CVE-2020-28270: Prototype pollution vulnerability in 'object-hierarchy-access' versions 0.2.0 through 0.32.0 allows attacker t

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CRITICAL 9.8REMOTEUPGRADE

CVE-2020-28270 is a critical-severity flaw (CVSS 9.8) affecting object-hierarchy-access. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Prototype pollution vulnerability in 'object-hierarchy-access' versions 0.2.0 through 0.32.0 allows attacker to cause a denial of service and may lead to remote code execution.

Why this priority

Critical severity
EPSS top 10%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	3.8% (top 10%)
CISA exploited list	No
Weakness	CWE-1321
Published	2020-11-12
Last modified	2026-06-17

Publisher (CNA): Mend · Vendor: mjpclab

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

Am I affected?

Timeline

2020-11-12 18:15 UTCPublished CVE record published
2026-06-17 03:10 UTCUpdated Record last modified

mjpclab object-hierarchy-access UPGRADE

Affected: >= 0.2.0 and <= 0.32.0

Fixed in: newer than 0.32.0

Safe to downgrade to: a release before 0.2.0

1. Check installed version

apt-cache policy object-hierarchy-access || rpm -q object-hierarchy-access || object-hierarchy-access --version

2. UPGRADE to newer than 0.32.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade object-hierarchy-access

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade object-hierarchy-access

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 0.2.0 (Debian / Ubuntu)

apt-cache madison object-hierarchy-access sudo apt install object-hierarchy-access=<VERSION_BEFORE_0.2.0> sudo apt-mark hold object-hierarchy-access

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list object-hierarchy-access sudo dnf downgrade object-hierarchy-access-<VERSION_BEFORE_0.2.0> sudo dnf versionlock add object-hierarchy-access

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-2020-28270?

object-hierarchy-access: upgrade to newer than 0.32.0. Exact commands for each OS are on this page.

Is CVE-2020-28270 being exploited?

CVE-2020-28270 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-2020-28270 affect?

CVE-2020-28270 affects object-hierarchy-access. Severity is critical (CVSS 9.8). Prototype pollution vulnerability in 'object-hierarchy-access' versions 0.2.0 through 0.32.0 allows attacker to cause a denial of service and may lead to remote code execution.

How urgent is CVE-2020-28270?

Priority 67/100. Critical severity; EPSS top 10%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

References

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