Buffer overflow in Servo Smallbitvec
CVE-2026-44983
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…
Vulnerability class: Buffer Overflow
EPSS: 0.000 (0.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H.
Affected products
- Servo Smallbitvec — versions >= 1.0.1, < 2.6.1
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
Frequently asked questions
- What is CVE-2026-44983?
- CVE-2026-44983 is a high-severity vulnerability in Servo Smallbitvec, classified under Heap-based Buffer Overflow. CVSS score: 7.3/10. Published 2026-05-26.
- How severe is CVE-2026-44983?
- High severity. CVSS v3 base score is 7.3 out of 10.