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CVE-2026-59889 medium CVSS 6.5

Authorization Flaw in com.fasterxml.jackson.core:jackson-databind (CVE-2026-59889)

Summary

Vulnerability in com.fasterxml.jackson.core:jackson-databind (CVE-2026-59889). Data can be tampered with by attackers. Exploitable via BeanDeserializer.deserializeWithUnwrapped. Mitigation: upgrade to 2.22.1 or later.

Original description

The description as published by the source.

Summary

UnwrappedPropertyHandler.processUnwrapped() replays the buffered JSON for a @JsonUnwrapped property by iterating its properties and calling prop.deserializeAndSet() with no prop.visibleInView(ctxt.getActiveView()) guard — the exact guard processUnwrappedCreatorProperties() received in the #5971 / GHSA-rcqc-6cw3-h962 fix, and the guard BeanDeserializer.deserializeWithUnwrapped applies to directly-matched properties. As a result, a property annotated with both @JsonView(PrivilegedView.class) and @JsonUnwrapped is written from attacker JSON even when deserializing under a more-restrictive active view.

Correction to the original framing (runtime-verified): the gap is NOT a per-field inner @JsonView (the unwrapped sub-object's own BeanDeserializer gates inner fields correctly). The unchecked gate is the view of the unwrapped CONTAINER property.

Intent proof (runtime, 2.x HEAD 21dd70dd and 3.x HEAD 7a5939d6)

An @JsonView(AdminView) property that is NOT @JsonUnwrapped → null under PublicView (correctly gated). The identical property WITH @JsonUnwrapped → fully populated (bypass). The fix the creator path already received, not applied to the regular-property method.

Impact — write-side mass-assignment / privilege escalation

@JsonView is commonly used as a write-side authorization guard: a public endpoint binds the body under readerWithView(PublicView.class) and groups privileged state in a nested object whose container…

Source: NIST National Vulnerability Database NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-59889 has been found in com.fasterxml.jackson.core:jackson-databind.
Attackers can target a specific entry point like BeanDeserializer.deserializeWithUnwrapped over the network to misuse the product.
Data can be tampered with by attackers. CVSS score: 6.5/10.
What to do: upgrade com.fasterxml.jackson.core:jackson-databind to 2.22.1 or later.
If unsure, ask your IT team or search "com.fasterxml.jackson.core:jackson-databind CVE-2026-59889" on the vendor's site.

CVE-2026-59889 (com.fasterxml.jackson.core:jackson-databind) — CWE-863 / CVSS v3 6.5
Attack vector: remote (network-reachable) / no user interaction
Attack surface: BeanDeserializer.deserializeWithUnwrapped / BeanDeserializer / null / PublicView
Patched: 2.22.1 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

Incorrect authorization (CWE-863) exists in com.fasterxml.jackson.core:jackson-databind. Attackers reach the vulnerable code path via BeanDeserializer.deserializeWithUnwrapped.

📍 Affected scope

Check the vendor advisory for the affected versions of com.fasterxml.jackson.core:jackson-databind. Attack surface: BeanDeserializer.deserializeWithUnwrapped / BeanDeserializer / null / PublicView.

🔥 Severity

Severity: Medium (CVSS 6.5/10). Data can be tampered with by attackers.

🔧 How to fix

Update to 2.22.1.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    Audit SBOM/dependencies for affected components.

    資産台帳・SBOM・依存マニフェストで com.fasterxml.jackson.core:jackson-databind を使っているサービスとバージョンを洗い出す。

  2. 2
    Apply patch patch 
    Upgrade com.fasterxml.jackson.core:jackson-databind to 2.22.1

    ステージング環境で 2.22.1 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。

  3. 3
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

maven com.fasterxml.jackson.core:jackson-databind
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.22.1"}]}]
maven tools.jackson.core:jackson-databind
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.2.1"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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