CVE-2026-44983

High

Published: 26 May 2026

Published

26 May 2026

Modified

01 June 2026

KEV Added

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Patch

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CVSS Score v3.1 7.3 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

EPSS Score 0.0015 4.6th percentile

Risk Priority 15 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-44983 is a high-severity Heap-based Buffer Overflow (CWE-122) vulnerability. Its CVSS base score is 7.3 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 4.6th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2026-32015

Vulnerability details

smallbitvec is a growable bit-vector for Rust, optimized for size. From 1.0.1 to 2.6.0, an integer overflow in the internal capacity calculation of smallbitvec can lead to an undersized heap allocation, resulting in a heap buffer overflow through safe APIs…

only. This allows memory corruption without requiring unsafe code from the caller. This vulnerability is fixed in 2.6.1.

CWE(s): CWE-122 CWE-190

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 →

T1203 Exploitation for Client Execution Execution

Adversaries may exploit software vulnerabilities in client applications to execute code.

attack.mitre.org →

Why these techniques?

Heap buffer overflow via integer overflow enables remote exploitation of public apps or client-side code execution through crafted input to the library.

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