Answer in brief
CVE-2026-67354 records a High severity (CVSS 8.2) vulnerability in guzzlehttp/guzzle before 7.15.1 URI Fragment Disclosure via Referer. 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 contain an information disclosure vulnerability in RedirectMiddleware. When the optional allow_redirects.referer setting is enabled, the middleware copies the URI fragment (the portion after '#') from the referring request into the generated Referer header when following a same-scheme redirect (e.g., HTTPS to HTTPS). An attacker who controls the redirect destination can read this fragment from the incoming Referer header, potentially disclosing one-time login secrets, access tokens, state values, or other sensitive client data to a server never meant to receive it. The referer setting is disabled by default. Fixed in 7.15.1, which strips the fragment before generating the Referer value.
Quoted source text, attributed separately from HOL analysis.