Red Hat Security Advisory: OpenShift Container Platform 4.18.54 packages and security update

Fixed packages 43

Vulnerabilities 7

• High 7.5
  CVE-2026-25679

  Incorrect parsing of IPv6 host literals in net/url

  url.Parse insufficiently validated the host/authority component and accepted some invalid URLs.

  Go standard library net/url langfuse-3-worker katib-suggestion-hyperopt Debian Ubuntu Azure Linux Alpine Wolfi Go
  Mar 6, 2026
• High 7.5
  CVE-2026-32280

  Unexpected work during chain building in crypto/x509

  During chain building, the amount of work that is done is not correctly limited when a large number of intermediate certificates are passed in VerifyOptions.Intermediates, which can lead to a denial of service. This affects both direct users of crypto/x509 an…

  Go standard library crypto/x509 golang go Debian Ubuntu Azure Linux Alpine Wolfi Go
  Apr 8, 2026
• High 7.5
  CVE-2026-33811

  Crash when handling long CNAME response in net

  When using LookupCNAME with the cgo DNS resolver, a very long CNAME response can trigger a double-free of C memory and a crash.

  Go standard library net golang go Debian Ubuntu Azure Linux Alpine Wolfi Go
  May 7, 2026
• High 7.5
  CVE-2026-39820

  Quadratic string concatentation in consumeComment in net/mail

  Well-crafted inputs reaching ParseAddress, ParseAddressList, and ParseDate were able to trigger excessive CPU exhaustion and memory allocations.

  Go standard library net/mail golang go Debian Ubuntu Azure Linux Alpine Wolfi Go
  May 7, 2026
• High 7.5
  CVE-2026-42499

  Quadratic string concatenation in consumePhrase in net/mail

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

  Go standard library net/mail golang go Debian Ubuntu Azure Linux Alpine Wolfi Go
  May 7, 2026
• High 7.5
  CVE-2026-42504

  Quadratic complexity in WordDecoder.DecodeHeader in mime

  Decoding a maliciously-crafted MIME header containing many invalid encoded-words can consume excessive CPU.

  Go standard library mime golang go Debian Ubuntu Azure Linux Alpine Wolfi Go
  Jun 2, 2026
• Medium 6.5
  CVE-2026-27145 Public exploit

  Inefficient candidate hostname parsing in crypto/x509

  (*x509.Certificate).VerifyHostname previously called matchHostnames in a loop over all DNS Subject Alternative Name (SAN) entries. This caused strings.Split(host, ".") to execute repeatedly on the same input hostname. With a large DNS SAN list, verification c…

  Go standard library crypto/x509 golang stdlib Debian Ubuntu Azure Linux Wolfi Go
  Jun 2, 2026

References

• article
  https://access.redhat.com/security/updates/classification/#important
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2445356
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2456339
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2467809
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2467820
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2467822
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2484204
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2484207
• advisory
  https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_57482.json
• report
  https://access.redhat.com/security/cve/CVE-2026-25679
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-25679
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-25679
• article
  https://go.dev/cl/752180
• article
  https://go.dev/issue/77578
• article
  https://groups.google.com/g/golang-announce/c/EdhZqrQ98hk
• advisory
  https://pkg.go.dev/vuln/GO-2026-4601
• report
  https://access.redhat.com/security/cve/CVE-2026-27145
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-27145
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-27145
• article
  https://go.dev/cl/783621
• article
  https://go.dev/issue/79694
• article
  https://groups.google.com/g/golang-announce/c/tKs3rmcBcKw
• advisory
  https://pkg.go.dev/vuln/GO-2026-5037
• report
  https://access.redhat.com/security/cve/CVE-2026-32280
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-32280
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-32280
• article
  https://go.dev/cl/758320
• article
  https://go.dev/issue/78282
• article
  https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU
• advisory
  https://pkg.go.dev/vuln/GO-2026-4947
• report
  https://access.redhat.com/security/cve/CVE-2026-33811
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-33811
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-33811
• article
  https://go.dev/cl/767860
• article
  https://go.dev/issue/78803
• article
  https://groups.google.com/g/golang-announce/c/qcCIEXso47M
• advisory
  https://pkg.go.dev/vuln/GO-2026-4981
• report
  https://access.redhat.com/security/cve/CVE-2026-39820
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-39820