Vulnerability details
CVE-2026-87866
curl curl
wolfSSL public-key pinning bypass
CVSS 3.1
9.1Critical
Official description
When built with wolfSSL, curl can successfully validate a pinned public key hash against a key the TLS peer does not possess. During the TLS handshake, wolfSSL validates the connection, but curl's subsequent re-parsing of the same certificate - tricked by a manipulated validity length field - extracts and matches a different embedded key, incorrectly authorizing the pinned public key.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.1Critical | 3.1 | CISA ADP / Vulnrichment (CISA-ADP) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| curl | curl | 7.43.0 ≤ v ≤ 7.43.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.44.0 ≤ v ≤ 7.44.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.45.0 ≤ v ≤ 7.45.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.46.0 ≤ v ≤ 7.46.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.47.0 ≤ v ≤ 7.47.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.47.1 ≤ v ≤ 7.47.1 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.48.0 ≤ v ≤ 7.48.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.49.0 ≤ v ≤ 7.49.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.49.1 ≤ v ≤ 7.49.1 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.50.0 ≤ v ≤ 7.50.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.50.1 ≤ v ≤ 7.50.1 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.50.2 ≤ v ≤ 7.50.2 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.50.3 ≤ v ≤ 7.50.3 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.51.0 ≤ v ≤ 7.51.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.52.0 ≤ v ≤ 7.52.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.52.1 ≤ v ≤ 7.52.1 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.53.0 ≤ v ≤ 7.53.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.53.1 ≤ v ≤ 7.53.1 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.54.0 ≤ v ≤ 7.54.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.54.1 ≤ v ≤ 7.54.1 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.55.0 ≤ v ≤ 7.55.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.55.1 ≤ v ≤ 7.55.1 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.56.0 ≤ v ≤ 7.56.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.56.1 ≤ v ≤ 7.56.1 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.57.0 ≤ v ≤ 7.57.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.58.0 ≤ v ≤ 7.58.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.59.0 ≤ v ≤ 7.59.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.60.0 ≤ v ≤ 7.60.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.61.0 ≤ v ≤ 7.61.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.61.1 ≤ v ≤ 7.61.1 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.62.0 ≤ v ≤ 7.62.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.63.0 ≤ v ≤ 7.63.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.64.0 ≤ v ≤ 7.64.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.64.1 ≤ v ≤ 7.64.1 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.65.0 ≤ v ≤ 7.65.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.65.1 ≤ v ≤ 7.65.1 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.65.2 ≤ v ≤ 7.65.2 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.65.3 ≤ v ≤ 7.65.3 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.66.0 ≤ v ≤ 7.66.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.67.0 ≤ v ≤ 7.67.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.68.0 ≤ v ≤ 7.68.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.69.0 ≤ v ≤ 7.69.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.69.1 ≤ v ≤ 7.69.1 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.70.0 ≤ v ≤ 7.70.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.71.0 ≤ v ≤ 7.71.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.71.1 ≤ v ≤ 7.71.1 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.72.0 ≤ v ≤ 7.72.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.73.0 ≤ v ≤ 7.73.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.74.0 ≤ v ≤ 7.74.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.75.0 ≤ v ≤ 7.75.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.76.0 ≤ v ≤ 7.76.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.76.1 ≤ v ≤ 7.76.1 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.77.0 ≤ v ≤ 7.77.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.78.0 ≤ v ≤ 7.78.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.79.0 ≤ v ≤ 7.79.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.79.1 ≤ v ≤ 7.79.1 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.80.0 ≤ v ≤ 7.80.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.81.0 ≤ v ≤ 7.81.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.82.0 ≤ v ≤ 7.82.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.83.0 ≤ v ≤ 7.83.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.83.1 ≤ v ≤ 7.83.1 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.84.0 ≤ v ≤ 7.84.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.85.0 ≤ v ≤ 7.85.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.86.0 ≤ v ≤ 7.86.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.87.0 ≤ v ≤ 7.87.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.88.0 ≤ v ≤ 7.88.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 7.88.1 ≤ v ≤ 7.88.1 | CVEProject cvelistV5 (CNA) |
| curl | curl | 8.0.0 ≤ v ≤ 8.0.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 8.0.1 ≤ v ≤ 8.0.1 | CVEProject cvelistV5 (CNA) |
| curl | curl | 8.1.0 ≤ v ≤ 8.1.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 8.1.1 ≤ v ≤ 8.1.1 | CVEProject cvelistV5 (CNA) |
| curl | curl | 8.1.2 ≤ v ≤ 8.1.2 | CVEProject cvelistV5 (CNA) |
| curl | curl | 8.10.0 ≤ v ≤ 8.10.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 8.10.1 ≤ v ≤ 8.10.1 | CVEProject cvelistV5 (CNA) |
| curl | curl | 8.11.0 ≤ v ≤ 8.11.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 8.11.1 ≤ v ≤ 8.11.1 | CVEProject cvelistV5 (CNA) |
| curl | curl | 8.12.0 ≤ v ≤ 8.12.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 8.12.1 ≤ v ≤ 8.12.1 | CVEProject cvelistV5 (CNA) |
| curl | curl | 8.13.0 ≤ v ≤ 8.13.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 8.14.0 ≤ v ≤ 8.14.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 8.14.1 ≤ v ≤ 8.14.1 | CVEProject cvelistV5 (CNA) |
| curl | curl | 8.15.0 ≤ v ≤ 8.15.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 8.16.0 ≤ v ≤ 8.16.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 8.17.0 ≤ v ≤ 8.17.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 8.18.0 ≤ v ≤ 8.18.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 8.19.0 ≤ v ≤ 8.19.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 8.2.0 ≤ v ≤ 8.2.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 8.2.1 ≤ v ≤ 8.2.1 | CVEProject cvelistV5 (CNA) |
| curl | curl | 8.20.0 ≤ v ≤ 8.20.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 8.21.0 ≤ v ≤ 8.21.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 8.22.0 ≤ v ≤ 8.22.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 8.3.0 ≤ v ≤ 8.3.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 8.4.0 ≤ v ≤ 8.4.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 8.5.0 ≤ v ≤ 8.5.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 8.6.0 ≤ v ≤ 8.6.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 8.7.0 ≤ v ≤ 8.7.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 8.7.1 ≤ v ≤ 8.7.1 | CVEProject cvelistV5 (CNA) |
| curl | curl | 8.8.0 ≤ v ≤ 8.8.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 8.9.0 ≤ v ≤ 8.9.0 | CVEProject cvelistV5 (CNA) |
| curl | curl | 8.9.1 ≤ v ≤ 8.9.1 | CVEProject cvelistV5 (CNA) |
References and advisories
3
Kolun on Telegram @kolunsec
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Details
- Published
- 2026-10-20
- Last updated
- 2026-10-29
- State
- Published
- Assigner (CNA)
- curl
- Kolun priority
- 25 · Low
Exploit prediction (EPSS)
0.51%
Probability of exploitation in 30 days
43.7%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- Proof of concept
- Technical impact
- Total
Weaknesses (CWE)
- CWE-295Improper Certificate Validation