SUSE-SU-2026:0879-1

Vulnerability from csaf_suse - Published: 2026-03-12 10:04 - Updated: 2026-03-12 10:04
Summary
Security update for curl

Notes

Title of the patch
Security update for curl
Description of the patch
This update for curl fixes the following issues: - CVE-2026-1965: bad reuse of HTTP Negotiate connection (bsc#1259362). - CVE-2026-3783: token leak with redirect and netrc (bsc#1259363). - CVE-2026-3784: wrong proxy connection reuse with credentials (bsc#1259364). - CVE-2026-3805: use after free in SMB connection reuse (bsc#1259365).
Patchnames
SUSE-2026-879,SUSE-SUSE-MicroOS-5.2-2026-879
Terms of use
CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).
To clipboard 

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  "vulnerabilities": [
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      "cve": "CVE-2026-1965",
      "ids": [
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          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2026-1965"
        }
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          "category": "general",
          "text": "libcurl can in some circumstances reuse the wrong connection when asked to do\nan Negotiate-authenticated HTTP or HTTPS request.\n\nlibcurl features a pool of recent connections so that subsequent requests can\nreuse an existing connection to avoid overhead.\n\nWhen reusing a connection a range of criterion must first be met. Due to a\nlogical error in the code, a request that was issued by an application could\nwrongfully reuse an existing connection to the same server that was\nauthenticated using different credentials. One underlying reason being that\nNegotiate sometimes authenticates *connections* and not *requests*, contrary\nto how HTTP is designed to work.\n\nAn application that allows Negotiate authentication to a server (that responds\nwanting Negotiate) with `user1:password1` and then does another operation to\nthe same server also using Negotiate but with `user2:password2` (while the\nprevious connection is still alive) - the second request wrongly reused the\nsame connection and since it then sees that the Negotiate negotiation is\nalready made, it just sends the request over that connection thinking it uses\nthe user2 credentials when it is in fact still using the connection\nauthenticated for user1...\n\nThe set of authentication methods to use is set with  `CURLOPT_HTTPAUTH`.\n\nApplications can disable libcurl\u0027s reuse of connections and thus mitigate this\nproblem, by using one of the following libcurl options to alter how\nconnections are or are not reused: `CURLOPT_FRESH_CONNECT`,\n`CURLOPT_MAXCONNECTS` and `CURLMOPT_MAX_HOST_CONNECTIONS` (if using the\ncurl_multi API).",
          "title": "CVE description"
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          "summary": "SUSE Bug 1259362 for CVE-2026-1965",
          "url": "https://bugzilla.suse.com/1259362"
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          "category": "vendor_fix",
          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
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            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N",
            "version": "3.1"
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          "products": [
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            "SUSE Linux Enterprise Micro 5.2:curl-8.14.1-150200.4.103.1.s390x",
            "SUSE Linux Enterprise Micro 5.2:curl-8.14.1-150200.4.103.1.x86_64",
            "SUSE Linux Enterprise Micro 5.2:libcurl4-8.14.1-150200.4.103.1.aarch64",
            "SUSE Linux Enterprise Micro 5.2:libcurl4-8.14.1-150200.4.103.1.s390x",
            "SUSE Linux Enterprise Micro 5.2:libcurl4-8.14.1-150200.4.103.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-03-12T10:04:20Z",
          "details": "important"
        }
      ],
      "title": "CVE-2026-1965"
    },
    {
      "cve": "CVE-2026-3783",
