SB2026090251 - Red Hat Enterprise Linux 10 update for go-fdo-client
Published: September 2, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 4 vulnerabilities.
1) Improper Certificate Validation (CVE-ID: CVE-2026-33810)
CWE-ID: CWE-295 - Improper Certificate Validation
CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to bypass certificate name constraints.
The vulnerability exists due to improper certificate validation in the Certificate.Verify function in crypto/x509 when verifying a certificate chain containing excluded DNS constraints and wildcard DNS SANs that use different letter case than the constraint. A remote attacker can present a specially crafted certificate chain to bypass certificate name constraints.
This only affects validation of otherwise trusted certificate chains issued by a root CA in the VerifyOptions.Roots CertPool or in the system certificate pool.
2) Uncontrolled Recursion (CVE-ID: CVE-2026-33818)
CWE-ID: CWE-674 - Uncontrolled Recursion
CVSSv4: 8.7 [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]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled recursion in Unmarshal and UnmarshalWithParams in encoding/asn1 when parsing deeply nested recursive structures. A remote attacker can supply specially crafted ASN.1 input to cause a denial of service.
3) Resource exhaustion (CVE-ID: CVE-2026-56860)
CWE-ID: CWE-400 - Resource exhaustion
CVSSv4: 8.7 [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]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled resource consumption in net/url URL.Parse and URL.ResolveReference when processing relative paths containing parent directory ('..') segments. A remote attacker can send specially crafted input to cause a denial of service.
4) Improper control of a resource through its lifetime (CVE-ID: CVE-2026-56862)
CWE-ID: CWE-664 - Improper control of a resource through its lifetime
CVSSv4: 8.7 [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]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper state management in crypto/tls when processing handshake messages before handshake completion. A remote attacker can send repeated KeyUpdate messages to cause a denial of service.
Remediation
Install update from vendor's website.