CVE-2021-25900: Buffer overflow in SmallVec::insert_many

CVE-2021-25900 PUBLISHED CVSS 9.800000190734863 CRITICAL

Buffer overflow in SmallVec::insert_many

Reported by mitre · Published January 22, 2021

An issue was discovered in the smallvec crate before 0.6.14 and 1.x before 1.6.1 for Rust. There is a heap-based buffer overflow in SmallVec::insert_many.

Risk scores

CVSS 3.1

9.800000190734863

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Vendor	Product	Versions
n/a	n/a	n/a
n/a	n/a	*
crates.io	smallvec	0.6.3, 1.0.0

Timeline

Jan 22, 2021 CVE Published
Apr 14, 2021 EPSS Score (30 in total, the first dated here)
Jun 13, 2023 CVE Updated
Mar 17, 2026 Security Advisory (2 in total, the first dated here)
Aug 8, 2026 Coalition ESS Score

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