CVE-2026-44983

smallbitvec: Safe API Triggered Heap Buffer Overflow via Integer Overflow

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.

Affected

servo · smallbitvec

CVSS v3.1 GITHUB

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

EPSS

0.16% chance of exploitation in the next 30 days, 5th percentile

Published

2026-05-26

Updated

2026-05-27

Proof-of-concept exploits (1)

• advisories/GHSA-97wc-2hqc-cjgr

References

• CVE Record
• NVD entry