CVE-2026-44983 Details
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.
A heap buffer overflow vulnerability has been identified in the smallbitvec library for Rust, specifically in versions 1.0.1 prior to 2.6.0. The issue arises from an integer overflow in the internal capacity calculation, which can lead to an undersized heap allocation. This flaw allows for memory corruption through safe APIs, without the need for unsafe code from the caller. The vulnerability is rooted in unchecked arithmetic that can cause the allocation size to be significantly smaller than required, creating a mismatch between the logical and actual buffer sizes. Subsequent safe API calls can then manipulate this corrupted metadata, eventually accessing memory out-of-bounds and causing undefined behavior.
Users should upgrade to smallbitvec version 2.6.1 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed May 26, 2026CISA-ADP
Assessed May 27, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/servo/smallbitvec/security/advisories/GHSA-97wc-2hqc-cjgr | CISA-ADP | AdvisoryExploitRemedyVendor |
| https://github.com/servo/smallbitvec/security/advisories/GHSA-97wc-2hqc-cjgr | [email protected] | AdvisoryExploitRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-122 | Heap-based Buffer Overflow | [email protected] |
| CWE-190 | Integer Overflow or Wraparound | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| smallbitvec | >= 1.0.1, <= 2.6.0 (semver) |
CPE
Remediation
| |
Change History
6 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 24, 2026 | CVE Translated | [email protected] |
| Jul 23, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 27, 2026 | CVE Modified | CISA-ADP |
| May 26, 2026 | New CVE Received | [email protected] |