CVE-2026-1584

Summary

A flaw was found in gnutls. A remote, unauthenticated attacker can exploit this vulnerability by sending a specially crafted ClientHello message with an invalid Pre-Shared Key (PSK) binder value during the TLS handshake. This can lead to a NULL pointer dereference, causing the server to crash and resulting in a remote Denial of Service (DoS) condition.

Affected Software

Weaknesses

• CWE-476: NULL Pointer Dereference

Workarounds

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: partial

gnutls: gnutls: Remote Denial of Service via crafted ClientHello with invalid PSK binder

Additional References

• https://access.redhat.com/security/cve/CVE-2026-1584
• https://bugzilla.redhat.com/show_bug.cgi?id=2435258
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-1584.json
• https://access.redhat.com/errata/RHSA-2026:7477

References

• https://access.redhat.com/errata/RHSA-2026:7477
• https://access.redhat.com/security/cve/CVE-2026-1584
• https://bugzilla.redhat.com/show_bug.cgi?id=2435258

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