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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.
AI summary snake-internal / snake-material-v2
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`` without authentication.
📍 Affected scope
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. Run `grep -r 'com.fasterxml.jackson.core:jackson-databind' .` against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response Actions (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'com.fasterxml.jackson.core:jackson-databind' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で `com.fasterxml.jackson.core:jackson-databind` を grep し、稼働しているサービス・バージョンを把握する。
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6Apply 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と、Step 3 で見つけた異常検知の続報チェックを含めること。
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7Post-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 Step 3 と同じログクエリ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"}]}]
References
- web https://github.com/FasterXML/jackson-databind/commit/d627a8a86fcb062429282f79f3f256f181ed2c7b
- web https://github.com/FasterXML/jackson-databind/issues/6060
- web https://github.com/FasterXML/jackson-databind/pull/6056
- web https://github.com/FasterXML/jackson-databind/security/advisories/GHSA-5gvw-p9qm-jgwh
- web https://nvd.nist.gov/vuln/detail/CVE-2026-59889
- web https://github.com/advisories/GHSA-5gvw-p9qm-jgwh