CVE-2026-6276
High7.5Using libcurl, when a custom `Host:` header is first set for an HTTP request and a second request is subsequently done using the same *easy handle* but without the custom `Host:` header set, the second request would use stale information and pass on cookies meant for the first host in the second request. Leak them.
- CVSS
- 7.5v3.1
- EPSS (exploit probability)
- 0.3%27th pct
- CISA KEV
- Not listed
EPSS trendFIRST daily scores, last 90 days
Daily values
| Score date | EPSS | Percentile |
|---|---|---|
| 2026-10-20 | 0.3% | 27.1% |
| 2026-10-19 | 0.3% | 27.1% |
| 2026-10-18 | 0.3% | 27.0% |
| 2026-10-16 | 0.3% | 26.9% |
| 2026-10-15 | 0.3% | 26.9% |
| 2026-10-14 | 0.3% | 26.8% |
| 2026-10-13 | 0.3% | 26.7% |
| 2026-10-12 | 0.3% | 26.6% |
| 2026-10-11 | 0.3% | 26.6% |
| 2026-10-10 | 0.3% | 26.5% |
| 2026-10-09 | 0.3% | 26.5% |
| 2026-10-08 | 0.3% | 26.4% |
| 2026-10-07 | 0.3% | 26.4% |
| 2026-10-06 | 0.3% | 26.3% |
| 2026-10-05 | 0.3% | 26.2% |
| 2026-10-04 | 0.3% | 26.2% |
| 2026-10-03 | 0.3% | 26.2% |
| 2026-10-02 | 0.3% | 26.2% |
| 2026-10-01 | 0.3% | 26.1% |
| 2026-09-30 | 0.3% | 26.1% |
| 2026-09-29 | 0.3% | 26.0% |
| 2026-09-27 | 0.3% | 26.0% |
| 2026-09-26 | 0.3% | 25.9% |
| 2026-09-25 | 0.3% | 25.8% |
| 2026-09-24 | 0.3% | 25.7% |
| 2026-09-23 | 0.3% | 22.4% |
| 2026-09-22 | 0.3% | 22.3% |
| 2026-09-21 | 0.3% | 22.3% |
| 2026-09-20 | 0.3% | 22.3% |
| 2026-09-19 | 0.3% | 22.3% |
| 2026-09-18 | 0.3% | 22.3% |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
- haxx curl