# 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. - **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 23 Jun 2026 - **Updated:** 24 Jun 2026 - **Also known as:** CLEANSTART-2026-HS31999, CLEANSTART-2026-JT63457, CLEANSTART-2026-QG94789, CLEANSTART-2026-UL33959, CLEANSTART-2026-WQ14313, DEBIAN-CVE-2026-54518, ECHO-f6c5-0428-3623, GHSA-rcqc-6cw3-h962, MINI-3fvg-99x5-phrf, MINI-3gm6-j24j-87j3, MINI-3vx7-46ch-8g66, MINI-3xgv-368v-vffm, MINI-47h5-6q4r-pq2f, MINI-5g4w-3356-fqpw, MINI-5gw5-r4gq-mrv2, MINI-5j7g-mrq2-p2px, MINI-64fx-rcgm-2qvc, MINI-6xrv-7jj5-73m2, MINI-74hg-pgq8-76m6, MINI-7p72-4mmg-877f, MINI-8m7p-5jqr-r2fg, MINI-9g38-58w2-xw6v, MINI-9j29-hh86-v4hj, MINI-cg4r-44vq-87xv, MINI-frgv-h4j5-44ww, MINI-g7fg-793c-c4jj, MINI-hh23-88g6-h67p, MINI-hrwm-gwxj-v9f9, MINI-jg7f-f9fx-wjmg, MINI-jrgv-4853-gm7f, MINI-jx94-58gv-cwmx, MINI-mg3v-r97x-cq9q, MINI-phj6-gccw-p9m7, MINI-pqfg-3mwj-wv73, MINI-q492-47fq-gvfm, MINI-qcrq-439g-xvx7, MINI-qmqf-7m77-2393, MINI-r75q-6rhj-cr86, MINI-rg6g-rq22-xw3w, MINI-rvf9-54m3-f6rw, MINI-vc29-73c8-8v9r, MINI-vmq2-88wh-j458, MINI-vp35-hv43-3vpx, MINI-vw4c-5v66-wx7r, MINI-wgqr-cg9q-5rc2, MINI-x2wf-742c-59gf, MINI-x5g6-f2qx-cv6q, ROOT-APP-MAVEN-CVE-2026-54518, UBUNTU-CVE-2026-54518 ## 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 (Incorrect Authorization) ## 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 | Ecosystem | 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: 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](https://insights.sbomify.com/CVE-2018-11307/): Deserialization of Untrusted Data in jackson-databind (critical 9.8) - [CVE-2026-54512](https://insights.sbomify.com/CVE-2026-54512/): jackson-databind: PolymorphicTypeValidator bypass via generic type parameters allows arbitrary class instantiation (high 8.1) - [CVE-2026-54513](https://insights.sbomify.com/CVE-2026-54513/): jackson-databind: Array subtype allowlist bypass in BasicPolymorphicTypeValidator (allowIfSubTypeIsArray) (high 8.1) - [CVE-2020-14060](https://insights.sbomify.com/CVE-2020-14060/): Deserialization of untrusted data in Jackson Databind (high 8.1) - [CVE-2021-46877](https://insights.sbomify.com/CVE-2021-46877/): jackson-databind possible Denial of Service if using JDK serialization to serialize JsonNode (high 7.5) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2026-54518 and fix it if it is affected. What it is: 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. Exploitation: There is no known exploitation of CVE-2026-54518 in the wild and no public exploit code. Affected packages and fixed versions: - com.fasterxml.jackson.core:jackson-databind (Maven): affected from 2.21.0; fixed in 2.21.4 - com.fasterxml.jackson.core:jackson-databind (Maven): affected from 2.21.0; fixed in 2.21.4 - tools.jackson.core:jackson-databind (Maven): affected from 3.0.0; fixed in 3.1.4 - tools.jackson.core:jackson-databind (Maven): affected from 3.0.0; fixed in 3.1.4 Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2026-54518/ (Markdown: https://insights.sbomify.com/CVE-2026-54518/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2026-54518 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-54518 - OSV: https://osv.dev/vulnerability/CVE-2026-54518 --- From sbomify Insights: https://insights.sbomify.com/CVE-2026-54518/ Summaries are generated and may contain mistakes; the official description above is the record.