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Summary
| CVE | CVE-2026-82209 |
|---|---|
| State | PUBLISHED |
| Assigner | curl |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-09-06 18:17:22 UTC |
| Updated | 2026-09-15 07:16:31 UTC |
| Description | When libpsl support is enabled, libcurl fails to enforce the Public Suffix List boundary check when processing a `Set-Cookie` header where the `Domain` attribute explicitly matches an origin host that is itself a public suffix (e.g., `Domain=co.uk` set by `co.uk`). Instead of coercing it into a strict host-only cookie, libcurl saves the cookie with wildcard domain scope (`.co.uk`). Consequently, the cookie is inappropriately included in subsequent outbound requests or HTTP redirects to arbitrary sibling subdomains under the same public suffix (e.g., `attacker.co.uk`). |
Risk And Classification
Primary CVSS: v3.1 8.2 HIGH from ADP
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
EPSS: 0.005400000 probability, percentile 0.439080000 (date 2026-09-15)
Problem Types: CWE-201 | CWE-201 Information Exposure Through Sent Data | CWE-201 CWE-201 Insertion of Sensitive Information Into Sent Data
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | ADP | DECLARED | 8.2 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N |
| 3.1 | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | Secondary | 8.2 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
LowIntegrity
HighAvailability
NoneCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
NVD Known Affected Configurations (CPE 2.3)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Curl | Curl | affected 7.46.0 8.14.2 semver | Not specified |
| CNA | Curl | Curl | affected 8.15.0 8.16.1 semver | Not specified |
| CNA | Curl | Curl | affected 8.17.0 8.20.1 semver | Not specified |
| CNA | Curl | Curl | affected 8.21.0 8.22.0 semver | Not specified |
| CNA | Curl | Curl | affected e77b5b7453c1e8ccd7ec0816890d98e2f392e465 95c1e8915dce64606bd753fd47fc0bd236e31cd6 git | Not specified |
| CNA | Curl | Curl | affected 8.21.0 | Not specified |
| CNA | Curl | Curl | affected 8.20.0 | Not specified |
| CNA | Curl | Curl | affected 8.19.0 | Not specified |
| CNA | Curl | Curl | affected 8.18.0 | Not specified |
| CNA | Curl | Curl | affected 8.17.0 | Not specified |
| CNA | Curl | Curl | affected 8.16.0 | Not specified |
| CNA | Curl | Curl | affected 8.15.0 | Not specified |
| CNA | Curl | Curl | affected 8.14.1 | Not specified |
| CNA | Curl | Curl | affected 8.14.0 | Not specified |
| CNA | Curl | Curl | affected 8.13.0 | Not specified |
| CNA | Curl | Curl | affected 8.12.1 | Not specified |
| CNA | Curl | Curl | affected 8.12.0 | Not specified |
| CNA | Curl | Curl | affected 8.11.1 | Not specified |
| CNA | Curl | Curl | affected 8.11.0 | Not specified |
| CNA | Curl | Curl | affected 8.10.1 | Not specified |
| CNA | Curl | Curl | affected 8.10.0 | Not specified |
| CNA | Curl | Curl | affected 8.9.1 | Not specified |
| CNA | Curl | Curl | affected 8.9.0 | Not specified |
| CNA | Curl | Curl | affected 8.8.0 | Not specified |
| CNA | Curl | Curl | affected 8.7.1 | Not specified |
| CNA | Curl | Curl | affected 8.7.0 | Not specified |
| CNA | Curl | Curl | affected 8.6.0 | Not specified |
| CNA | Curl | Curl | affected 8.5.0 | Not specified |
| CNA | Curl | Curl | affected 8.4.0 | Not specified |
| CNA | Curl | Curl | affected 8.3.0 | Not specified |
| CNA | Curl | Curl | affected 8.2.1 | Not specified |
| CNA | Curl | Curl | affected 8.2.0 | Not specified |
| CNA | Curl | Curl | affected 8.1.2 | Not specified |
| CNA | Curl | Curl | affected 8.1.1 | Not specified |
| CNA | Curl | Curl | affected 8.1.0 | Not specified |
| CNA | Curl | Curl | affected 8.0.1 | Not specified |
| CNA | Curl | Curl | affected 8.0.0 | Not specified |
| CNA | Curl | Curl | affected 7.88.1 | Not specified |
| CNA | Curl | Curl | affected 7.88.0 | Not specified |
| CNA | Curl | Curl | affected 7.87.0 | Not specified |
