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High, CVSS 7.5

Denial of Service (DoS) in Jackson Dataformat CBOR

CVE-2020-28491GHSA-xmc8-26q4-qjhx

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (com.fasterxml.jackson.dataformat:jackson-dataformat-cbor 2.12.1, 2.11.4), 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

  • GitHub Advisory Database and maintainer security advisories on GitHub

    GitHub-reviewed advisory GHSA-xmc8-26q4-qjhx lists affected ranges: Maven com.fasterxml.jackson.dataformat:jackson-dataformat-cbor >=2.8.0rc1 =2.12.0rc1 <2.12.1

    VerifiedObserved Structured GitHub Advisory Database record (type=reviewed) from the GitHub REST API.

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-2020-28491: 3.07% estimated exploitation activity in the next 30 days; percentile 87.67 (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.

This affects the package com.fasterxml.jackson.dataformat:jackson-dataformat-cbor from 2.8.0-rc1 and before 2.11.4, from 2.12.0-rc1 and before 2.12.1. Unchecked allocation of byte buffer can cause a java.lang.OutOfMemoryError exception.

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

    Published from ghsa record GHSA-xmc8-26q4-qjhx

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2020-28491

Advisory: Denial of Service (DoS) in Jackson Dataformat CBOR
IDs: CVE-2020-28491, GHSA-xmc8-26q4-qjhx
Record: https://patchnext.com/advisories/cve-2020-28491 (revision 1, source checked 26 Oct 2026, 16:11 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: com.fasterxml.jackson.dataformat:jackson-dataformat-cbor 2.12.1, 2.11.4. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven com.fasterxml.jackson.dataformat:jackson-dataformat-cbor: affected >= 2.8.0rc1, < 2.11.4; >= 2.12.0rc1, < 2.12.1; fixed in 2.11.4, 2.12.1

## Suggested inspection (read-only)
- Maven com.fasterxml.jackson.dataformat:jackson-dataformat-cbor: 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 com.fasterxml.jackson.dataformat:jackson-dataformat-cbor.
- 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://github.com/advisories/GHSA-xmc8-26q4-qjhx (GitHub-reviewed advisory GHSA-xmc8-26q4-qjhx lists affected ranges: Maven com.fasterxml.jackson.dataformat:jackson-dataformat-cbor >=2.8.0rc1 =2.12.0rc1 <2.12.1)

Commands are suggestions: review each one before running it.

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