Answer in brief
CVE-2026-67339 records a Medium severity (CVSS 6.9) vulnerability in guzzlehttp/guzzle before 7.14.2 Proxy-Authorization Header Disclosure. 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 6.9. 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 | <7.14.2 | 7.14.2 |
| guzzle/guzzlegeneric | >=0 <7.14.2 | 7.14.2 |
| guzzlehttp/guzzlepackagist | >=0 <7.14.2 | 7.14.2 |
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 7.14.2 fail to properly isolate Proxy-Authorization headers from origin servers in cURL handlers. Attackers can capture proxy credentials through origin server access logs when requests are redirected, bypassed, or sent through SOCKS proxies that Guzzle misclassifies as direct connections.
Quoted source text, attributed separately from HOL analysis.