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CVE-2026-54513 high CVSS 8.1

Vulnerability in Atlassian com.fasterxml.jackson.core:jackson-databind (CVE-2026-54513)

Summary

Vulnerability in Atlassian com.fasterxml.jackson.core:jackson-databind (CVE-2026-54513). Successful exploitation can lead to full system takeover. Exploitable via EvilType. Mitigation: upgrade to 3.1.4 or later.

Original description

The description as published by the source.

Summary

BasicPolymorphicTypeValidator.Builder.allowIfSubTypeIsArray() allowlists any array type based only on clazz.isArray(), without validating the array's component (element) type against the configured allowlist. A PTV built with allowIfSubTypeIsArray() plus an explicit concrete-type allowlist therefore still permits EvilType[] even though EvilType is not allowlisted. When Jackson deserializes the elements and no per-element type IDs are present, it instantiates the component type directly with no further PTV check, bypassing the allowlist.

Impact

Applications using BasicPolymorphicTypeValidator with allowIfSubTypeIsArray() as a safeguard get no protection for concrete array component types; an attacker controlling JSON can instantiate non-allowlisted types via an array wrapper, re-opening the gadget-instantiation risk PTV is meant to prevent.

Affected / Patched (verified via git tag --contains)

  • 2.18 line: >= 2.10.0, < 2.18.8 -> fixed in 2.18.8
  • 2.19-2.21 line: >= 2.19.0, < 2.21.4 -> fixed in 2.21.4
  • 3.x line: >= 3.0.0, < 3.1.4 -> fixed in 3.1.4

PolymorphicTypeValidator was added in 2.10.0 so vulnerability N/A for versions prior to that.

Severity / CWE

Maintainer: significant. Reporter: HIGH. CWE-184 (Incomplete List of Disallowed Inputs); related CWE-502.

Upstream fix

FasterXML/jackson-databind#5981; fix PR #5983 (24529da), 2.18 backport PR #5984 (01d1692). Released 2026-06-04 in 2.18.8 / 2.21.4 / 3.1.4.

##…

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-2026-54513 has been found in Atlassian com.fasterxml.jackson.core:jackson-databind.
Attackers can target a specific entry point like EvilType over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: 8.1/10.
What to do: upgrade Atlassian com.fasterxml.jackson.core:jackson-databind to 3.1.4 or later.
If unsure, ask your IT team or search "Atlassian com.fasterxml.jackson.core:jackson-databind CVE-2026-54513" on the vendor's site.

CVE-2026-54513 (Atlassian com.fasterxml.jackson.core:jackson-databind) — CWE-184 / CVSS v3 8.1
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: EvilType / BasicPolymorphicTypeValidator / PolymorphicTypeValidator
Patched: 3.1.4 — 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

A vulnerability (CWE-184) exists in Atlassian com.fasterxml.jackson.core:jackson-databind. Attackers reach the vulnerable code path via EvilType without authentication.

📍 Affected scope

Check the vendor advisory for the affected versions of Atlassian com.fasterxml.jackson.core:jackson-databind. Attack surface: EvilType / BasicPolymorphicTypeValidator / PolymorphicTypeValidator.

🔥 Severity

Severity: High (CVSS 8.1/10). Successful exploitation can lead to full system takeover.

🔧 How to fix

Update to 3.1.4.

🛡️ 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 Atlassian 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 Atlassian com.fasterxml.jackson.core:jackson-databind to 3.1.4

    ステージング環境で 3.1.4 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":"3.1.4"}]}]
maven tools.jackson.core:jackson-databind
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.1.4"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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