Cyber Resilience

CVE-2026-5260

HighUpdated

Published: 26 May 2026

Published
26 May 2026
Modified
30 June 2026
KEV Added
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Patch
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CVSS Score v3.1 8.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
EPSS Score 0.0073 49.6th percentile
Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-5260 is a high-severity Buffer Over-read (CWE-126) vulnerability in Gnutls (inferred from references). Its CVSS base score is 8.2 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 49.6th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

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…

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memory corruption vulnerability could lead to information disclosure.

CWE(s)
CWE-126

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
Why these techniques?

Remote heap overread in libgnutls TLS RSA key exchange enables direct exploitation of a public-facing server for information disclosure.

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

CVE-2026-34059Shared CWE-126
CVE-2026-24028Shared CWE-126
CVE-2024-12011Shared CWE-126
CVE-2025-21277Shared CWE-126
CVE-2024-49839Shared CWE-126
CVE-2026-41898Shared CWE-126
CVE-2025-21427Shared CWE-126
CVE-2024-49838Shared CWE-126
CVE-2025-12106Shared CWE-126
CVE-2026-20846Shared CWE-126

Affected Assets

Gnutls
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inferred from references and description; NVD did not file a CPE for this CVE

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References