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CVE-2026-91777 high CVSS 7.5

Vulnerability in com.fasterxml.jackson.core:jackson-databind (CVE-2026-91777)

Summary

Vulnerability in com.fasterxml.jackson.core:jackson-databind (CVE-2026-91777). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 2.22.3 or later.

Original description

The description as published by the source.

Summary

When an @JsonIdentityInfo collection or map first creates N unresolved
object-ID references and later resolves the same IDs in reverse order,
jackson-databind scans the remaining pending-reference accumulator for each
resolution. A shallow JSON document whose size grows linearly can therefore
cause quadratic CPU work during deserialization.

Details

The affected path is forward-reference completion in
CollectionDeserializer.CollectionReferringAccumulator.resolveForwardReference()
and the corresponding map implementation. The implementation performs a
linear search of the pending accumulator for every resolved object ID.

The behavior is runtime-confirmed in jackson-databind 2.5.0, 2.22.1, and
3.2.1. Current 2.22 and 3.2 source branches retained the same design when
rechecked. A 2.4.0 control fails closed before successful reverse-order
completion, so 2.5.0 is the conservative runtime-confirmed affected floor.
The patched versions are: 2.18.11, 2.21.7, 2.22.3, 3.1.7 and 3.2.3.

The vulnerable application must deserialize attacker-influenced JSON into an
identity-enabled collection or map. The issue does not require deep nesting or
syntactically unusual JSON.

Suggested correction: replace repeated linear lookup/removal with a keyed
pending-reference structure or another design that provides linear or
amortized-linear completion. A regression should preserve input order,
duplicate-ID behavior, and unresolved-ID errors while bounding reverse-order
resolutio…

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-2026-91777 has been found in com.fasterxml.jackson.core:jackson-databind.
Risk of unauthorized operations or information disclosure. CVSS score: 7.5/10.
What to do: upgrade com.fasterxml.jackson.core:jackson-databind to 2.22.3 or later.
If unsure, ask your IT team or search "com.fasterxml.jackson.core:jackson-databind CVE-2026-91777" on the vendor's site.

CVE-2026-91777 (com.fasterxml.jackson.core:jackson-databind) — CWE-400 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 2.22.3 — 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-400) exists in com.fasterxml.jackson.core:jackson-databind.

📍 Affected scope

Check the vendor advisory for the affected versions of com.fasterxml.jackson.core:jackson-databind.

🔥 Severity

Severity: High (CVSS 7.5/10). Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 2.22.3.

🛡️ 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 2.22.3

    ステージング環境で 2.22.3 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":"2.22.3"}]}]
maven tools.jackson.core:jackson-databind
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.2.3"}]}]

References

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