CVE-2022-31139Network attack vector

Unauthorized JVM Unsafe access via omitted limiter callback

Published Jul 11, 2022 · Updated Apr 23, 2025

Incorrect authorization in Karlatemp Unsafe Accessor 1.4.0 through 1.6.2 allows attackers to obtain unrestricted JVM Unsafe access. UnsafeAccess.getInstance() returns the singleton after calling SecurityCheck.getInstance(), but fails to retrieve the configured limiter and invoke preGetUnsafeAccess() before returning. Exploitation requires an application to configure SecurityCheck.AccessLimiter and expose execution to untrusted code; successful access bypasses that policy and exposes JVM-internal memory operations.

CVSS severity5.9
Medium
EPSS probability1.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in Karlatemp Unsafe Accessor 1.4.0 through 1.6.2 allows attackers to obtain unrestricted JVM Unsafe access. UnsafeAccess.getInstance() returns the singleton after calling SecurityCheck.getInstance(), but fails to retrieve the configured limiter and invoke preGetUnsafeAccess() before returning. Exploitation requires an application to configure SecurityCheck.AccessLimiter and expose execution to untrusted code; successful access bypasses that policy and exposes JVM-internal memory operations.

The record

CVE
CVE-2022-31139
Published
Jul 11, 2022
Updated
Apr 23, 2025
Vendor
Karlatemp
Product
Unsafe Accessor
Classifications
CWE-863, CWE-200
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 11, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 1.4.0, < 1.7.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Karlatemp · Unsafe Accessorversion=>= 1.4.0, < 1.7.0

Published CVSS scores

4.3NISTAV:N/AC:M/Au:N/C:P/I:N/A:N
5.9GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
7.5NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-863Incorrect Authorization
CWE-200Exposure of Sensitive Information to an Unauthorized Actor

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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