---
cve: "CVE-2026-82209"
severity: "LOW"
cvss: 3.1
epss: "5.6%"
vendor: "Generic Security"
kev: false
exploited: false
published: "2026-09-06 18:17:22"
tags: [cve, security, low]
source: tsecurity.de CVE-Dossier
exported: "2026-09-07T00:35:31+02:00"
---

# CVE-2026-82209

> 3.1 LOW

## Beschreibung

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`).

## Referenzen

- <https://curl.se/docs/CVE-2026-82209.html>
- <https://curl.se/docs/CVE-2026-82209.json>
- <https://hackerone.com/reports/3972385>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-82209) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_