OESA-2026-2984 (CVE-2026-8286)

Vulnerability from osv_openeuler – Published: 2026-07-19 11:11 – Updated: 2026-08-06 11:11 – Source website
VLAI
Summary
curl security update
Details

cURL is a computer software project providing a library (libcurl) and command-line tool (curl) for transferring data using various protocols.

Security Fix(es):

A vulnerability exists where a new transfer that uses STARTTLS to upgrade the connection might reuse an existing live connection even though the TLS configuration mismatches so it should not.(CVE-2026-8286)

A flaw in curl’s cookie parsing logic allows a malicious HTTP server to set 'super cookies' that bypass the Public Suffix List check. This enables an attacker-controlled origin to inject cookies that curl subsequently scopes and transmits to unrelated third-party domains.(CVE-2026-8924)

When reusing a libcurl handle for sequential transfers driven by environment-variable proxy configuration, libcurl fails to clear the proxy authentication state between requests. Specifically, if the initial transfer authenticates against proxyA using Digest auth, a subsequent transfer routed through proxyB erroneously leaks the Proxy-Authorization: header intended solely for proxyA.(CVE-2026-8927)

When a libcurl-based application performs transfers via SCP:// or SFTP:// and utilizes the CURLOPT_SSH_KEYFUNCTION callback, it may silently accept an untrusted server. This vulnerability occurs when a server presents a host key type that does not match the specific key type already recorded for that host in the known_hosts file. Instead of rejecting the mismatch, the callback mechanism fails to properly enforce the restriction, allowing the connection to succeed without warning and risking a potential man-in-the-middle attack.(CVE-2026-9547)

Severity
8.1 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "curl-7.71.1-50.oe2003sp4.aarch64.rpm",
          "curl-debuginfo-7.71.1-50.oe2003sp4.aarch64.rpm",
          "curl-debugsource-7.71.1-50.oe2003sp4.aarch64.rpm",
          "libcurl-7.71.1-50.oe2003sp4.aarch64.rpm",
          "libcurl-devel-7.71.1-50.oe2003sp4.aarch64.rpm"
        ],
        "noarch": [
          "curl-help-7.71.1-50.oe2003sp4.noarch.rpm"
        ],
        "src": [
          "curl-7.71.1-50.oe2003sp4.src.rpm"
        ],
        "x86_64": [
          "curl-7.71.1-50.oe2003sp4.x86_64.rpm",
          "curl-debuginfo-7.71.1-50.oe2003sp4.x86_64.rpm",
          "curl-debugsource-7.71.1-50.oe2003sp4.x86_64.rpm",
          "libcurl-7.71.1-50.oe2003sp4.x86_64.rpm",
          "libcurl-devel-7.71.1-50.oe2003sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP4",
        "name": "curl",
        "purl": "pkg:rpm/openEuler/curl\u0026distro=openEuler-20.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.71.1-50.oe2003sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "High"
  },
  "details": "cURL is a computer software project providing a library (libcurl) and command-line tool (curl) for transferring data using various protocols.\r\n\r\nSecurity Fix(es):\n\nA vulnerability exists where a new transfer that uses STARTTLS to upgrade the\nconnection might reuse an existing live connection even though the TLS\nconfiguration mismatches so it should not.(CVE-2026-8286)\n\nA flaw in curl\u2019s cookie parsing logic allows a malicious HTTP server to set\n\u0026apos;super cookies\u0026apos; that bypass the Public Suffix List check. This enables an\nattacker-controlled origin to inject cookies that curl subsequently scopes and\ntransmits to unrelated third-party domains.(CVE-2026-8924)\n\nWhen reusing a libcurl handle for sequential transfers driven by\nenvironment-variable proxy configuration, libcurl fails to clear the proxy\nauthentication state between requests. Specifically, if the initial transfer\nauthenticates against `proxyA` using Digest auth, a subsequent transfer routed\nthrough `proxyB` erroneously leaks the `Proxy-Authorization:` header intended\nsolely for `proxyA`.(CVE-2026-8927)\n\nWhen a libcurl-based application performs transfers via `SCP://` or `SFTP://`\nand utilizes the `CURLOPT_SSH_KEYFUNCTION` callback, it may silently accept an\nuntrusted server. This vulnerability occurs when a server presents a host key\ntype that does not match the specific key type already recorded for that host\nin the `known_hosts` file. Instead of rejecting the mismatch, the callback\nmechanism fails to properly enforce the restriction, allowing the connection\nto succeed without warning and risking a potential man-in-the-middle attack.(CVE-2026-9547)",
  "id": "OESA-2026-2984",
  "modified": "2026-08-06T11:11:53Z",
  "published": "2026-07-19T11:11:53Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2984"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-8286"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-8924"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-8927"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-9547"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "curl security update",
  "upstream": [
    "CVE-2026-8286",
    "CVE-2026-8924",
    "CVE-2026-8927",
    "CVE-2026-9547"
  ]
}



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