Answer in brief
CVE-2020-28491 records a High severity (CVSS 7.5) vulnerability in Denial of Service (DoS) in Jackson Dataformat CBOR. The current sources do not mark it as known exploited. The current feed maps com.fasterxml.jackson.dataformat:jackson-dataformat-cbor (maven), com.fasterxml.jackson.dataformat:jackson-dataformat-cbor (maven). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps com.fasterxml.jackson.dataformat:jackson-dataformat-cbor (maven), com.fasterxml.jackson.dataformat:jackson-dataformat-cbor (maven). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| com.fasterxml.jackson.dataformat:jackson-dataformat-cbormaven | >=2.8.0rc1 <2.11.4 | 2.11.4 |
| com.fasterxml.jackson.dataformat:jackson-dataformat-cbormaven | >=2.12.0rc1 <2.12.1 | 2.12.1 |
Published upstream
Dec 9, 2021
Evidence: source:osv:source_dates:source-dates:recordSource modified
Sep 10, 2026
Evidence: source:osv:source_dates:source-dates:recordFirst seen by HOL
Aug 7, 2026
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.
Quoted source text, attributed separately from HOL analysis.