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
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.003 (27.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 27.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.003 · change: -0.000
Affected products
- Fasterxml Jackson-Databind — versions >= 2.19.0, < 2.21.5, >= 2.0.0-RC1, < 2.18.9, >= 3.0.0, < 3.1.5
Weakness classification (CWE)
References
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.