CVE-2026-44983

smallbitvec: Safe API Triggered Heap Buffer Overflow via Integer Overflow

State: Published
Severity: 7.3 High
Published: May 26, 2026
Updated: May 27, 2026
Reserved: May 8, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.3 High	CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H	GitHub_M

Weaknesses

CWE-122 Heap-based Buffer Overflow
CWE-190 Integer Overflow or Wraparound

Affected Products

Product	Versions
smallbitvecservo	>= 1.0.1, < 2.6.1Affected

References

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

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