Double Free in Servo Smallvec

CVE-2018-20991

An issue was discovered in the smallvec crate before 0.6.3 for Rust. The Iterator implementation mishandles destructors, leading to a double free.

Vulnerability class: Double Free

EPSS: 0.018 (76.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Servo Smallvec
N/a — versions n/a

Weakness classification (CWE)

CWE-415 — Double Free

Public proof-of-concept exploits

References

cve@mitre.org (Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2018-20991?: CVE-2018-20991 is a critical-severity vulnerability in Servo Smallvec, classified under Double Free. CVSS score: 9.8/10. Published 2019-08-26.
How severe is CVE-2018-20991?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2018-20991 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.