Answer in brief
CVE-2021-35517 records a Unknown severity vulnerability in Apache Commons Compress 1.1 to 1.20 denial of service vulnerability. The current sources do not mark it as known exploited. The current feed maps Apache Software Foundation/Apache Commons Compress (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. 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 Apache Software Foundation/Apache Commons Compress (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Apache Software Foundation/Apache Commons Compressgeneric | >=1.1 <Apache Commons Compress* | Apache Commons Compress*, Apache |
Published upstream
Jul 13, 2021
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 8, 2026
When reading a specially crafted TAR archive, Compress can be made to allocate large amounts of memory that finally leads to an out of memory error even for very small inputs. This could be used to mount a denial of service attack against services that use Compress' tar package.
Quoted source text, attributed separately from HOL analysis.