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Vulnerability record · CVE-2026-44983 · published 26 May 2026

CVE-2026-44983: Heap-based buffer overflow vulnerability

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.

7.3 CVSS 3.1 High EPSS 0.16% · top 95.8% CWE-122 · Heap-based buffer overflowCWE-190 · Integer overflow Deferred
7.3CVSS 3.1 base score
0.16%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
24 Jul 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

References

LinkTags
https://github.com/servo/smallbitvec/security/advisories/GHSA-97wc-2hqc-cjgr
https://github.com/servo/smallbitvec/security/advisories/GHSA-97wc-2hqc-cjgr

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Source: NIST National Vulnerability Database (record CVE-2026-44983), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.