Red Hat Security Advisory: golang security update

Fixed packages 8

Vulnerabilities 7

• Critical 9.8
  CVE-2026-27143

  Missing bound checks can lead to memory corruption in safe Go in cmd/compile

  Arithmetic over induction variables in loops were not correctly checked for underflow or overflow. As a result, the compiler would allow for invalid indexing to occur at runtime, potentially leading to memory corruption.

  Go toolchain cmd/compile katib-suggestion-hyperopt katib-earlystopping Debian Ubuntu Azure Linux Alpine Wolfi Go
  Apr 8, 2026
• High 8.8
  CVE-2026-27140

  Code execution vulnerability in SWIG code generation in cmd/go

  SWIG file names containing 'cgo' and well-crafted payloads could lead to code smuggling and arbitrary code execution at build time due to trust layer bypass.

  Go toolchain cmd/go golang go Debian Ubuntu Azure Linux Alpine Wolfi Go
  Apr 8, 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-2026-32281

  Inefficient policy validation in crypto/x509

  Validating certificate chains which use policies is unexpectedly inefficient when certificates in the chain contain a very large number of policy mappings, possibly causing denial of service. This only affects validation of otherwise trusted certificate chain…

  Go standard library crypto/x509 golang go Debian Ubuntu Azure Linux Alpine Wolfi Go
  Apr 8, 2026
• High 7.5
  CVE-2026-32283

  Unauthenticated TLS 1.3 KeyUpdate record can cause persistent connection retention and DoS in crypto/tls

  If one side of the TLS connection sends multiple key update messages post-handshake in a single record, the connection can deadlock, causing uncontrolled consumption of resources. This can lead to a denial of service. This only affects TLS 1.3.

  Go standard library crypto/tls golang go Debian Ubuntu Azure Linux Alpine Wolfi Go
  Apr 8, 2026
• High 7.1
  CVE-2026-27144

  Miscompilation allows memory corruption via CONVNOP-wrapped array copy in cmd/compile

  The compiler is meant to unwrap pointers which are the operands of a memory move; a no-op interface conversion prevented the compiler from making the correct determination about non-overlapping moves, potentially leading to memory corruption at runtime.

  Go toolchain cmd/compile katib-suggestion-hyperopt katib-earlystopping Debian Ubuntu Azure Linux Alpine Wolfi Go
  Apr 8, 2026
• Medium 6.4
  CVE-2026-32282

  TOCTOU permits root escape on Linux via Root.Chmod in os in internal/syscall/unix

  On Linux, if the target of Root.Chmod is replaced with a symlink while the chmod operation is in progress, Chmod can operate on the target of the symlink, even when the target lies outside the root. The Linux fchmodat syscall silently ignores the AT_SYMLINK_N…

  Go standard library internal/syscall/unix golang go Debian Ubuntu Azure Linux Alpine Wolfi Go
  Apr 8, 2026

References

• article
  https://access.redhat.com/security/updates/classification/#important
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2456336
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2456338
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2456339
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2456340
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2456341
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2456342
• advisory
  https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_16021.json
• report
  https://access.redhat.com/security/cve/CVE-2026-27140
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-27140
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-27140
• article
  https://go.dev/cl/763768
• article
  https://go.dev/issue/78335
• article
  https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU
• advisory
  https://pkg.go.dev/vuln/GO-2026-4871
• report
  https://access.redhat.com/security/cve/CVE-2026-27143
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-27143
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-27143
• article
  https://go.dev/cl/763765
• article
  https://go.dev/issue/78333
• advisory
  https://pkg.go.dev/vuln/GO-2026-4868
• report
  https://access.redhat.com/security/cve/CVE-2026-27144
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-27144
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-27144
• article
  https://go.dev/cl/763764
• article
  https://go.dev/issue/78371
• advisory
  https://pkg.go.dev/vuln/GO-2026-4867
• 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
• advisory
  https://pkg.go.dev/vuln/GO-2026-4947
• report
  https://access.redhat.com/security/cve/CVE-2026-32281
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2456333
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-32281
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-32281
• article
  https://go.dev/cl/758061
• article
  https://go.dev/issue/78281