Answer in brief
CVE-2026-6253 records a Unknown severity vulnerability in proxy credentials leak over redirect-to proxy. The current sources do not mark it as known exploited. The current feed maps curl/curl (generic), curl/curl (generic), curl/curl (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 curl/curl (generic), curl/curl (generic), curl/curl (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| curl/curlgeneric | >=7.14.1 <8.14.2 || >=8.15.0 <8.16.1 || >=8.17.0 <8.20.0 | 8.14.2, 8.16.1, 8.20.0 |
| curl/curlgeneric | >=3b60bb725913ce7339aefef0a14b12df4c24db60 <188c2f166a20fa97c2325b2da7d0e5cecc13725f | 188c2f166a20fa97c2325b2da7d0e5cecc13725f |
| curl/curlgeneric | 8.19.0 || 8.18.0 || 8.17.0 || 8.16.0 || 8.15.0 || 8.14.1 || 8.14.0 || 8.13.0 || 8.12.1 || 8.12.0 || 8.11.1 || 8.11.0 || 8.10.1 || 8.10.0 || 8.9.1 || 8.9.0 || 8.8.0 || 8.7.1 || 8.7.0 || 8.6.0 || 8.5.0 || 8.4.0 || 8.3.0 || 8.2.1 || 8.2.0 || 8.1.2 || 8.1.1 || 8.1.0 || 8.0.1 || 8.0.0 || 7.88.1 || 7.88.0 || 7.87.0 || 7.86.0 || 7.85.0 || 7.84.0 || 7.83.1 || 7.83.0 || 7.82.0 || 7.81.0 || 7.80.0 || 7.79.1 || 7.79.0 || 7.78.0 || 7.77.0 || 7.76.1 || 7.76.0 || 7.75.0 || 7.74.0 || 7.73.0 || 7.72.0 || 7.71.1 || 7.71.0 || 7.70.0 || 7.69.1 || 7.69.0 || 7.68.0 || 7.67.0 || 7.66.0 || 7.65.3 || 7.65.2 || 7.65.1 || 7.65.0 || 7.64.1 || 7.64.0 || 7.63.0 || 7.62.0 || 7.61.1 || 7.61.0 || 7.60.0 || 7.59.0 || 7.58.0 || 7.57.0 || 7.56.1 || 7.56.0 || 7.55.1 || 7.55.0 || 7.54.1 || 7.54.0 || 7.53.1 || 7.53.0 || 7.52.1 || 7.52.0 || 7.51.0 || 7.50.3 || 7.50.2 || 7.50.1 || 7.50.0 || 7.49.1 || 7.49.0 || 7.48.0 || 7.47.1 || 7.47.0 || 7.46.0 || 7.45.0 || 7.44.0 || 7.43.0 || 7.42.1 || 7.42.0 || 7.41.0 || 7.40.0 || 7.39.0 || 7.38.0 || 7.37.1 || 7.37.0 || 7.36.0 || 7.35.0 || 7.34.0 || 7.33.0 || 7.32.0 || 7.31.0 || 7.30.0 || 7.29.0 || 7.28.1 || 7.28.0 || 7.27.0 || 7.26.0 || 7.25.0 || 7.24.0 || 7.23.1 || 7.23.0 || 7.22.0 || 7.21.7 || 7.21.6 || 7.21.5 || 7.21.4 || 7.21.3 || 7.21.2 || 7.21.1 || 7.21.0 || 7.20.1 || 7.20.0 || 7.19.7 || 7.19.6 || 7.19.5 || 7.19.4 || 7.19.3 || 7.19.2 || 7.19.1 || 7.19.0 || 7.18.2 || 7.18.1 || 7.18.0 || 7.17.1 || 7.17.0 || 7.16.4 || 7.16.3 || 7.16.2 || 7.16.1 || 7.16.0 || 7.15.5 || 7.15.4 || 7.15.3 || 7.15.2 || 7.15.1 || 7.15.0 || 7.14.1 | Not reported |
Published upstream
May 13, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 15, 2026
curl might erroneously pass on credentials for a first proxy to a second proxy. This can happen when the following conditions are true: 1. curl is setup to use specific different proxies for different URL schemes 2. the first proxy needs credentials 3. the second proxy uses no credentials 4. while using the first proxy (using say `http://`), curl is asked to follow a redirect to a URL using another scheme (say `https://`), accessed using a second, different, proxy
Quoted source text, attributed separately from HOL analysis.