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High, CVSS 7.5amended

jackson-databind retains every unknown raw type ID

CVE-2026-91776GHSA-wv8q-qhhj-9h54

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (tools.jackson.core:jackson-databind 3.2.3, 3.1.7; com.fasterxml.jackson.core:jackson-databind 2.22.3, 2.21.7, 2.18.11), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
  • CVE-2026-91776: 0.49% estimated exploitation activity in the next 30 days; percentile 41.97 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Summary With @JsonTypeInfo(use = Id.NAME, defaultImpl = ...), every distinct unknown raw type ID selects the same fallback deserializer but is retained as a separate key in TypeDeserializerBase.deserializers. An attacker who can repeatedly supply new unknown type IDs can grow this process-lifetime cache without a configured bound. Details The affected path is TypeDeserializerBase.findDeserializer(). After an unknown name-based type ID resolves to the configured fallback/default implementation, jackson-databind caches the result under the attacker-provided raw typeId. Although all such IDs select the same fallback deserializer, each new string remains a distinct cache key. The behavior is runtime-confirmed in jackson-databind 2.22.1 and 3.2.1. Current 2.22 and 3.2 source branches retained the unbounded deserializers map and per-raw-ID cache write when rechecked. The earlier affected floor has not been established, patched versions are: 2.18.11, 2.21.7, 2.22.3, 3.1.7 and 3.2.3. The…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-wv8q-qhhj-9h54

  2. Revision 1 · created ·

    Published from osv record GHSA-wv8q-qhhj-9h54

Agent brief

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# Patch Next advisory brief: CVE-2026-91776

Advisory: jackson-databind retains every unknown raw type ID
IDs: CVE-2026-91776, GHSA-wv8q-qhhj-9h54
Record: https://patchnext.com/advisories/cve-2026-91776 (revision 2, source checked 26 Oct 2026, 16:56 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: tools.jackson.core:jackson-databind 3.2.3, 3.1.7; com.fasterxml.jackson.core:jackson-databind 2.22.3, 2.21.7, 2.18.11. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven tools.jackson.core:jackson-databind: affected >= 3.0.0, <= 3.1.6; >= 3.2.0, <= 3.2.2; fixed in 3.2.3, 3.1.7
- Maven com.fasterxml.jackson.core:jackson-databind: affected >= 2.0.0, <= 2.18.10; >= 2.19.0, <= 2.21.6; >= 2.22.0, <= 2.22.2; fixed in 2.18.11, 2.22.3, 2.21.7

## Suggested inspection (read-only)
- Maven tools.jackson.core:jackson-databind: check the installed version with your package manager.
- Maven com.fasterxml.jackson.core:jackson-databind: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on tools.jackson.core:jackson-databind, com.fasterxml.jackson.core:jackson-databind.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-wv8q-qhhj-9h54 (OSV record GHSA-wv8q-qhhj-9h54 lists affected ranges: Maven com.fasterxml.jackson.core:jackson-databind >=2.0.0 =2.19.0 =2.22.0 =3.0.0 =3.2.0 <3.2.3 (fixed))
- Verified: https://github.com/advisories/GHSA-wv8q-qhhj-9h54 (GitHub-reviewed advisory GHSA-wv8q-qhhj-9h54 lists affected ranges: Maven com.fasterxml.jackson.core:jackson-databind >=2.0.0 =2.19.0 =2.22.0 =3.0.0 =3.2.0 <=3.2.2)

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