Authorization Flaw in com.fasterxml.jackson.core:jackson-databind (CVE-2026-54518)
Summary
Vulnerability in com.fasterxml.jackson.core:jackson-databind (CVE-2026-54518). Risk of unauthorized operations or information disclosure. Exploitable via d633bc0. Mitigation: upgrade to 2.21.4 or later.
Original description
The description as published by the source.
Summary
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.
Impact
View-restricted unwrapped creator parameters can be set from untrusted input where @JsonView is used as a write-side authorization boundary.
Affected / Patched (verified via git tag --contains)
- 2.21 line:
>= 2.21.0, < 2.21.4-> fixed in 2.21.4 (backport721fa07, #5973) - 3.x line:
>= 3.0.0, < 3.1.4-> fixed in 3.1.4 (#5971,d633bc0)
Severity / CWE
Maintainer: minor. Reporter: HIGH. CWE-863 (Incorrect Authorization); related CWE-284.
Credits
Omkhar Arasaratnam (@omkhar) - finder.
Source: GitHub Security Advisories (Global) 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-2026-54518 has been found in com.fasterxml.jackson.core:jackson-databind.
Attackers can target a specific entry point like d633bc0 over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 6.5/10.
What to do: upgrade com.fasterxml.jackson.core:jackson-databind to 2.21.4 or later.
If unsure, ask your IT team or search "com.fasterxml.jackson.core:jackson-databind CVE-2026-54518" on the vendor's site.
CVE-2026-54518 (com.fasterxml.jackson.core:jackson-databind) — CWE-863 / CVSS v3 6.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: d633bc0
Patched: 2.21.4 — 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.
Incorrect authorization (CWE-863) exists in com.fasterxml.jackson.core:jackson-databind. Attackers reach the vulnerable code path via d633bc0 without authentication.
Check the vendor advisory for the affected versions of com.fasterxml.jackson.core:jackson-databind. Attack surface: d633bc0.
Severity: Medium (CVSS 6.5/10). Risk of unauthorized operations or information disclosure.
Update to 2.21.4.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
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
-
1Identify 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。
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2Apply patch patch
Upgrade com.fasterxml.jackson.core:jackson-databind to 2.21.4ステージング環境で 2.21.4 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。
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3Post-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
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Ubuntu UBUNTU-CVE-2026-54518 jackson-databind
References
- web github.com
- web github.com
- web github.com
- web github.com
- web github.com
- web github.com
- web nvd.nist.gov