CVE-2020-18428: tinyexr commit 0.9.5 was discovered to contain an array index error in the tinyexr::SaveEXR component, which c

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HIGH 7.5REMOTEDOWNGRADE

CVE-2020-18428 is a high-severity flaw (CVSS 7.5) affecting tinyexr. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

tinyexr commit 0.9.5 was discovered to contain an array index error in the tinyexr::SaveEXR component, which can lead to a denial of service (DOS).

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.2% (top 31%)
CISA exploited list	No
Weakness	CWE-129
Published	2021-07-26
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: tinyexr project

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

Am I affected?

Timeline

2021-07-26 22:15 UTCPublished CVE record published
2026-06-17 02:59 UTCUpdated Record last modified

tinyexr project tinyexr DOWNGRADE

Affected: 0.9.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.9.5

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.9.5 (Debian / Ubuntu)

apt-cache madison tinyexr sudo apt install tinyexr=<VERSION_BEFORE_0.9.5> sudo apt-mark hold tinyexr

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

dnf --showduplicates list tinyexr sudo dnf downgrade tinyexr-<VERSION_BEFORE_0.9.5> sudo dnf versionlock add tinyexr

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-2020-18428?

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

Is CVE-2020-18428 being exploited?

CVE-2020-18428 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-2020-18428 affect?

CVE-2020-18428 affects tinyexr. Severity is high (CVSS 7.5). tinyexr commit 0.9.5 was discovered to contain an array index error in the tinyexr::SaveEXR component, which can lead to a denial of service (DOS).

How urgent is CVE-2020-18428?

Priority 53/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2022-38529 HIGH 7.8 DOWNGRADE tinyexr commit 0647fb3 was discovered to contain a heap-buffer overflow via the component rleUncompress.
CVE-2022-34300 HIGH 8.8 DOWNGRADE In tinyexr 1.0.1, there is a heap-based buffer over-read in tinyexr::DecodePixelData.
CVE-2020-19490 MEDIUM 5.5 DOWNGRADE tinyexr 0.9.5 has a integer overflow over-write in tinyexr::DecodePixelData in tinyexr.h, related to OpenEXR c
CVE-2020-18430 HIGH 7.5 DOWNGRADE tinyexr 0.9.5 was discovered to contain an array index error in the tinyexr::DecodeEXRImage component, which c

References

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