Cyber Resilience

CVE-2026-4746

Critical

Published: 24 March 2026

Published
24 March 2026
Modified
24 March 2026
KEV Added
—
Patch
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CVSS Score v4 10.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:A/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:N/AU:Y/R:U/V:C/RE:L/U:Amber
EPSS Score 0.0028 19.2th percentile
Risk Priority 70 floored blend · peak EPSS

Summary

CVE-2026-4746 is a critical-severity Out-of-bounds Write (CWE-787) vulnerability. Its CVSS base score is 10.0 (Critical).

Operationally, ranked at the 19.2th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

Out-of-bounds Write vulnerability in timeplus-io proton (base/poco/Foundation/src‎ modules). This vulnerability is associated with program files inflate.C. This issue affects proton: before 1.6.16.

CWE(s)
CWE-787

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

Insufficient information to map techniques.
Confidence: LOW · MITRE ATT&CK Enterprise v19.0

Affected Assets

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SI-16 Memory Protection
addresses: CWE-787

Out-of-bounds writes that corrupt control flow or inject shellcode are rendered non-executable by the same memory protections.

References