CVE-2026-32283
Received Received - Intake
TLS 1.3 Key Update Deadlock Causes Denial of Service

Publication date: 2026-04-08

Last updated on: 2026-04-16

Assigner: Go Project

Description
If one side of the TLS connection sends multiple key update messages post-handshake in a single record, the connection can deadlock, causing uncontrolled consumption of resources. This can lead to a denial of service. This only affects TLS 1.3.
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Meta Information
Published
2026-04-08
Last Modified
2026-04-16
Generated
2026-06-16
AI Q&A
2026-04-08
EPSS Evaluated
2026-06-15
NVD
CVE-2026-32283
EUVD
EUVD-2026-20014
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
golang go to 1.25.9 (exc)
golang go From 1.26.0 (inc) to 1.26.2 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-770 The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.
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Executive Summary

CVE-2026-32283 is a vulnerability in the Go standard library's crypto/tls package that affects TLS 1.3 connections. It occurs when one side of a TLS connection sends multiple key update messages after the handshake phase within a single record. This causes the connection to deadlock, which leads to uncontrolled consumption of resources.

Impact Analysis

The vulnerability can cause the TLS connection to deadlock, resulting in uncontrolled resource consumption. This can lead to a denial of service (DoS) condition, where the affected system or application becomes unresponsive or unable to handle legitimate requests.

Mitigation Strategies

To mitigate this vulnerability, you should upgrade the Go programming language to a fixed version that addresses the issue.

  • Upgrade to Go version 1.25.9 or later if you are using a 1.25.x release.
  • If using Go 1.26.0-0 up to but not including 1.26.2, upgrade to at least 1.26.2 or later.

These updates include the fix for the deadlock caused by multiple key update messages in TLS 1.3 connections, preventing uncontrolled resource consumption and denial of service.

Compliance Impact

The provided information does not specify any direct impact of this vulnerability on compliance with common standards and regulations such as GDPR or HIPAA.

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