ubuntu-cve-2026-82209
Vulnerability from osv_ubuntu
Published
2026-09-02 00:00
Modified
2026-09-11 00:21
Summary
Details
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).
Severity
8.2 (High)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "curl",
"binary_version": "7.47.0-1ubuntu2.19+esm18"
},
{
"binary_name": "libcurl3",
"binary_version": "7.47.0-1ubuntu2.19+esm18"
},
{
"binary_name": "libcurl3-gnutls",
"binary_version": "7.47.0-1ubuntu2.19+esm18"
},
{
"binary_name": "libcurl3-nss",
"binary_version": "7.47.0-1ubuntu2.19+esm18"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "curl",
"purl": "pkg:deb/ubuntu/curl@7.47.0-1ubuntu2.19+esm18?arch=source\u0026distro=esm-infra-legacy/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"7.43.0-1ubuntu2",
"7.45.0-1ubuntu1",
"7.46.0-1ubuntu1",
"7.47.0-1ubuntu1",
"7.47.0-1ubuntu2",
"7.47.0-1ubuntu2.1",
"7.47.0-1ubuntu2.2",
"7.47.0-1ubuntu2.3",
"7.47.0-1ubuntu2.4",
"7.47.0-1ubuntu2.5",
"7.47.0-1ubuntu2.6",
"7.47.0-1ubuntu2.7",
"7.47.0-1ubuntu2.8",
"7.47.0-1ubuntu2.9",
"7.47.0-1ubuntu2.11",
"7.47.0-1ubuntu2.12",
"7.47.0-1ubuntu2.13",
"7.47.0-1ubuntu2.14",
"7.47.0-1ubuntu2.15",
"7.47.0-1ubuntu2.16",
"7.47.0-1ubuntu2.18",
"7.47.0-1ubuntu2.19",
"7.47.0-1ubuntu2.19+esm1",
"7.47.0-1ubuntu2.19+esm2",
"7.47.0-1ubuntu2.19+esm3",
"7.47.0-1ubuntu2.19+esm4",
"7.47.0-1ubuntu2.19+esm5",
"7.47.0-1ubuntu2.19+esm6",
"7.47.0-1ubuntu2.19+esm7",
"7.47.0-1ubuntu2.19+esm8",
"7.47.0-1ubuntu2.19+esm9",
"7.47.0-1ubuntu2.19+esm10",
"7.47.0-1ubuntu2.19+esm11",
"7.47.0-1ubuntu2.19+esm12",
"7.47.0-1ubuntu2.19+esm13",
"7.47.0-1ubuntu2.19+esm15",
"7.47.0-1ubuntu2.19+esm16",
"7.47.0-1ubuntu2.19+esm17",
"7.47.0-1ubuntu2.19+esm18"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "curl",
"binary_version": "7.58.0-2ubuntu3.24+esm12"
},
{
"binary_name": "libcurl3-gnutls",
"binary_version": "7.58.0-2ubuntu3.24+esm12"
},
{
"binary_name": "libcurl3-nss",
"binary_version": "7.58.0-2ubuntu3.24+esm12"
},
{
"binary_name": "libcurl4",
"binary_version": "7.58.0-2ubuntu3.24+esm12"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "curl",
"purl": "pkg:deb/ubuntu/curl@7.58.0-2ubuntu3.24+esm12?arch=source\u0026distro=esm-infra/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"7.55.1-1ubuntu2",
"7.55.1-1ubuntu2.1",
"7.57.0-1ubuntu1",
"7.58.0-2ubuntu1",
"7.58.0-2ubuntu2",
"7.58.0-2ubuntu3",
"7.58.0-2ubuntu3.1",
"7.58.0-2ubuntu3.2",
"7.58.0-2ubuntu3.3",
"7.58.0-2ubuntu3.5",
"7.58.0-2ubuntu3.6",
"7.58.0-2ubuntu3.7",
"7.58.0-2ubuntu3.8",
"7.58.0-2ubuntu3.9",
