TI-2021-07911 Aliases CVE-2021-25900 GHSA-43w2-9j62-hq99

An issue was discovered in the smallvec crate before 0.6.14 and 1.x before 1.6.1 for Rust.

MEDIUM 45CWE-787Published 2021-01-22 · Updated 2024-08-03

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-787 and the CVSS impact.

Summary

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.

Why it matters now

EPSS 0.0172 77th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed smallvec (crates.io): 0.6.14, 1.6.1

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA
—	smallvec (crates.io)	0.6.3 to before 0.6.14	0.6.14	Patch available	GHSA-43w2-9j62-hq99
—	smallvec (crates.io)	1.0.0 to before 1.6.1	1.6.1	Patch available	GHSA-43w2-9j62-hq99

— Vendor— Affected all versions Fixed in — No fix listed CNA
smallvec (crates.io) Vendor— Affected 0.6.3 to before 0.6.14 Fixed in 0.6.14 Patch available GHSA-43w2-9j62-hq99
smallvec (crates.io) Vendor— Affected 1.0.0 to before 1.6.1 Fixed in 1.6.1 Patch available GHSA-43w2-9j62-hq99

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:servo:smallvec::::::rust::*	0.6.3 to before 0.6.14; 1.0.0 to before 1.6.1	Vulnerable	servo

cpe:2.3:a:servo:smallvec:*:*:*:*:*:rust:*:* Versions 0.6.3 to before 0.6.14; 1.0.0 to before 1.6.1 Vulnerable ·servo

Remediation

Fix · GHSA-43w2-9j62-hq99 smallvec (crates.io) Fixed in 0.6.14 Advisory →
Fix · GHSA-43w2-9j62-hq99 smallvec (crates.io) Fixed in 1.6.1 Advisory →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product

Red Hat

Timeline

2026-10-02 Threatist record created from CVE-2021-25900
2026-10-03 Alias added: GHSA-43w2-9j62-hq99

References

Exploit 1

https://rustsec.org/advisories/RUSTSEC-2021-0003.html

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2021-25900

Other 4

TI-2019-11654 An issue was discovered in the smallvec crate before 0.6.10 for Rust. CVSS 3.0CRITICAL 9.8
TI-2019-11651 An issue was discovered in the smallvec crate before 0.6.10 for Rust. CVSS 3.0CRITICAL 9.8
TI-2018-14953 An issue was discovered in the smallvec crate before 0.6.3 for Rust. CVSS 3.0CRITICAL 9.8
TI-2018-15250 An issue was discovered in the smallvec crate before 0.6.13 for Rust. CVSS 3.1HIGH 7.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences