CVE-2026-61695Network attack vectorHinoki check available

Process crash via unchecked negative protobuf length

Published Sep 23, 2026 · Updated Sep 23, 2026

Denial of service in Block, Inc. Wire before 6.4.1 and 7.0.0-alpha01 through 7.0.0-alpha03 allows remote attackers to crash Swift processes. ProtoReader.skipGroup() passes a negative LENGTH_DELIMITED count through an upper-bound-only ReadBuffer check to Foundation Data, which raises an unrecoverable process trap. Any process that decodes untrusted protobuf bytes is exposed without authentication, user interaction, or knowledge of its message schema.

CVSS severityUnavailable
Unscored
EPSS probability0.58%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Denial of service in Block, Inc. Wire before 6.4.1 and 7.0.0-alpha01 through 7.0.0-alpha03 allows remote attackers to crash Swift processes. ProtoReader.skipGroup() passes a negative LENGTH_DELIMITED count through an upper-bound-only ReadBuffer check to Foundation Data, which raises an unrecoverable process trap. Any process that decodes untrusted protobuf bytes is exposed without authentication, user interaction, or knowledge of its message schema.

The record

CVE
CVE-2026-61695
Published
Sep 23, 2026
Updated
Sep 23, 2026
Vendor
Block, Inc.
Product
Wire
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 23, 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=< 6.4.1
  2. Affected versionversion=>= 7.0.0-alpha01, < 7.0.0-alpha04

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Block, Inc. · Wireversion=< 6.4.1; version=>= 7.0.0-alpha01, < 7.0.0-alpha04

Published CVSS scores

No CVSS assessment is available in this record.

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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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