CVE-2026-5260

HIGH

Gnutls: gnutls: information disclosure via heap overread in rsa key exchange

Title source: cna

Description

A flaw was found in libgnutls. A remote attacker, by sending an extremely short premaster secret during an RSA key exchange to a server using an RSA key backed by a PKCS#11 token, could trigger a short heap overread. This memory corruption vulnerability could lead to information disclosure.

References (17)

Core 17

Core References

Vendor Advisory vendor-advisory x_refsource_redhat

RHSA-2026:20612

https://access.redhat.com/errata/RHSA-2026:20612

Vendor Advisory vendor-advisory x_refsource_redhat

https://access.redhat.com/errata/RHSA-2026:20613

Vendor Advisory vendor-advisory x_refsource_redhat

RHSA-2026:29197

https://access.redhat.com/errata/RHSA-2026:29197

Vendor Advisory vendor-advisory x_refsource_redhat

RHSA-2026:30004

https://access.redhat.com/errata/RHSA-2026:30004

Vendor Advisory vendor-advisory x_refsource_redhat

RHSA-2026:33125

https://access.redhat.com/errata/RHSA-2026:33125

Vendor Advisory vendor-advisory x_refsource_redhat

RHSA-2026:26319

https://access.redhat.com/errata/RHSA-2026:26319

Vendor Advisory vendor-advisory x_refsource_redhat

RHSA-2026:26409

https://access.redhat.com/errata/RHSA-2026:26409

Vendor Advisory vendor-advisory x_refsource_redhat

RHSA-2026:20611

https://access.redhat.com/errata/RHSA-2026:20611

Vdb Entry, X_Refsource_Redhat vdb-entry x_refsource_redhat

https://access.redhat.com/security/cve/CVE-2026-5260

Vendor Advisory vendor-advisory x_refsource_redhat

RHSA-2026:13274

https://access.redhat.com/errata/RHSA-2026:13274

Issue Tracking, X_Refsource_Redhat issue-tracking x_refsource_redhat

RHBZ#2467450

https://bugzilla.redhat.com/show_bug.cgi?id=2467450

Vendor Advisory vendor-advisory x_refsource_redhat

RHSA-2026:30849

https://access.redhat.com/errata/RHSA-2026:30849

Vendor Advisory vendor-advisory x_refsource_redhat

RHSA-2026:30850

https://access.redhat.com/errata/RHSA-2026:30850

Vendor Advisory vendor-advisory x_refsource_redhat

RHSA-2026:32962

https://access.redhat.com/errata/RHSA-2026:32962

Vendor Advisory vendor-advisory x_refsource_redhat

RHSA-2026:41921

https://access.redhat.com/errata/RHSA-2026:41921

https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-10

Vendor Advisory vendor-advisory x_refsource_redhat

RHSA-2026:40762

https://access.redhat.com/errata/RHSA-2026:40762

Scores

CVSS v3 8.2

EPSS 0.0073

EPSS Percentile 50.5%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

CISA SSVC

Vulnrichment

Exploitation none

Automatable yes

Technical Impact partial

Details

CWE

CWE-126

Status published

Products (34)

Red Hat/Red Hat Discovery 2 1782159791

Red Hat/Red Hat Discovery 2 1782166952

Red Hat/Red Hat Enterprise Linux 10

Red Hat/Red Hat Enterprise Linux 10 0:3.8.10-4.el10_2

Red Hat/Red Hat Enterprise Linux 10.0 Extended Update Support 0:3.8.9-9.el10_0.19

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 8 0:3.6.16-8.el8_10.6

Red Hat/Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:3.6.14-10.el8_4.1

... and 24 more

Published May 26, 2026

Tracked Since May 27, 2026