Review reviewHigh

CVE-2026-42499

Go standard library net/mail, Logging Subsystem for Red Hat OpenShift 6.4, Red Hat Advanced Cluster Security 4.9

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

PRIORITY ASSESSMENT

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.80%

Technical severityCVSS 7.5

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

Product: Go standard library net/mail, Logging Subsystem for Red Hat OpenShift 6.4, Red Hat Advanced Cluster Security 4.9
Affected versions: < 1.25.10, >= 1.26.0-0 < 1.26.3, >= 1.26.0 < 1.26.3
Fixed versions: 1.25.10, 1.26.3

Confirm exposure before applying a vendor-supported change.

1
Identify
Confirm that Go standard library net/mail, Logging Subsystem for Red Hat OpenShift 6.4, Red Hat Advanced Cluster Security 4.9 and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.