CVE-2022-31139: UnsafeAccessor (UA) is a bridge to access jdk.internal.misc.Unsafe & sun.misc.Unsafe

This month

MEDIUM 5.9REMOTEUPGRADE

CVE-2022-31139 is a medium-severity flaw (CVSS 5.9) affecting unsafe accessor. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

UnsafeAccessor (UA) is a bridge to access jdk.internal.misc.Unsafe & sun.misc.Unsafe. Normally, if UA is loaded as a named module, the internal data of UA is protected by JVM and others can only access UA via UA's standard API. The main application can set up `SecurityCheck.AccessLimiter` for UA to limit access to UA. Starting with version 1.4.0 and prior to version 1.7.0, when `SecurityCheck.AccessLimiter` is set up, untrusted code can access UA

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.9 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	1.2% (top 33%)
CISA exploited list	No
Weakness	CWE-200, CWE-863
Published	2022-07-11
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: unsafe accessor project

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

Am I affected?

Timeline

2022-07-11 19:15 UTCPublished CVE record published
2026-06-17 04:44 UTCUpdated Record last modified

unsafe accessor project unsafe accessor UPGRADE

Affected: >= 1.4.0 and < 1.7.0

Fixed in: 1.7.0

Safe to downgrade to: a release before 1.4.0

1. Check installed version

apt-cache policy unsafe-accessor || rpm -q unsafe-accessor || unsafe-accessor --version

2. UPGRADE to 1.7.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade unsafe-accessor

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade unsafe-accessor

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 1.4.0 (Debian / Ubuntu)

apt-cache madison unsafe-accessor sudo apt install unsafe-accessor=<VERSION_BEFORE_1.4.0> sudo apt-mark hold unsafe-accessor

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

dnf --showduplicates list unsafe-accessor sudo dnf downgrade unsafe-accessor-<VERSION_BEFORE_1.4.0> sudo dnf versionlock add unsafe-accessor

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-2022-31139?

unsafe accessor: upgrade to 1.7.0. Exact commands for each OS are on this page.

Is CVE-2022-31139 being exploited?

CVE-2022-31139 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-2022-31139 affect?

CVE-2022-31139 affects unsafe accessor. Severity is medium (CVSS 5.9). UnsafeAccessor (UA) is a bridge to access jdk.internal.misc.Unsafe & sun.misc.Unsafe. Normally, if UA is loaded as a named module, the internal data of UA is protected by JVM and others can only access UA via UA's standard API. The main app

How urgent is CVE-2022-31139?

Priority 43/100. Remotely exploitable, no login, no user action

References

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