Red Hat Security Advisory: buildah security update

Fixed packages 5

Vulnerabilities 4

• Critical 9.1
  CVE-2026-39830

  Invoking client can cause server deadlock on unexpected responses in golang.org/x/crypto/ssh

  A malicious SSH peer could send unsolicited global request responses to fill an internal buffer, blocking the connection's read loop. The blocked goroutine could not be released by calling Close(), resulting in a resource leak per connection. Unsolicited glob…

  golang.org/x/crypto golang.org/x/crypto/ssh zot kubescape Debian Ubuntu Azure Linux Wolfi Go
  May 22, 2026
• Critical 9.1
  CVE-2026-39832

  Invoking agent constraints dropped when forwarding keys in golang.org/x/crypto/ssh/agent

  When adding a key to a remote agent constraint extensions such as restrict-destination-v00@openssh.com were not serialized in the request. Destination restrictions were silently stripped when forwarding keys, allowing unrestricted use of the key on the remote…

  golang.org/x/crypto golang.org/x/crypto/ssh/agent zot kubescape Debian Ubuntu Azure Linux Wolfi Go
  May 22, 2026
• High 7.5
  CVE-2026-39829

  Invoking pathological RSA/DSA parameters may cause DoS in golang.org/x/crypto/ssh

  The RSA and DSA public key parsers did not enforce size limits on key parameters. A crafted public key with an excessively large modulus or DSA parameter could cause several minutes of CPU consumption during signature verification. This could be triggered by …

  golang.org/x/crypto golang.org/x/crypto/ssh zot kubescape Debian Ubuntu Azure Linux Wolfi Go
  May 22, 2026
• Medium 5.3
  CVE-2026-39835

  Invoking server panic during CheckHostKey/Authenticate in golang.org/x/crypto/ssh

  SSH servers which use CertChecker as a public key callback without setting IsUserAuthority or IsHostAuthority could be caused to panic by a client presenting a certificate. CertChecker now returns an error instead of panicking when these callbacks are nil.

  golang.org/x/crypto golang.org/x/crypto/ssh zot kubescape Debian Ubuntu Azure Linux Wolfi Go
  May 22, 2026

References

• article
  https://access.redhat.com/security/updates/classification/#important
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2480680
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2480681
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2480684
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2480685
• advisory
  https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_36199.json
• report
  https://access.redhat.com/security/cve/CVE-2026-39829
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-39829
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-39829
• article
  https://go.dev/cl/781641
• article
  https://go.dev/cl/781661
• article
  https://go.dev/issue/79565
• article
  https://groups.google.com/g/golang-announce/c/a082jnz-LvI
• advisory
  https://pkg.go.dev/vuln/GO-2026-5018
• report
  https://access.redhat.com/security/cve/CVE-2026-39830
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-39830
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-39830
• article
  https://go.dev/cl/781640
• article
  https://go.dev/cl/781664
• article
  https://go.dev/issue/79564
• advisory
  https://pkg.go.dev/vuln/GO-2026-5017
• report
  https://access.redhat.com/security/cve/CVE-2026-39832
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-39832
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-39832
• article
  https://go.dev/cl/778642
• article
  https://go.dev/issue/79435
• advisory
  https://pkg.go.dev/vuln/GO-2026-5006
• report
  https://access.redhat.com/security/cve/CVE-2026-39835
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-39835
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-39835
• article
  https://go.dev/cl/781660
• article
  https://go.dev/issue/79563
• advisory
  https://pkg.go.dev/vuln/GO-2026-5015