CVE-2026-1584 | Gnutls: gnutls: remote denial of service via crafted clienthello with invalid psk binder

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.

Published: 2026-04-09 Last update: 2026-05-03 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-1584 is rated Moderate Risk (54.8/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.33%). EPSS rose +1.25% over the last day, indicating growing attacker interest. Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-1584

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.08% 1.33% +1.25%
2 2026-04-10 — 0.08% —

Full EPSS history (2 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-1584

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]

Weakness enumeration for CVE-2026-1584

GitHub Security Advisory for CVE-2026-1584

GHSA-92xv-mw29-x4px · Severity: high — A flaw was found in gnutls. A remote, unauthenticated attacker can exploit this vulnerability by...

OS Trackers for CVE-2026-1584

vendor priority summary link
alpine — CVE-2026-1584: 1 source package rows (gnutls); 5 state rows across 5 repos (3.20-main, 3.21-main, 3.22-main, 3.23-main, edge-main); fixed 5, open 0. https://security.alpinelinux.org/vuln/CVE-2026-1584
debian unimportant CVE-2026-1584 unimportant priority: Debian including 1 source packages (gnutls28), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2026-1584
redhat high — https://access.redhat.com/security/cve/CVE-2026-1584
suse high CVE-2026-1584 severity important: SUSE including 25 source package names (gnutls, gnutls-3.8.12-1.1, …), 164 product×package rows across 29 product lines (SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS, SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS, … (29 product lines)): Known Not Affected 154, Fixed 10. https://www.suse.com/security/cve/CVE-2026-1584/
ubuntu high CVE-2026-1584 high priority: Ubuntu including 1 source packages (gnutls28), 7 status rows across 7 suites (bionic, focal, jammy, noble, questing, upstream, xenial): not-affected 6, released 1. https://ubuntu.com/security/CVE-2026-1584

Affected software / configurations for CVE-2026-1584

Vendor Product Version Raw CPE
gnu gnutls — cpe:2.3:a:gnu:gnutls:-:*:*:*:*:*:*:*
redhat hardened_images — cpe:2.3:a:redhat:hardened_images:-:*:*:*:*:*:*:*

References for CVE-2026-1584

cvelogic Threat Intelligence