"7.58.0-2ubuntu3.10",
"7.58.0-2ubuntu3.12",
"7.58.0-2ubuntu3.13",
"7.58.0-2ubuntu3.14",
"7.58.0-2ubuntu3.15",
"7.58.0-2ubuntu3.16",
"7.58.0-2ubuntu3.17",
"7.58.0-2ubuntu3.18",
"7.58.0-2ubuntu3.19",
"7.58.0-2ubuntu3.20",
"7.58.0-2ubuntu3.21",
"7.58.0-2ubuntu3.22",
"7.58.0-2ubuntu3.23",
"7.58.0-2ubuntu3.24",
"7.58.0-2ubuntu3.24+esm1",
"7.58.0-2ubuntu3.24+esm2",
"7.58.0-2ubuntu3.24+esm3",
"7.58.0-2ubuntu3.24+esm4",
"7.58.0-2ubuntu3.24+esm5",
"7.58.0-2ubuntu3.24+esm7",
"7.58.0-2ubuntu3.24+esm8",
"7.58.0-2ubuntu3.24+esm9",
"7.58.0-2ubuntu3.24+esm10",
"7.58.0-2ubuntu3.24+esm11",
"7.58.0-2ubuntu3.24+esm12"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "curl",
"binary_version": "7.68.0-1ubuntu2.25+esm7"
},
{
"binary_name": "libcurl3-gnutls",
"binary_version": "7.68.0-1ubuntu2.25+esm7"
},
{
"binary_name": "libcurl3-nss",
"binary_version": "7.68.0-1ubuntu2.25+esm7"
},
{
"binary_name": "libcurl4",
"binary_version": "7.68.0-1ubuntu2.25+esm7"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:20.04:LTS",
"name": "curl",
"purl": "pkg:deb/ubuntu/curl@7.68.0-1ubuntu2.25+esm7?arch=source\u0026distro=esm-infra/focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"7.65.3-1ubuntu3",
"7.65.3-1ubuntu4",
"7.66.0-1ubuntu1",
"7.67.0-2ubuntu1",
"7.68.0-1ubuntu1",
"7.68.0-1ubuntu2",
"7.68.0-1ubuntu2.1",
"7.68.0-1ubuntu2.2",
"7.68.0-1ubuntu2.4",
"7.68.0-1ubuntu2.5",
"7.68.0-1ubuntu2.6",
"7.68.0-1ubuntu2.7",
"7.68.0-1ubuntu2.10",
"7.68.0-1ubuntu2.11",
"7.68.0-1ubuntu2.12",
"7.68.0-1ubuntu2.13",
"7.68.0-1ubuntu2.14",
"7.68.0-1ubuntu2.15",
"7.68.0-1ubuntu2.16",
"7.68.0-1ubuntu2.18",
"7.68.0-1ubuntu2.19",
"7.68.0-1ubuntu2.20",
"7.68.0-1ubuntu2.21",
"7.68.0-1ubuntu2.22",
"7.68.0-1ubuntu2.23",
"7.68.0-1ubuntu2.24",
"7.68.0-1ubuntu2.25",
"7.68.0-1ubuntu2.25+esm2",
"7.68.0-1ubuntu2.25+esm3",
"7.68.0-1ubuntu2.25+esm4",
"7.68.0-1ubuntu2.25+esm5",
"7.68.0-1ubuntu2.25+esm6",
"7.68.0-1ubuntu2.25+esm7"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "curl",
"binary_version": "7.81.0-1ubuntu1.27"
},
{
"binary_name": "libcurl3-gnutls",
"binary_version": "7.81.0-1ubuntu1.27"
},
{
"binary_name": "libcurl3-nss",
"binary_version": "7.81.0-1ubuntu1.27"
},
{
"binary_name": "libcurl4",
"binary_version": "7.81.0-1ubuntu1.27"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "curl",
"purl": "pkg:deb/ubuntu/curl@7.81.0-1ubuntu1.27?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"7.74.0-1.3ubuntu2",
"7.74.0-1.3ubuntu3",
"7.80.0-3",
"7.81.0-1",
"7.81.0-1ubuntu1.1",
"7.81.0-1ubuntu1.2",
"7.81.0-1ubuntu1.3",
"7.81.0-1ubuntu1.4",
