CVE-2026-54517 is a medium-severity (CVSS 5.3) CWE-863 vulnerability in com.fasterxml.jackson.core:jackson-databind. A fix is available for com.fasterxml.jackson.core:jackson-databind — see the affected versions and patch details below.
jackson-databind: @JsonView bypass for setterless creator properties
Exploitation Status
No confirmed exploitation observed yet
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2026-54517.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
CVE-2026-54517 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.
Where this sits among everything scored
Of 394,803 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.
Real-World Exposure
com.fasterxml.jackson.core:jackson-databind☕com.fasterxml.jackson.core:jackson-databind☕tools.jackson.core:jackson-databindReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.
Description
Summary
In BeanDeserializer._deserializeUsingPropertyBased, the active-view (@JsonView) filter was applied only to creator properties; the regular property-buffering branch performed no prop.visibleInView(activeView) check. A change making SetterlessProperty.isMerging() return true routed setterless Collection/Map properties through this unguarded path, so a setterless collection annotated with a restricted @JsonView is populated from attacker JSON even when the active view excludes it.
Impact
View-restricted (e.g. admin-only) setterless collection/map properties can be written from untrusted JSON despite @JsonView gating — an access-control / mass-assignment bypass. No RCE or DoS.
Affected / Patched (verified via git tag --contains)
- 2.21 line:
>= 2.21.0, < 2.21.4-> fixed in 2.21.4 (backport94c5d21, #5970) - 3.x line:
>= 3.0.0, < 3.1.4-> fixed in 3.1.4 (#5969,5bf23ed)
Severity / CWE
Maintainer: minor. Reporter: HIGH. CWE-863 (Incorrect Authorization); related CWE-1220.
Credits
Omkhar Arasaratnam (@omkhar) - finder.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| ☕Maven | com.fasterxml.jackson.core:jackson-databind | ≥ 2.21.0&&< 2.21.4 | 2.21.4com.fasterxml.jackson.core:jackson-databind:2.21.4 |
| ☕Maven | com.fasterxml.jackson.core:jackson-databind | ≥ 3.0.0&&< 3.1.4 | 3.1.4com.fasterxml.jackson.core:jackson-databind:3.1.4 |
| ☕Maven | tools.jackson.core:jackson-databind | ≥ 3.0.0&&< 3.1.4 | 3.1.4tools.jackson.core:jackson-databind:3.1.4 |
Affected Products
jackson-databindfasterxmlDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for com.fasterxml.jackson.core:jackson-databind, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update com.fasterxml.jackson.core:jackson-databind to 2.21.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-54517 is resolved across your whole dependency graph.
Workarounds
Do not deserialise data from untrusted sources: where the format allows it, restrict deserialisation to an explicit allowlist of expected types, and prefer a data-only format (JSON, Protobuf) over one that can reconstruct arbitrary objects until you can upgrade.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
Moderate: A flaw in jackson-databind allows for information disclosure and an access-control bypass. This occurs because the `@JsonView` filter, intended to restrict data visibility, is not correctly applied to setterless collection and map properties during deserialization. An attacker could exploit this to populate…
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.Source: Red Hat security advisory for CVE-2026-54517 (CC BY 4.0)
| Product | Fixed in | Advisory |
|---|---|---|
| Red Hat build of Quarkus 3.27.4.SP2 | com.fasterxml.jackson.core/jackson-databind:2.21.4.redhat-00002 | RHSA-2026:36002 |
| Red Hat build of Quarkus 3.33.2.SP2 | com.fasterxml.jackson.core/jackson-databind:2.21.4.redhat-00002 | RHSA-2026:36013 |
Frequently Asked Questions
Is CVE-2026-54517 in your dependencies?
Find it across Maven, including transitive dependencies.