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CVE-2018-20991 — Double free in smallvec — CVE Details

CRITICAL

Double free in smallvec

Published August 25, 2021Updated November 8, 2023Source: osv

Summary

If an iterator passed to SmallVec::insert_many panicked in Iterator::next, destructors were run during unwinding while the vector was in an inconsistent state, possibly causing a double free (a destructor running on two copies of the same value). This is fixed in smallvec 0.6.3 by ensuring that the vector's length is not updated to include moved items until they have been removed from their original positions. Items may now be leaked if Iterator::next panics, but they will not be dropped more than once.

Advisory Timeline

  • First published August 25, 2021 (1874 days ago).
  • Last revised November 8, 2023 — 804 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Cargo
Update smallvec to 0.6.3 or later
cargo update -p smallvec --precise 0.6.3

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: crates.io (1).

PackageEcosystemAffectedFixed In
smallvec
crates.io
All versions0.6.3

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.8 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Frequently Asked Questions

What is CVE-2018-20991?
Double free in smallvec This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.8/10).
How do I check if my project is affected by CVE-2018-20991?
CVE-2018-20991 affects smallvec. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2018-20991 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.8

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-rxr4-x558-x7hw
RUSTSEC-2018-0003

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