Description
When curl is told to use the Certificate Status Request TLS extension, often
referred to as *OCSP stapling*, to verify that the server certificate is
valid, it fails to detect OCSP problems and instead wrongly consider the
response as fine.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| curl | curl | 8.19.0 – ≤ 8.19.0, 8.18.0 – ≤ 8.18.0, 8.17.0 – ≤ 8.17.0 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | curl +3 | 8.20.0-2.hum1 | RHSA-2026:19106 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | curl | 8.20.0-r0 | — |
| Alpine v3.23 | curl | 8.20.0-r0 | — |
Advisories 2
- WID-SEC-2026-1307 cURL: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 12, 2026
- RHSA-2026:19106 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 15, 2026