RHSA-2026:97386 - Security Advisory

Topic

An update for go-fdo-client is now available for Red Hat Enterprise Linux 10.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

go-fdo-client is the device-side implementation of FIDO Device Onboard specification in Go. It provides an FDO client that interacts with FDO manufacturer and owner servers to perform device on-boarding.

Security Fix(es):

• crypto/x509: Incorrect enforcement of email constraints in crypto/x509 (CVE-2026-27137)
• net/url: Incorrect parsing of IPv6 host literals in net/url (CVE-2026-25679)
• net: golang: Go net package: Denial of Service via long CNAME response in LookupCNAME (CVE-2026-33811)
• golang.org/x/net/idna: golang: net/http: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing (CVE-2026-39821)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the Red Hat Enterprise Linux 10 Release Notes linked from the References section.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat Enterprise Linux for x86_64 10 x86_64
• Red Hat Enterprise Linux for ARM 64 10 aarch64

Fixes

• BZ - 2445345 - CVE-2026-27137 crypto/x509: Incorrect enforcement of email constraints in crypto/x509
• BZ - 2445356 - CVE-2026-25679 net/url: Incorrect parsing of IPv6 host literals in net/url
• BZ - 2467822 - CVE-2026-33811 net: golang: Go net package: Denial of Service via long CNAME response in LookupCNAME
• BZ - 2480756 - CVE-2026-39821 golang.org/x/net/idna: golang: net/http: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing

CVEs

• CVE-2026-25679
• CVE-2026-27137
• CVE-2026-33811
• CVE-2026-39821

References

• https://access.redhat.com/security/updates/classification/#important
• https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/10/html/10.3_release_notes/index