      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2026-3783"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "When an OAuth2 bearer token is used for an HTTP(S) transfer, and that transfer\nperforms a redirect to a second URL, curl could leak that token to the second\nhostname under some circumstances.\n\nIf the hostname that the first request is redirected to has information in the\nused .netrc file, with either of the `machine` or `default` keywords, curl\nwould pass on the bearer token set for the first host also to the second one.",
          "title": "CVE description"
        }
      ],
      "product_status": {
        "recommended": [
          "SUSE Linux Enterprise Micro 5.2:curl-8.14.1-150200.4.103.1.aarch64",
          "SUSE Linux Enterprise Micro 5.2:curl-8.14.1-150200.4.103.1.s390x",
          "SUSE Linux Enterprise Micro 5.2:curl-8.14.1-150200.4.103.1.x86_64",
          "SUSE Linux Enterprise Micro 5.2:libcurl4-8.14.1-150200.4.103.1.aarch64",
          "SUSE Linux Enterprise Micro 5.2:libcurl4-8.14.1-150200.4.103.1.s390x",
          "SUSE Linux Enterprise Micro 5.2:libcurl4-8.14.1-150200.4.103.1.x86_64"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "CVE-2026-3783",
          "url": "https://www.suse.com/security/cve/CVE-2026-3783"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1259363 for CVE-2026-3783",
          "url": "https://bugzilla.suse.com/1259363"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
          "product_ids": [
            "SUSE Linux Enterprise Micro 5.2:curl-8.14.1-150200.4.103.1.aarch64",
            "SUSE Linux Enterprise Micro 5.2:curl-8.14.1-150200.4.103.1.s390x",
            "SUSE Linux Enterprise Micro 5.2:curl-8.14.1-150200.4.103.1.x86_64",
            "SUSE Linux Enterprise Micro 5.2:libcurl4-8.14.1-150200.4.103.1.aarch64",
            "SUSE Linux Enterprise Micro 5.2:libcurl4-8.14.1-150200.4.103.1.s390x",
            "SUSE Linux Enterprise Micro 5.2:libcurl4-8.14.1-150200.4.103.1.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 4.7,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
          "products": [
            "SUSE Linux Enterprise Micro 5.2:curl-8.14.1-150200.4.103.1.aarch64",
            "SUSE Linux Enterprise Micro 5.2:curl-8.14.1-150200.4.103.1.s390x",
            "SUSE Linux Enterprise Micro 5.2:curl-8.14.1-150200.4.103.1.x86_64",
            "SUSE Linux Enterprise Micro 5.2:libcurl4-8.14.1-150200.4.103.1.aarch64",
            "SUSE Linux Enterprise Micro 5.2:libcurl4-8.14.1-150200.4.103.1.s390x",
            "SUSE Linux Enterprise Micro 5.2:libcurl4-8.14.1-150200.4.103.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-03-12T10:04:20Z",
          "details": "moderate"
        }
      ],
      "title": "CVE-2026-3783"
    },
    {
      "cve": "CVE-2026-3784",
      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2026-3784"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "curl would wrongly reuse an existing HTTP proxy connection doing CONNECT to a\nserver, even if the new request uses different credentials for the HTTP proxy.\nThe proper behavior is to create or use a separate connection.",
          "title": "CVE description"
        }
      ],
      "product_status": {
        "recommended": [
          "SUSE Linux Enterprise Micro 5.2:curl-8.14.1-150200.4.103.1.aarch64",
          "SUSE Linux Enterprise Micro 5.2:curl-8.14.1-150200.4.103.1.s390x",
          "SUSE Linux Enterprise Micro 5.2:curl-8.14.1-150200.4.103.1.x86_64",
          "SUSE Linux Enterprise Micro 5.2:libcurl4-8.14.1-150200.4.103.1.aarch64",
          "SUSE Linux Enterprise Micro 5.2:libcurl4-8.14.1-150200.4.103.1.s390x",
          "SUSE Linux Enterprise Micro 5.2:libcurl4-8.14.1-150200.4.103.1.x86_64"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "CVE-2026-3784",
          "url": "https://www.suse.com/security/cve/CVE-2026-3784"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1259364 for CVE-2026-3784",
          "url": "https://bugzilla.suse.com/1259364"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
          "product_ids": [
            "SUSE Linux Enterprise Micro 5.2:curl-8.14.1-150200.4.103.1.aarch64",
