Auth bypass in Fasterxml Jackson-Databind
CVE-2026-59889
jackson-databind contains the general-purpose data-binding functionality and tree-model for Jackson Data Processor. From 2.18.0 until 2.18.9, 2.21.5, 2.22.1, 3.1.5, and 3.2.1, UnwrappedPropertyHandler.processUnwrapped() replays buffered JSON for a @JsonUnwrapped property and calls prop.deserializeAndSet() without a prop.visibleInView(ctxt.getActiveView()) guard, allowing a property annotated with both @JsonView and @JsonUnwrapped to be written from attacker JSON under a less-privileged active view. This issue is fixed in versions 2.18.9, 2.21.5, 2.22.1, 3.1.5, and 3.2.1.
Vulnerability class: Broken Access Control
EPSS: 0.003 (27.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.
Affected products
- Fasterxml Jackson-databind — versions >= 2.18.0, < 2.18.9, >= 2.21.0, < 2.21.5, >= 2.22.0, < 2.22.1
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-59889?
- CVE-2026-59889 is a medium-severity vulnerability in Fasterxml Jackson-Databind, classified under Incorrect Authorization. CVSS score: 6.5/10. Published 2026-07-14.
- How severe is CVE-2026-59889?
- Medium severity. CVSS v3 base score is 6.5 out of 10.