CVE-2026-44983 smallbitvec: Safe API Triggered Heap Buffer Overflow via Integer Overflow
An integer overflow in smallbitvec causes heap buffer overflows via safe APIs, potentially allowing memory corruption or crashes.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-44983?
CVE-2026-44983 is a high-severity vulnerability in servo smallbitvec, published on 26 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-44983?
2 open source packages ship an affected version, including smallbitvec.
| Package | Affected | Fixed in |
|---|---|---|
smallbitvec crates.io | From 1.0.1 to 2.6.0 | None |
smallbitvec crates.io | From 1.0.1 to 2.6.0 | None |
How do I fix CVE-2026-44983?
Upgrade to a fixed version.
Is CVE-2026-44983 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-44983 exists.
Sources
Also known as DEBIAN-CVE-2026-44983, GHSA-97wc-2hqc-cjgr, UBUNTU-CVE-2026-44983.