CVE-2026-11856
Critical9.8Successfully using libcurl to do a transfer to a specific HTTP origin (`hostA`) with **Digest** authentication and then changing the origin to a different one (`hostB`) for a second transfer, reusing the same handle, makes libcurl wrongly pass on the `Authorization:` header field meant for `hostA`, to `hostB`.
- CVSS
- 9.8v3.1
- EPSS (exploit probability)
- 0.7%52th pct
- CISA KEV
- Not listed
EPSS trendFIRST daily scores, last 90 days
Daily values
| Score date | EPSS | Percentile |
|---|---|---|
| 2026-10-20 | 0.7% | 51.9% |
| 2026-10-19 | 0.7% | 51.8% |
| 2026-10-18 | 0.7% | 51.8% |
| 2026-10-16 | 0.7% | 51.7% |
| 2026-10-15 | 0.7% | 51.7% |
| 2026-10-14 | 0.7% | 51.6% |
| 2026-10-13 | 0.7% | 51.4% |
| 2026-10-12 | 0.7% | 51.4% |
| 2026-10-11 | 0.7% | 51.3% |
| 2026-10-10 | 0.7% | 51.3% |
| 2026-10-09 | 0.7% | 51.3% |
| 2026-10-08 | 0.7% | 51.2% |
| 2026-10-07 | 0.7% | 51.2% |
| 2026-10-06 | 0.7% | 51.1% |
| 2026-10-05 | 0.7% | 51.0% |
| 2026-10-04 | 0.7% | 51.0% |
| 2026-10-03 | 0.7% | 51.0% |
| 2026-10-02 | 0.7% | 51.0% |
| 2026-10-01 | 0.7% | 50.9% |
| 2026-09-30 | 0.7% | 50.9% |
| 2026-09-29 | 0.7% | 50.8% |
| 2026-09-27 | 0.7% | 50.8% |
| 2026-09-26 | 0.7% | 50.8% |
| 2026-09-25 | 0.7% | 50.7% |
| 2026-09-24 | 0.7% | 50.6% |
| 2026-09-23 | 0.7% | 51.3% |
| 2026-09-22 | 0.7% | 51.3% |
| 2026-09-21 | 0.7% | 50.9% |
| 2026-09-20 | 0.7% | 51.3% |
| 2026-09-19 | 0.7% | 51.3% |
| 2026-09-18 | 0.7% | 51.2% |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
- haxx curl