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Fencer Vulns
high 7.5

CVE-2026-1584 json

Gnutls: gnutls: remote denial of service via crafted clienthello with invalid psk binder

published 2026-04-09 7 mo ago modified 2026-11-04 4 d ago also EUVD-2026-20986

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 72%
public exploits
0
none known

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.

Patch / fix

  • Red Hat Red Hat Hardened Images 3.8.12-1.1.hum1
  • gnutls28 Debian 14 3.8.12-1

debian advisories DEBIAN-CVE-2026-1584

  • gnutls hummingbird 1 3.8.12-1.1.hum1
  • gnutls-c++ hummingbird 1 3.8.12-1.1.hum1
  • gnutls-dane hummingbird 1 3.8.12-1.1.hum1
  • gnutls-fips hummingbird 1 3.8.12-1.1.hum1
  • gnutls-utils hummingbird 1 3.8.12-1.1.hum1
  • mingw32-gnutls hummingbird 1 3.8.12-1.1.hum1
  • mingw64-gnutls hummingbird 1 3.8.12-1.1.hum1

red hat advisories RHSA-2026:7477

  • gnutls openSUSE Tumbleweed 3.8.12-1.1

opensuse advisories openSUSE-SU-2026:10177-1

  • gnutls Alpine 3.24, Alpine 3.23, Alpine 3.22 +2 more 3.8.12-r0

alpine advisories ALPINE-CVE-2026-1584

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-1584 updated cvss 7.5

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

  • Red Hat Hardened Images gnutls 3.8.12-1.1.hum1, gnutls-c++ 3.8.12-1.1.hum1, gnutls-dane 3.8.12-1.1.hum1, gnutls-fips 3.8.12-1.1.hum1, gnutls-utils 3.8.12-1.1.hum1, mingw32-gnutls 3.8.12-1.1.hum1, +1 more
    fixed: vendor fix RHSA-2026:7477
  • Red Hat Enterprise Linux 6 gnutls, gnutls-guile, gnutls-utils Red Hat Enterprise Linux 7 gnutls, gnutls-c++, gnutls-dane, gnutls-utils Red Hat Enterprise Linux 8 gnutls, gnutls-c++, gnutls-dane, gnutls-utils Red Hat Enterprise Linux 9 gnutls, gnutls-c++, gnutls-dane, gnutls-utils Red Hat Enterprise Linux 10 gnutls Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
6 mo ago

Exploit prediction

1.37% chance of exploitation in the next 30 days, higher than 72% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Red Hat Red Hat Hardened Images
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat OpenShift Container Platform 4

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.