Answer in brief
CVE-2026-67355 records a High severity (CVSS 8.2) vulnerability in guzzlehttp/guzzle before 7.15.1 Host-only Cookie Scope. The current sources do not mark it as known exploited. The current feed maps guzzlehttp/guzzle (composer), guzzle/guzzle (generic), guzzlehttp/guzzle (packagist). 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 8.2. 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 guzzlehttp/guzzle (composer), guzzle/guzzle (generic), guzzlehttp/guzzle (packagist). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| guzzlehttp/guzzlecomposer | <7.15.1 | 7.15.1 |
| guzzle/guzzlegeneric | >=0 <7.15.1 | 7.15.1 |
| guzzlehttp/guzzlepackagist | >=0 <7.15.1 | 7.15.1 |
Published upstream
Aug 1, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 3, 2026
guzzlehttp/guzzle versions before 7.15.1 fail to preserve host-only cookie scope, storing the request host in the Domain field instead of marking cookies as host-only. Attackers controlling child hosts can receive host-only cookies intended only for parent hosts, potentially disclosing session identifiers and authorization tokens when the same cookie jar is reused across trust boundaries.
Quoted source text, attributed separately from HOL analysis.