Cyber Resilience

CVE-2026-42015

Medium

Published: 26 May 2026

Published
26 May 2026
Modified
02 June 2026
KEV Added
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Patch
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CVSS Score v3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
EPSS Score 0.0025 48.4th percentile
Risk Priority 11 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-42015 is a medium-severity Off-by-one Error (CWE-193) vulnerability. Its CVSS base score is 5.3 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 48.4th 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 gnutls. An off-by-one error exists in the PKCS#12 bag element bounds check. This vulnerability allows an remote attacker to write past the internal array of a PKCS#12 bag when appending to a bag that already…

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contains 32 elements. This memory corruption could lead to a denial of service (DoS) or potentially other unspecified impacts.

CWE(s)
CWE-193

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 memory corruption in crypto library enables exploitation of public-facing apps/services using GnuTLS for arbitrary impacts beyond DoS.

Confidence: MEDIUM · MITRE ATT&CK Enterprise v18.1

Affected Assets

Mitigating Controls

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

References