CVE-2026-54518 jackson-databind: @JsonView bypass for unwrapped creator parameters in jackson-databind
Attackers can bypass @JsonView restrictions to populate sensitive constructor parameters in jackson-databind via unwrapped properties.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-54518?
CVE-2026-54518 is a medium-severity vulnerability in Fasterxml Jackson-Databind, published on 23 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
jackson-databind contains the general-purpose data-binding functionality and tree-model for Jackson Data Processor. From 2.21.0 until 2.21.4 and 3.1.4, UnwrappedPropertyHandler.processUnwrappedCreatorProperties() replays buffered JSON into creator parameters but never consults prop.visibleInView(activeView). The normal property-based creator path gates creator properties on the active view, but this unwrapped-creator replay path bypasses that check, so a constructor parameter annotated with both @JsonView(AdminView.class) and @JsonUnwrapped is populated from attacker JSON even when a more restrictive view is active. This vulnerability is fixed in 2.21.4 and 3.1.4.
Weakness: CWE-863
Which versions are affected by CVE-2026-54518?
4 open source packages ship an affected version, including com.fasterxml.jackson.core:jackson-databind and tools.jackson.core:jackson-databind. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
com.fasterxml.jackson.core:jackson-databind Maven | From 2.21.0 | 2.21.4 |
com.fasterxml.jackson.core:jackson-databind Maven | From 2.21.0 | 2.21.4 |
tools.jackson.core:jackson-databind Maven | From 3.0.0 | 3.1.4 |
tools.jackson.core:jackson-databind Maven | From 3.0.0 | 3.1.4 |
Products include Fasterxml Jackson-Databind.
How do I fix CVE-2026-54518?
Upgrade com.fasterxml.jackson.core:jackson-databind to 2.21.4 or later.
Is CVE-2026-54518 being exploited?
There is no known exploitation of CVE-2026-54518 in the wild and no public exploit code.
Other vulnerabilities in Fasterxml Jackson-Databind
- CVE-2018-11307 Deserialization of Untrusted Data in jackson-databind
- CVE-2026-54512 jackson-databind: PolymorphicTypeValidator bypass via generic type parameters allows arbitrary class instantiation
- CVE-2026-54513 jackson-databind: Array subtype allowlist bypass in BasicPolymorphicTypeValidator (allowIfSubTypeIsArray)
- CVE-2020-14060 Deserialization of untrusted data in Jackson Databind
- CVE-2021-46877 jackson-databind possible Denial of Service if using JDK serialization to serialize JsonNode
Sources
Also known as CLEANSTART-2026-HS31999, CLEANSTART-2026-JT63457, CLEANSTART-2026-QG94789, CLEANSTART-2026-UL33959, CLEANSTART-2026-WQ14313, DEBIAN-CVE-2026-54518 and 43 more.