RHSA-2026:39810 - Security Advisory

Topic

An update for golang-github-openstack-k8s-operators-os-diff is now
available for Red Hat OpenStack Services on OpenShift 18.0 (Antelope).

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

Security Fix(es):

• net/url: Memory exhaustion in query parameter parsing in net/url

(CVE-2025-61726)

• golang: Denial of Service due to excessive resource consumption via

crafted certificate (CVE-2025-61729)

• Incorrect parsing of IPv6 host literals in net/url (CVE-2026-25679)
• Incorrect enforcement of email constraints in crypto/x509

(CVE-2026-27137)

• crypto/tls: golang: Go: Denial of Service vulnerability in certificate

chain building (CVE-2026-32280)

• golang: Go crypto/tls: Denial of Service via multiple TLS 1.3 key update

messages (CVE-2026-32283)

• golang: Go crypto/x509: Certificate validation bypass due to incorrect

DNS constraint application (CVE-2026-33810)

• golang: Go net package: Denial of Service via long CNAME response in

LookupCNAME (CVE-2026-33811)

• golang: Go crypto/x509: Denial of Service via inefficient certificate

chain validation (CVE-2026-32281)

• internal/syscall/unix: Root.Chmod can follow symlinks out of the root

(CVE-2026-32282)

For more details about the security issue(s), including the impact, a CVSS
score, acknowledgments, and other related information, refer to the CVE
page listed in 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 9 x86_64
• Red Hat OpenStack Services on OpenShift 18.0 x86_64

Fixes

• BZ - 2418462 - CVE-2025-61729 crypto/x509: golang: Denial of Service due to excessive resource consumption via crafted certificate
• BZ - 2434432 - CVE-2025-61726 golang: net/url: Memory exhaustion in query parameter parsing in net/url
• 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 - 2456333 - CVE-2026-32281 crypto/x509: golang: Go crypto/x509: Denial of Service via inefficient certificate chain validation
• BZ - 2456335 - CVE-2026-33810 crypto/x509: golang: Go crypto/x509: Certificate validation bypass due to incorrect DNS constraint application
• BZ - 2456336 - CVE-2026-32282 golang: internal/syscall/unix: Root.Chmod can follow symlinks out of the root
• BZ - 2456338 - CVE-2026-32283 crypto/tls: golang: Go crypto/tls: Denial of Service via multiple TLS 1.3 key update messages
• BZ - 2456339 - CVE-2026-32280 crypto/x509: crypto/tls: golang: Go: Denial of Service vulnerability in certificate chain building
• BZ - 2467822 - CVE-2026-33811 net: golang: Go net package: Denial of Service via long CNAME response in LookupCNAME

CVEs

• CVE-2025-61726
• CVE-2025-61729
• CVE-2026-25679
• CVE-2026-27137
• CVE-2026-32280
• CVE-2026-32281
• CVE-2026-32282
• CVE-2026-32283
• CVE-2026-33810
• CVE-2026-33811

References

• https://access.redhat.com/security/updates/classification/#important