CVE-2026-1584Network attack vector

Remote server crash via invalid PSK binder

Published Apr 9, 2026 · Updated Apr 9, 2026

Denial of service in GnuTLS in Red Hat Hardened Images allows remote attackers to crash TLS servers through a crafted ClientHello. In lib/ext/pre_shared_key.c, _gnutls_psk_recv_params() passes a null PSK credential pointer to server_recv_params(), which dereferences binder_algo after an invalid binder comparison. The server must issue a TLS 1.3 NewSessionTicket, and the client must resume with that ticket identity and a same-length but incorrect binder; the consequence is a repeatable process crash.

CVSS severity7.5
High
EPSS probability1.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in GnuTLS in Red Hat Hardened Images allows remote attackers to crash TLS servers through a crafted ClientHello. In lib/ext/pre_shared_key.c, _gnutls_psk_recv_params() passes a null PSK credential pointer to server_recv_params(), which dereferences binder_algo after an invalid binder comparison. The server must issue a TLS 1.3 NewSessionTicket, and the client must resume with that ticket identity and a same-length but incorrect binder; the consequence is a repeatable process crash.

The record

CVE
CVE-2026-1584
Published
Apr 9, 2026
Updated
Apr 9, 2026
Vendor
389 Directory Server
Product
Red Hat Hardened Images
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

389 Directory Server · Red Hat Hardened ImagesAffected versions are unavailable in this record.

Published CVSS scores

7.5Red Hat, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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