CVE-2026-44983

HIGH

smallbitvec: Safe API Triggered Heap Buffer Overflow via Integer Overflow

Title source: cna
STIX 2.1

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.

References (1)

Core 1
Core References

Scores

CVSS v3 7.3
EPSS 0.0015
EPSS Percentile 4.6%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact partial

Details

CWE
CWE-122 CWE-190
Status published
Products (2)
crates.io/smallbitvec 1.0.1 - 2.6.0crates.io
servo/smallbitvec >= 1.0.1, < 2.6.1
Published May 26, 2026
Tracked Since May 27, 2026