Cyber Resilience

CVE-2026-50103

Published
23 July 2026
Modified
30 July 2026
CVSS Score v4 7.1
Click a component to see what it means
Raw vectorCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS Score 0.0016 6th percentile
Risk Priority 34 floored blend · peak EPSS

Summary

CVE-2026-50103 is a high-severity Improper Handling of Syntactically Invalid Structure (CWE-228) vulnerability in Cisa (inferred from references). Its CVSS base score is 7.1 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 6th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

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

EU & UK References

Vulnerability Data

A NULL pointer dereference in the L2 GOOSE and R-GOOSE shared parser, which may allow a network-adjacent attacker to crash a subscribing application by sending a crafted GOOSE frame containing a malformed TLV value.

CWE(s)
CWE-228

Related Threats

MITRE ATT&CK Enterprise Techniques

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 →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2024-22809Shared CWE-228
CVE-2025-2529Shared CWE-228
CVE-2026-42100Shared CWE-228
CVE-2024-21612Shared CWE-228
CVE-2024-55594Shared CWE-228
CVE-2024-6382Shared CWE-228
CVE-2026-25657Shared CWE-228
CVE-2026-20125Shared CWE-228
CVE-2024-53828Shared CWE-228
CVE-2025-59174Shared CWE-228

Affected Assets

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

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SI-10 Information Input Validation good match

SI-10 requires validity checks on information inputs, directly stopping syntactically malformed data from being processed without proper handling.

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 require robust input validation and syntax handling to prevent malformed-structure flaws.

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 can detect malformed-input issues but does not itself implement the handling logic.

A.8.25 Secure development life cycle partial match
prevents

Secure development life cycle mandates input validation and error handling that directly prevents improper handling of syntactically invalid structures.

A.8.26 Application security requirements partial match
prevents

Application security requirements include explicit rules for input validation and malformed-data handling.

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

Secure system architecture principles encourage robust input handling but do not prescribe the specific coding practice.

A.8.28 Secure coding partial match
prevents

Secure coding explicitly requires validation of all input syntax and structure, directly eliminating CWE-228.

References