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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-5260
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-26 22:16:44 UTC
Updated2026-07-23 11:10:00 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v3.1 8.2 HIGH from [email protected]

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

EPSS: 0.007270000 probability, percentile 0.503230000 (date 2026-07-22)

Problem Types: CWE-126 | CWE-126 Buffer Over-read

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.2HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
3.1CNACVSS8.2HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Red Hat Red Hat Enterprise Linux 10 unaffected 0:3.8.10-4.el10_2 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support unaffected 0:3.8.9-9.el10_0.19 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8 unaffected 0:3.6.16-8.el8_10.6 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8 unaffected 0:3.6.16-8.el8_10.6 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support unaffected 0:3.6.14-10.el8_4.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support unaffected 0:4.13-3.el8_4.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On unaffected 0:3.6.14-10.el8_4.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On unaffected 0:4.13-3.el8_4.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support unaffected 0:3.6.16-5.el8_6.5 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support unaffected 0:4.13-3.el8_6.2 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On unaffected 0:3.6.16-5.el8_6.5 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On unaffected 0:4.13-3.el8_6.2 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service unaffected 0:3.6.16-7.el8_8.4 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service unaffected 0:4.13-4.el8_8.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.8 Update Services For SAP Solutions unaffected 0:3.6.16-7.el8_8.4 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.8 Update Services For SAP Solutions unaffected 0:4.13-4.el8_8.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9 unaffected 0:3.8.10-4.el9_8 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9 unaffected 0:3.8.10-4.el9_8 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.2 Update Services For SAP Solutions unaffected 0:3.7.6-21.el9_2.7 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.4 Update Services For SAP Solutions unaffected 0:3.8.3-4.el9_4.6 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support unaffected 0:3.8.3-6.el9_6.4 * rpm Not specified
CNA Red Hat Red Hat OpenShift Container Platform 4.19 unaffected 4.19.9.6.202607151909-0 * rpm Not specified
CNA Red Hat Red Hat Discovery 2 unaffected 1782159791 * rpm Not specified
CNA Red Hat Red Hat Discovery 2 unaffected 1782166952 * rpm Not specified
CNA Red Hat Red Hat Hardened Images unaffected 3.8.13-1.hum1 * rpm Not specified
CNA Red Hat Red Hat Update Infrastructure 5 unaffected 1781525684 * rpm Not specified
CNA Red Hat Red Hat Update Infrastructure 5 unaffected 1781525671 * rpm Not specified
CNA Red Hat Red Hat Update Infrastructure 5 unaffected 1781525693 * rpm Not specified
CNA Red Hat Red Hat Update Infrastructure 5 unaffected 1781525739 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 6 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 7 Not specified Not specified
CNA Red Hat Red Hat OpenShift Container Platform 4 Not specified Not specified

References

ReferenceSourceLinkTags
access.redhat.com/errata/RHSA-2026:29197 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:41921 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:13274 [email protected] access.redhat.com
access.redhat.com/security/cve/CVE-2026-5260 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:30004 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:33125 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:26319 [email protected] access.redhat.com
bugzilla.redhat.com/show_bug.cgi [email protected] bugzilla.redhat.com
access.redhat.com/errata/RHSA-2026:32962 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:26409 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:30850 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:20612 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:40762 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:20613 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:30849 [email protected] access.redhat.com
www.gnutls.org/security-new.html [email protected] www.gnutls.org
access.redhat.com/errata/RHSA-2026:20611 [email protected] access.redhat.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Red Hat would like to thank Joshua Rogers (AISLE Research Team) for reporting this issue. (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-05-06T19:50:31.302ZReported to Red Hat.
CNA2026-04-29T00:00:00.000ZMade public.

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