Answer in brief
CVE-2026-4873 records a Medium severity (CVSS 5.9) vulnerability in connection reuse ignores TLS requirement. 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.
CVSS is 5.9. 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 curl/curl (generic), curl/curl (generic), curl/curl (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| curl/curlgeneric | >=7.20.0 <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 | >=ec3bb8f727405642a471b4b1b9eb0118fc003104 <507e7be573b0a76fca597b75ff7cb27a66e7d865 | 507e7be573b0a76fca597b75ff7cb27a66e7d865 |
| 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 | 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
A vulnerability exists where a connection requiring TLS incorrectly reuses an existing unencrypted connection from the same connection pool. If an initial transfer is made in clear-text (via IMAP, SMTP, or POP3), a subsequent request to that same host bypasses the TLS requirement and instead transmit data unencrypted.
Quoted source text, attributed separately from HOL analysis.