Cyber Resilience

CVE-2026-3199

CriticalRCE

Published: 08 April 2026

Published
08 April 2026
Modified
13 April 2026
KEV Added
—
Patch
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CVSS Score v4 9.4 CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS Score 0.0036 27.7th percentile
Risk Priority 70 floored blend · peak EPSS

Summary

CVE-2026-3199 is a critical-severity Deserialization of Untrusted Data (CWE-502) vulnerability in Sonatype Nexus Repository (inferred from references). Its CVSS base score is 9.4 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 27.7th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

OWASP Top 10 for Web (2025)

A08:2025 Software or Data Integrity Failures

EU & UK References

Vulnerability details

A vulnerability in the task management component of Sonatype Nexus Repository versions 3.22.1 through 3.90.2 allows an authenticated attacker with task creation permissions to execute arbitrary code, bypassing the nexus.scripts.allowCreation security control.

CWE(s)
CWE-502

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1059 Command and Scripting Interpreter Execution
Adversaries may abuse command and script interpreters to execute commands, scripts, or binaries.
attack.mitre.org →
Why these techniques?

Authenticated RCE via deserialization (CWE-502) in server task component directly enables T1190 (public app exploitation) and T1059 (arbitrary code/command execution), bypassing script controls.

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

Affected Assets

Sonatype
Nexus Repository
inferred from references and description; NVD did not file a CPE for this CVE

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

CA-8 Penetration Testing
addresses: CWE-502

Penetration testing supplies malicious serialized objects, detecting unsafe deserialization and supporting corrective actions.

SA-11 Developer Testing and Evaluation
addresses: CWE-502

Evaluation of untrusted data handling (deserialization testing) reveals unsafe processing, which the required remediation process addresses.

SC-44 Detonation Chambers
addresses: CWE-502

Untrusted serialized data can be deserialized and observed inside the chamber, blocking gadget-chain exploitation outside the sandbox.

SI-10 Information Input Validation
addresses: CWE-502

Validates or rejects untrusted serialized data before deserialization occurs.

SI-3 Malicious Code Protection
addresses: CWE-502

Identifies and blocks malicious code introduced through deserialization of untrusted data at system boundaries.

SI-7 Software, Firmware, and Information Integrity
addresses: CWE-502

Integrity verification of serialized information can detect tampering before deserialization occurs.

SR-4 Provenance
addresses: CWE-502

Provenance of associated data allows detection of untrusted sources before deserialization or processing occurs.

References