CVE-2020-28589: An improper array index validation vulnerability exists in the LoadObj functionality of tinyobjloader v2.0-rc1

This month

HIGH 8.8DOWNGRADE

CVE-2020-28589 is a high-severity flaw (CVSS 8.8) affecting tinyobjloader. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An improper array index validation vulnerability exists in the LoadObj functionality of tinyobjloader v2.0-rc1 and tinyobjloader development commit 79d4421. A specially crafted file could lead to code execution. An attacker can provide a malicious file to trigger this vulnerability.

Why this priority

High severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.9% (top 21%)
CISA exploited list	No
Weakness	CWE-129
Published	2021-08-11
Last modified	2026-06-17

Publisher (CNA): Talos · Vendor: tinyobjloader project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-08-11 13:15 UTCPublished CVE record published
2026-06-17 03:10 UTCUpdated Record last modified

tinyobjloader project tinyobjloader DOWNGRADE

Affected: 2.0 rc1

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0

1. Check installed version

apt-cache policy tinyobjloader || rpm -q tinyobjloader || tinyobjloader --version

2. No fixed release: DOWNGRADE to a release before 2.0 (Debian / Ubuntu)

apt-cache madison tinyobjloader sudo apt install tinyobjloader=<VERSION_BEFORE_2.0> sudo apt-mark hold tinyobjloader

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list tinyobjloader sudo dnf downgrade tinyobjloader-<VERSION_BEFORE_2.0> sudo dnf versionlock add tinyobjloader

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-28589?

tinyobjloader: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-28589 being exploited?

CVE-2020-28589 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-28589 affect?

CVE-2020-28589 affects tinyobjloader. Severity is high (CVSS 8.8). An improper array index validation vulnerability exists in the LoadObj functionality of tinyobjloader v2.0-rc1 and tinyobjloader development commit 79d4421. A specially crafted file could lead to code execution. An attacker can provide a ma

How urgent is CVE-2020-28589?

Priority 56/100. High severity; Public exploit reference

References

← Back to latest CVEs