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CVE-2026-82209— domain-scoped PSL domain cookie

Quick assessment

Affected
curl curl
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

curl是瑞典curl团队开源的一款用于从服务器传输数据或向服务器传输数据的工具。 curl 7.46.0版本至8.21.0版本存在信息泄露漏洞，该漏洞源于启用libpsl支持时，处理Set-Cookie标头中Domain属性为公共后缀（如co.uk）的内容时未正确执行公共后缀列表边界检查，导致Cookie被存储为通配符域范围（.co.uk），可能被错误发送到同一公共后缀下的任意兄弟子域（如attacker.co.uk），造成Cookie意外泄露或未授权使用。

AI Predicted 7.1 Difficulty: Moderate EPSS 0.54% · P44

Affected Version Matrix 101

VendorProduct Version RangeStatus
curl curl 7.46.0< 8.14.2 affected
8.15.0< 8.16.1 affected
8.17.0< 8.20.1 affected
8.21.0< 8.22.0 affected
e77b5b7453c1e8ccd7ec0816890d98e2f392e465< 95c1e8915dce64606bd753fd47fc0bd236e31cd6 affected
8.21.0 affected
8.20.0 affected
8.19.0 affected
… +93 more rows
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I. Basic Information for CVE-2026-82209

Vulnerability Information
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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
domain-scoped PSL domain cookie
Source: CVE Program / CVE List V5
Vulnerability 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`).
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
通过发送数据的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
curl 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
curl是瑞典curl团队开源的一款用于从服务器传输数据或向服务器传输数据的工具。 curl 7.46.0版本至8.21.0版本存在信息泄露漏洞，该漏洞源于启用libpsl支持时，处理Set-Cookie标头中Domain属性为公共后缀（如co.uk）的内容时未正确执行公共后缀列表边界检查，导致Cookie被存储为通配符域范围（.co.uk），可能被错误发送到同一公共后缀下的任意兄弟子域（如attacker.co.uk），造成Cookie意外泄露或未授权使用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
curl curl 7.46.0 ~ 8.14.2 -
curl curl e77b5b7453c1e8ccd7ec0816890d98e2f392e465 ~ 95c1e8915dce64606bd753fd47fc0bd236e31cd6 -
curl curl 8.21.0 -

II. Public POCs for CVE-2026-82209

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III. Intelligence Information for CVE-2026-82209

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Vendor Advisories for CVE-2026-82209 (2)

Other References for CVE-2026-82209 (1)

Same Patch Batch · curl · 2026-09-06 · 9 CVEs total

CVE-2026-82208 wolfSSL CA-cache hit overrides callback
CVE-2026-18924 HTTP/2 server push UAF
CVE-2026-19931 Negotiate ambient user conn reuse
CVE-2026-80231 native CA store conn reuse
CVE-2026-80229 OpenSSL provider use-after-free
CVE-2026-80230 OpenSSL pinning bypass
CVE-2026-80255 secure cookie attribute bypass with tab
CVE-2026-13608 OpenLDAP SASL authentication bypass

IV. Related Vulnerabilities

Same product: curl
Same vendor: curl
Same weakness: CWE-201

V. Comments for CVE-2026-82209

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