What’s Vulnerable › Vulnerabilities

CVE-2021-29939

• Severity: high (CVSS 7.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-04-01 · updated 2026-06-17
• Weakness: CWE-787

Description

An issue was discovered in the stackvector crate through 2021-02-19 for Rust. There is an out-of-bounds write in StackVec::extend if size_hint provides certain anomalous data.

Affected products

• Stackvector Project Stackvector: before 1.0.9 — fixed in 1.0.9

How to fix

Upgrade to a fixed version: Stackvector Project Stackvector 1.0.9. Check the vendor advisory for mitigations.

References

• https://rustsec.org/advisories/RUSTSEC-2021-0048.html
• https://rustsec.org/advisories/RUSTSEC-2021-0048.html

Get alerted when CVE-2021-29939 or the next vulnerability affects your stack