| CNA | Curl | Curl | affected 7.86.0 | Not specified |
| CNA | Curl | Curl | affected 7.85.0 | Not specified |
| CNA | Curl | Curl | affected 7.84.0 | Not specified |
| CNA | Curl | Curl | affected 7.83.1 | Not specified |
| CNA | Curl | Curl | affected 7.83.0 | Not specified |
| CNA | Curl | Curl | affected 7.82.0 | Not specified |
| CNA | Curl | Curl | affected 7.81.0 | Not specified |
| CNA | Curl | Curl | affected 7.80.0 | Not specified |
| CNA | Curl | Curl | affected 7.79.1 | Not specified |
| CNA | Curl | Curl | affected 7.79.0 | Not specified |
| CNA | Curl | Curl | affected 7.78.0 | Not specified |
| CNA | Curl | Curl | affected 7.77.0 | Not specified |
| CNA | Curl | Curl | affected 7.76.1 | Not specified |
| CNA | Curl | Curl | affected 7.76.0 | Not specified |
| CNA | Curl | Curl | affected 7.75.0 | Not specified |
| CNA | Curl | Curl | affected 7.74.0 | Not specified |
| CNA | Curl | Curl | affected 7.73.0 | Not specified |
| CNA | Curl | Curl | affected 7.72.0 | Not specified |
| CNA | Curl | Curl | affected 7.71.1 | Not specified |
| CNA | Curl | Curl | affected 7.71.0 | Not specified |
| CNA | Curl | Curl | affected 7.70.0 | Not specified |
| CNA | Curl | Curl | affected 7.69.1 | Not specified |
| CNA | Curl | Curl | affected 7.69.0 | Not specified |
| CNA | Curl | Curl | affected 7.68.0 | Not specified |
| CNA | Curl | Curl | affected 7.67.0 | Not specified |
| CNA | Curl | Curl | affected 7.66.0 | Not specified |
| CNA | Curl | Curl | affected 7.65.3 | Not specified |
| CNA | Curl | Curl | affected 7.65.2 | Not specified |
| CNA | Curl | Curl | affected 7.65.1 | Not specified |
| CNA | Curl | Curl | affected 7.65.0 | Not specified |
| CNA | Curl | Curl | affected 7.64.1 | Not specified |
| CNA | Curl | Curl | affected 7.64.0 | Not specified |
| CNA | Curl | Curl | affected 7.63.0 | Not specified |
| CNA | Curl | Curl | affected 7.62.0 | Not specified |
| CNA | Curl | Curl | affected 7.61.1 | Not specified |
| CNA | Curl | Curl | affected 7.61.0 | Not specified |
| CNA | Curl | Curl | affected 7.60.0 | Not specified |
| CNA | Curl | Curl | affected 7.59.0 | Not specified |
| CNA | Curl | Curl | affected 7.58.0 | Not specified |
| CNA | Curl | Curl | affected 7.57.0 | Not specified |
| CNA | Curl | Curl | affected 7.56.1 | Not specified |
| CNA | Curl | Curl | affected 7.56.0 | Not specified |
| CNA | Curl | Curl | affected 7.55.1 | Not specified |
| CNA | Curl | Curl | affected 7.55.0 | Not specified |
| CNA | Curl | Curl | affected 7.54.1 | Not specified |
| CNA | Curl | Curl | affected 7.54.0 | Not specified |
| CNA | Curl | Curl | affected 7.53.1 | Not specified |
| CNA | Curl | Curl | affected 7.53.0 | Not specified |
| CNA | Curl | Curl | affected 7.52.1 | Not specified |
| CNA | Curl | Curl | affected 7.52.0 | Not specified |
| CNA | Curl | Curl | affected 7.51.0 | Not specified |
| CNA | Curl | Curl | affected 7.50.3 | Not specified |
| CNA | Curl | Curl | affected 7.50.2 | Not specified |
| CNA | Curl | Curl | affected 7.50.1 | Not specified |
| CNA | Curl | Curl | affected 7.50.0 | Not specified |
| CNA | Curl | Curl | affected 7.49.1 | Not specified |
| CNA | Curl | Curl | affected 7.49.0 | Not specified |
| CNA | Curl | Curl | affected 7.48.0 | Not specified |
| CNA | Curl | Curl | affected 7.47.1 | Not specified |
| CNA | Curl | Curl | affected 7.47.0 | Not specified |
| CNA | Curl | Curl | affected 7.46.0 | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| curl.se/docs/CVE-2026-82209.json | 2499f714-1537-4658-8207-48ae4bb9eae9 | curl.se | Vendor Advisory |
| hackerone.com/reports/3972385 | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | hackerone.com | Exploit, Mitigation, Third Party Advisory |
| curl.se/docs/CVE-2026-82209.html | 2499f714-1537-4658-8207-48ae4bb9eae9 | curl.se | Patch, Vendor Advisory |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Stanislav Fort (Aisle Research) (en)
CNA: Daniel Stenberg (en)
There are currently no legacy QID mappings associated with this CVE.