CVE-2026-42499

HIGH

Quadratic string concatenation in consumePhrase in net/mail

Title source: cna
STIX 2.1

Description

Pathological inputs could cause DoS through consumePhrase when parsing an email address according to RFC 5322.

References (4)

Core 4

Scores

CVSS v3 7.5
EPSS 0.0002
EPSS Percentile 6.4%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

Status published
Products (3)
Go standard library/net/mail < 1.25.10
Go standard library/net/mail 1.26.0-0 - 1.26.3
golang/go < 1.25.10
Published May 07, 2026
Tracked Since May 08, 2026