            "SUSE Linux Enterprise Micro 5.2:curl-8.14.1-150200.4.103.1.s390x",
            "SUSE Linux Enterprise Micro 5.2:curl-8.14.1-150200.4.103.1.x86_64",
            "SUSE Linux Enterprise Micro 5.2:libcurl4-8.14.1-150200.4.103.1.aarch64",
            "SUSE Linux Enterprise Micro 5.2:libcurl4-8.14.1-150200.4.103.1.s390x",
            "SUSE Linux Enterprise Micro 5.2:libcurl4-8.14.1-150200.4.103.1.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 4.6,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N",
            "version": "3.1"
          },
          "products": [
            "SUSE Linux Enterprise Micro 5.2:curl-8.14.1-150200.4.103.1.aarch64",
            "SUSE Linux Enterprise Micro 5.2:curl-8.14.1-150200.4.103.1.s390x",
            "SUSE Linux Enterprise Micro 5.2:curl-8.14.1-150200.4.103.1.x86_64",
            "SUSE Linux Enterprise Micro 5.2:libcurl4-8.14.1-150200.4.103.1.aarch64",
            "SUSE Linux Enterprise Micro 5.2:libcurl4-8.14.1-150200.4.103.1.s390x",
            "SUSE Linux Enterprise Micro 5.2:libcurl4-8.14.1-150200.4.103.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-03-12T10:04:20Z",
          "details": "moderate"
        }
      ],
      "title": "CVE-2026-3784"
    },
    {
      "cve": "CVE-2026-3805",
      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2026-3805"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "When doing a second SMB request to the same host again, curl would wrongly use\na data pointer pointing into already freed memory.",
          "title": "CVE description"
        }
      ],
      "product_status": {
        "recommended": [
          "SUSE Linux Enterprise Micro 5.2:curl-8.14.1-150200.4.103.1.aarch64",
          "SUSE Linux Enterprise Micro 5.2:curl-8.14.1-150200.4.103.1.s390x",
          "SUSE Linux Enterprise Micro 5.2:curl-8.14.1-150200.4.103.1.x86_64",
          "SUSE Linux Enterprise Micro 5.2:libcurl4-8.14.1-150200.4.103.1.aarch64",
          "SUSE Linux Enterprise Micro 5.2:libcurl4-8.14.1-150200.4.103.1.s390x",
          "SUSE Linux Enterprise Micro 5.2:libcurl4-8.14.1-150200.4.103.1.x86_64"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "CVE-2026-3805",
          "url": "https://www.suse.com/security/cve/CVE-2026-3805"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1259365 for CVE-2026-3805",
          "url": "https://bugzilla.suse.com/1259365"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
          "product_ids": [
            "SUSE Linux Enterprise Micro 5.2:curl-8.14.1-150200.4.103.1.aarch64",
            "SUSE Linux Enterprise Micro 5.2:curl-8.14.1-150200.4.103.1.s390x",
            "SUSE Linux Enterprise Micro 5.2:curl-8.14.1-150200.4.103.1.x86_64",
            "SUSE Linux Enterprise Micro 5.2:libcurl4-8.14.1-150200.4.103.1.aarch64",
            "SUSE Linux Enterprise Micro 5.2:libcurl4-8.14.1-150200.4.103.1.s390x",
            "SUSE Linux Enterprise Micro 5.2:libcurl4-8.14.1-150200.4.103.1.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 2.5,
            "baseSeverity": "LOW",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N",
            "version": "3.1"
          },
          "products": [
            "SUSE Linux Enterprise Micro 5.2:curl-8.14.1-150200.4.103.1.aarch64",
            "SUSE Linux Enterprise Micro 5.2:curl-8.14.1-150200.4.103.1.s390x",
            "SUSE Linux Enterprise Micro 5.2:curl-8.14.1-150200.4.103.1.x86_64",
            "SUSE Linux Enterprise Micro 5.2:libcurl4-8.14.1-150200.4.103.1.aarch64",
            "SUSE Linux Enterprise Micro 5.2:libcurl4-8.14.1-150200.4.103.1.s390x",
            "SUSE Linux Enterprise Micro 5.2:libcurl4-8.14.1-150200.4.103.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-03-12T10:04:20Z",
          "details": "moderate"
        }
      ],
      "title": "CVE-2026-3805"
    }
  ]
}


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Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

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.



Detection rules are retrieved from Rulezet.