENGTH_DELIMITED length and move the reader position backward before an unchecked array access. A service is exposed only when it decodes untrusted protobuf data and does not catch the resulting unchecked runtime exception.

CVSS severity7.5
High
EPSS probability0.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Wire before 6.3.0 and 7.0.0-alpha01 through 7.0.0-alpha02 allows remote attackers to crash decoding services. ByteArrayProtoReader32.skipGroup() and ProtoReader.skipGroup() accept a negative LENGTH_DELIMITED length and move the reader position backward before an unchecked array access. A service is exposed only when it decodes untrusted protobuf data and does not catch the resulting unchecked runtime exception.

The record

CVE
CVE-2026-45799
Published
Jul 17, 2026
Updated
Jul 17, 2026
Vendor
Block, Inc.
Product
Wire
Classifications
CWE-129, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 6.3.0
  2. Affected versionversion=>= 7.0.0-alpha01, < 7.0.0-alpha03

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Block, Inc. · Wireversion=< 6.3.0; version=>= 7.0.0-alpha01, < 7.0.0-alpha03

Published CVSS scores

7.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-129Improper Validation of Array Index
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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