"7.81.0-1ubuntu1.6",
"7.81.0-1ubuntu1.7",
"7.81.0-1ubuntu1.8",
"7.81.0-1ubuntu1.10",
"7.81.0-1ubuntu1.11",
"7.81.0-1ubuntu1.13",
"7.81.0-1ubuntu1.14",
"7.81.0-1ubuntu1.15",
"7.81.0-1ubuntu1.16",
"7.81.0-1ubuntu1.17",
"7.81.0-1ubuntu1.18",
"7.81.0-1ubuntu1.19",
"7.81.0-1ubuntu1.20",
"7.81.0-1ubuntu1.21",
"7.81.0-1ubuntu1.22",
"7.81.0-1ubuntu1.23",
"7.81.0-1ubuntu1.24",
"7.81.0-1ubuntu1.25",
"7.81.0-1ubuntu1.26",
"7.81.0-1ubuntu1.27"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "curl",
"binary_version": "8.5.0-2ubuntu10.13"
},
{
"binary_name": "libcurl3t64-gnutls",
"binary_version": "8.5.0-2ubuntu10.13"
},
{
"binary_name": "libcurl4t64",
"binary_version": "8.5.0-2ubuntu10.13"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "curl",
"purl": "pkg:deb/ubuntu/curl@8.5.0-2ubuntu10.13?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"8.2.1-1ubuntu3",
"8.2.1-1ubuntu3.1",
"8.4.0-2ubuntu1",
"8.5.0-2ubuntu1",
"8.5.0-2ubuntu2",
"8.5.0-2ubuntu8",
"8.5.0-2ubuntu9",
"8.5.0-2ubuntu10",
"8.5.0-2ubuntu10.1",
"8.5.0-2ubuntu10.2",
"8.5.0-2ubuntu10.3",
"8.5.0-2ubuntu10.4",
"8.5.0-2ubuntu10.5",
"8.5.0-2ubuntu10.6",
"8.5.0-2ubuntu10.7",
"8.5.0-2ubuntu10.8",
"8.5.0-2ubuntu10.9",
"8.5.0-2ubuntu10.10",
"8.5.0-2ubuntu10.11",
"8.5.0-2ubuntu10.12",
"8.5.0-2ubuntu10.13"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "curl",
"binary_version": "8.18.0-1ubuntu2.5"
},
{
"binary_name": "libcurl3t64-gnutls",
"binary_version": "8.18.0-1ubuntu2.5"
},
{
"binary_name": "libcurl4t64",
"binary_version": "8.18.0-1ubuntu2.5"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "curl",
"purl": "pkg:deb/ubuntu/curl@8.18.0-1ubuntu2.5?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"8.14.1-2ubuntu1",
"8.17.0-1ubuntu1",
"8.18.0-1ubuntu1",
"8.18.0-1ubuntu2",
"8.18.0-1ubuntu2.1",
"8.18.0-1ubuntu2.2",
"8.18.0-1ubuntu2.3",
"8.18.0-1ubuntu2.4",
"8.18.0-1ubuntu2.5"
]
}
],
"aliases": [],
"details": "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`).",
"id": "UBUNTU-CVE-2026-82209",
"modified": "2026-09-11T00:21:48Z",
"published": "2026-09-02T00:00:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-82209"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-82209"
},
{
"type": "REPORT",
"url": "https://curl.se/docs/CVE-2026-82209.html"
},
{
"type": "REPORT",
"url": "https://github.com/curl/curl/commit/95c1e8915dce64606bd753fd47f"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-82209"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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