Cyber Resilience

CVE-2026-42010

Redhat Enterprise Linux 10.0 … 9.0

Published
07 May 2026
Modified
23 July 2026
Patch / advisory
View advisory
CVSS Score v3.1 7.1
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
EPSS Score 0.011 61th percentile
Risk Priority 56 floored blend · peak EPSS

Summary

CVE-2026-42010 is a high-severity Improper Null Termination (CWE-170) vulnerability in Redhat Enterprise Linux. Its CVSS base score is 7.1 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked in the top 39% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to SA-11 (Developer Testing and Evaluation) and SI-10 (Information Input Validation) — see the control section below for these in your framework.

EU & UK References

Vulnerability Data

A flaw was found in gnutls. Servers configured with RSA-PSK (Rivest–Shamir–Adleman – Pre-Shared Key) wrongfully matched usernames containing a NUL character with truncated usernames. A remote attacker could exploit this by sending a specially crafted username, leading to an authentication…

more

bypass. This vulnerability allows an attacker to gain unauthorized access by circumventing the authentication process.

CWE(s)
CWE-170CWE-626

Related Threats

MITRE ATT&CK Enterprise Techniques

T1068 Exploitation for Privilege Escalation Privilege Escalation
Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.
attack.mitre.org →
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 →
T1203 Exploitation for Client Execution Execution
Adversaries may exploit software vulnerabilities in client applications to execute code.
attack.mitre.org →
T1210 Exploitation of Remote Services Lateral Movement
Adversaries may exploit remote services to gain unauthorized access to internal systems once inside of a network.
attack.mitre.org →
T1212 Exploitation for Credential Access Credential Access
Adversaries may exploit software vulnerabilities in an attempt to collect credentials.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2026-33845Same product: Gnu Gnutls
CVE-2025-32990Same product: Gnu Gnutls
CVE-2026-3832Same product: Gnu Gnutls
CVE-2026-6846Same product: Redhat Enterprise Linux
CVE-2025-32988Same product: Gnu Gnutls
CVE-2026-3833Same product: Gnu Gnutls
CVE-2026-4647Same product: Redhat Enterprise Linux
CVE-2026-3442Same product: Redhat Enterprise Linux
CVE-2026-3441Same product: Redhat Enterprise Linux
CVE-2024-45778Same product: Redhat Enterprise Linux

Affected Assets

gnu
gnutls
all versions
redhat
hardened images
all versions
redhat
openshift container platform
4.0
redhat
enterprise linux
10.0, 6.0, 7.0, 8.0, 9.0

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SA-11 Developer Testing and Evaluation good match

Developer testing and evaluation can discover missing or incorrect string termination during code review or dynamic analysis.

SI-10 Information Input Validation good match

Input validation directly stops malformed null bytes from being accepted or mishandled when data crosses representation or component boundaries.

SA-15 Development Process, Standards, and Tools partial match

Requiring documented development standards and tools can enforce safe string-handling practices that produce correct null termination.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices directly enforce correct string/array termination via coding standards, reviews, and static analysis.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing in development can detect missing or incorrect null terminators before release.

A.8.25 Secure development life cycle partial match
prevents

Secure SDLC mandates input validation and string handling rules that prevent missing null terminators.

A.8.26 Application security requirements partial match
prevents

Application security requirements can explicitly call for proper string termination and buffer handling.

A.8.27 Secure system architecture and engineering principles partial match
degrades

Secure architecture principles include defensive coding practices that address buffer and string termination issues.

A.8.28 Secure coding partial match
prevents

Secure coding standards directly require correct null termination of strings and arrays.

References