Answer in brief
CVE-2026-6321 records a High severity (CVSS 7.5) vulnerability in fast-uri vulnerable to path traversal via percent-encoded dot segments. The current sources do not mark it as known exploited. The current feed maps fast-uri/fast-uri (generic), fast-uri (npm), fast-uri (npm), fast-uri (npm) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
Answer in brief
CVE-2026-6321 records a High severity (CVSS 7.5) vulnerability in fast-uri vulnerable to path traversal via percent-encoded dot segments. The current sources do not mark it as known exploited. The current feed maps fast-uri/fast-uri (generic), fast-uri (npm), fast-uri (npm), fast-uri (npm) and additional mapped packages. 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 fast-uri/fast-uri (generic), fast-uri (npm), fast-uri (npm), fast-uri (npm) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| fast-uri/fast-urigeneric | >=0 <3.1.1 | 3.1.1 |
| fast-urinpm | >=3.0.0 <3.1.1 | 3.1.1 |
| fast-urinpm | >=0 <2.4.1 | 2.4.1 |
| fast-urinpm | >=3.0.0,<=3.1.0 | 3.1.1 |
| fast-urinpm | <=2.4.0 | 2.4.1 |
Published upstream
May 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 2, 2026
fast-uri decoded percent-encoded path separators and dot segments before applying dot-segment removal in its normalize() and equal() functions. Encoded path data was treated like real slashes and parent-directory references, so distinct URIs could collapse onto the same normalized path. Applications that normalize or compare attacker-controlled URLs to enforce path-based policy can be bypassed, with a path that appears confined under an allowed prefix normalizing to a different location. Versions <= 3.1.0 are affected. Update to 3.1.1 or later.
Quoted source text, attributed separately from HOL analysis.
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 fast-uri/fast-uri (generic), fast-uri (npm), fast-uri (npm), fast-uri (npm) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| fast-uri/fast-urigeneric | >=0 <3.1.1 | 3.1.1 |
| fast-urinpm | >=3.0.0 <3.1.1 | 3.1.1 |
| fast-urinpm | >=0 <2.4.1 | 2.4.1 |
| fast-urinpm | >=3.0.0,<=3.1.0 | 3.1.1 |
| fast-urinpm | <=2.4.0 | 2.4.1 |
Published upstream
May 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 2, 2026
fast-uri decoded percent-encoded path separators and dot segments before applying dot-segment removal in its normalize() and equal() functions. Encoded path data was treated like real slashes and parent-directory references, so distinct URIs could collapse onto the same normalized path. Applications that normalize or compare attacker-controlled URLs to enforce path-based policy can be bypassed, with a path that appears confined under an allowed prefix normalizing to a different location. Versions <= 3.1.0 are affected. Update to 3.1.1 or later.
Quoted source text, attributed separately from HOL analysis.