---
title: "CVE-2026-61695: Wire Swift - Denial of Service"
description: "Wire Swift runtime < 6.4.1 and < 7.0.0-alpha04 contains a denial of service caused by accepting negative length in LENGTH_DELIMITED field inside unknown START_GROUP, letting attackers crash the process remotely without authentication."
url: https://panop.io/threat-heartbeat/CVE-2026-61695/
---

# CVE-2026-61695 Wire Swift - Denial of Service

Wire Swift runtime < 6.4.1 and < 7.0.0-alpha04 contains a denial of service caused by accepting negative length in LENGTH\_DELIMITED field inside unknown START\_GROUP, letting attackers crash the process remotely without authentication.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.58% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-61695)

## Details

Type

Denial of Service

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Published

23 September 2026

Updated

15 October 2026

Weakness

[CWE-129](https://cwe.mitre.org/data/definitions/129.html)

## Vendor fix

Update to versions 6.4.1 or 7.0.0-alpha04 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-61695](https://nvd.nist.gov/vuln/detail/CVE-2026-61695)
- [https://github.com/square/wire/releases/tag/7.0.0-alpha04](https://github.com/square/wire/releases/tag/7.0.0-alpha04)
- [https://github.com/square/wire/security/advisories/GHSA-86wm-r4c5-2rc9](https://github.com/square/wire/security/advisories/GHSA-86wm-r4c5-2rc9)
- [https://github.com/square/wire/commit/24043b6b3a5e5974a978f2745b76d50b31407c1c](https://github.com/square/wire/commit/24043b6b3a5e5974a978f2745b76d50b31407c1c)
- [https://github.com/square/wire/commit/81ff7f24a6795d9a8be2e03f272b2d979a5d2c7e](https://github.com/square/wire/commit/81ff7f24a6795d9a8be2e03f272b2d979a5d2c7e)
- [https://github.com/square/wire/pull/3616](https://github.com/square/wire/pull/3616)
- [https://github.com/square/wire/releases/tag/6.4.1](https://github.com/square/wire/releases/tag/6.4.1)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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