Resource exhaustion in Go programming language - CVE-2026-42499
Published: July 31, 2026
Vulnerability identifier: #VU140615
CSH Severity: Medium
CVSS v4 BT: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2026-42499
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled resource consumption in net/mail consumePhrase when parsing an email address according to RFC 5322. A remote attacker can supply a pathological email address input to cause a denial of service.
Affected software
Go programming language
How to mitigate CVE-2026-42499
Install security update from vendor's website.
Go programming language - addressed in versions 1.25.10, 1.26.3