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.
Published: 2026-05-26
Score: 7.3 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-97wc-2hqc-cjgr smallbitvec: Integer overflow in safe API leads to heap buffer overflow
History

Wed, 27 May 2026 13:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 27 May 2026 09:30:00 +0000

Type Values Removed Values Added
First Time appeared Servo
Servo smallvec
Vendors & Products Servo
Servo smallvec

Tue, 26 May 2026 21:45:00 +0000

Type Values Removed Values Added
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.
Title smallbitvec: Safe API Triggered Heap Buffer Overflow via Integer Overflow
Weaknesses CWE-122
CWE-190
References
Metrics cvssV3_1

{'score': 7.3, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-05-27T12:45:15.497Z

Reserved: 2026-05-08T16:23:33.264Z

Link: CVE-2026-44983

cve-icon Vulnrichment

Updated: 2026-05-27T12:44:58.323Z

cve-icon NVD

Status : Deferred

Published: 2026-05-26T22:16:43.440

Modified: 2026-06-17T10:51:33.440

Link: CVE-2026-44983

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-27T09:15:29Z

Weaknesses