CVE-2026-42504 Details
Description
Decoding a maliciously-crafted MIME header containing many invalid encoded-words can consume excessive CPU.
A denial-of-service vulnerability has been identified in the Go programming language's standard library, specifically within the MIME package. The issue arises in the WordDecoder.DecodeHeader function, which can be subjected to a denial-of-service attack by decoding a maliciously-crafted MIME header. This header can contain numerous invalid encoded-words, leading to excessive CPU consumption. The vulnerability affects Go versions prior to 1.25.11, as well as versions from 1.26.0 up to but not including 1.26.4.
Users can upgrade to Go versions 1.26.4 or 1.25.11, both of which include the necessary fix. Instructions for downloading these versions are available on the Go website.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jun 3, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-407 | Inefficient Algorithmic Complexity | CISA-ADP |
Affected Products
No affected product data is available for this CVE.
Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 22, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jun 3, 2026 | CVE Modified | CISA-ADP |
| Jun 2, 2026 | New CVE Received | [email protected] |