CVE-2026-55083Network attack vectorHinoki check available

Code execution via unfiltered user-setting deserialization

Published Oct 1, 2026 · Updated Oct 1, 2026

Unsafe Java deserialization in DHIS2 Core 2.42.0 through 2.42.5 and 2.43.0 allows remote authenticated users to execute code. HibernateUserSettingStore.fromBinary passes bytes from usersetting.value to ObjectInputStream.readObject without a class filter, permitting gadget classes on the classpath to run during deserialization. Exploitation requires high application privileges and suitable gadget classes; code executes in the server process.

CVSS severity9.1
Critical
EPSS probability0.57%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Unsafe Java deserialization in DHIS2 Core 2.42.0 through 2.42.5 and 2.43.0 allows remote authenticated users to execute code. HibernateUserSettingStore.fromBinary passes bytes from usersetting.value to ObjectInputStream.readObject without a class filter, permitting gadget classes on the classpath to run during deserialization. Exploitation requires high application privileges and suitable gadget classes; code executes in the server process.

The record

CVE
CVE-2026-55083
Published
Oct 1, 2026
Updated
Oct 1, 2026
Vendor
DHIS2
Product
DHIS2 Core
Classifications
CWE-502, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 1, 2026Record 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=>= 2.42.0, < 2.42.5.1
  2. Affected versionversion=>= 2.43.0, < 2.43.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

DHIS2 · DHIS2 Coreversion=>= 2.42.0, < 2.42.5.1; version=>= 2.43.0, < 2.43.0.1

Published CVSS scores

9.1GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1190Exploit Public-Facing Application

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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