Red Hat Security Advisory: oci-seccomp-bpf-hook security update

Fixed packages 3

Vulnerabilities 3

• High 7.5
  CVE-2026-56853

  Apply ReadHeaderTimeout when doing unencrypted HTTP/2 check in net/http

  When a server is configured to support unencrypted HTTP/2, it reads a few bytes from each new connection to see if they contain the HTTP/2 client preface. ReadHeaderTimeout is unexpectedly not being applied when doing this.

  Go standard library net/http golang go Debian Ubuntu Azure Linux Alpine Wolfi Go
  Aug 13, 2026
• High 7.5
  CVE-2026-78667

  Lack of limit on size of parsed Range headers in net/http

  When parsing a Range header containing a large number of small ranges, FileServer(FS), ServeContent, and ServeFile(FS) can consume an excessive amount of CPU.

  Go standard library net/http golang go Debian Ubuntu Azure Linux Alpine Wolfi Go
  Oct 8, 2026
• Medium 6.8
  CVE-2026-111943 Public exploit

  Distrust compromised intermediate certificates in crypto/x509

  On most platforms, Go uses the given system root certificates. However, in some narrower cases, the system trust stores may not be updated without further action. To defend against the narrower set of cases that may remain affected, a denylist was added in cr…

  Go standard library crypto/x509 golang go Debian Ubuntu Azure Linux Alpine Wolfi Go crates.io
  Oct 21, 2026

References

• article
  https://access.redhat.com/security/updates/classification/#important
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2515827
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2548334
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2556068
• advisory
  https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_89752.json
• report
  https://access.redhat.com/security/cve/CVE-2026-56853
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-56853
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-56853
• article
  https://go.dev/cl/795540
• article
  https://go.dev/issue/80205
• article
  https://groups.google.com/g/golang-announce/c/94pEornpRlI
• advisory
  https://pkg.go.dev/vuln/GO-2026-6089
• report
  https://access.redhat.com/security/cve/CVE-2026-78667
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-78667
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-78667
• article
  https://go.dev/cl/847309
• article
  https://go.dev/issue/81858
• article
  https://groups.google.com/g/golang-announce/c/U2fTuyDJznI
• advisory
  https://pkg.go.dev/vuln/GO-2026-6609
• report
  https://access.redhat.com/security/cve/CVE-2026-111943
• article
  https://access.redhat.com/security/vulnerabilities/RHSB-2026-012
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-111943
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-111943
• article
  https://github.com/golang/go/issues/82345
• article
  https://groups.google.com/g/golang-nuts/c/K22sG2AYnKU
• advisory
  https://pkg.go.dev/vuln/GO-2026-6809