9.8

CVE-2018-20991: servo smallvec Double Free

CVSS: 9.8v3.0CriticalModified
AliasesSUSE-SU-2021:1310-1UBUNTU-CVE-2018-20991GHSA-rxr4-x558-x7hw
Published 26-08-2019Last modified 05-08-2024
Open JSON

Vulnerability summary

CVE-2018-20991 is a critical (CVSS 9.8) Double Free vulnerability in servo smallvec. EPSS estimates a 1.85% chance of exploitation in the next 30 days, higher than 78.7% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.0 (NVD)
EPSS score
1.85%
0%100%
Low · +0.03 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 26-08-2019
    PublishedVulnerability first disclosed.
  2. 05-08-2024
    Last modifiedVulnerability information updated.

Description

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

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

1.85%

Chance of exploitation in the next 30 days

Percentile

79%

Versus all other CVEs

30-day change

+0.03 pp

From 1.81% on 20-09-2026

20-09-202620-10-2026
EPSS score
1.85%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Crates.Io1 product
  • smallvec≥ 0.3.2, < 0.6.3 | ≥ 0.6.0-0, < 0.6.3
Servo1 product
Suse1 product
  • librsvg&distro=SUSE Linux Enterprise Module for Package Hub 15 SP2< 2.42.9-3.6.1
Ubuntu1 product
  • rust-smallvecAll versions (No fix recorded)

4 vendors · 4 products

References

11 links
Show all 11 references