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SUSE-SU-2026:21440-1

Vulnerability from csaf_suse - Published: 2026-04-30 15:00 - Updated: 2026-09-19 15:40
Summary
Security update for curl
Severity
Important
Notes
Title of the patch: Security update for curl
Description of the patch: This update for curl fixes the following issues: Security issues fixed: - CVE-2026-4873: connection reuse ignores TLS requirement (bsc#1262631). - CVE-2026-5545: wrong reuse of HTTP Negotiate connection (bsc#1262632). - CVE-2026-6253: proxy credentials leak over redirect-to proxy (bsc#1262635). - CVE-2026-6276: stale custom cookie host causes cookie leak (bsc#1262636). - CVE-2026-6429: netrc credential leak with reused proxy connection (bsc#1262638). Other updates and bugfixes: - sws: prevent "connection monitor" to say disconnect twice (bsc#1259362).
Patchnames: SUSE-SLE-Micro-6.0-695,SUSE-SLE-Micro-6.1-508
Terms of use: CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).
CVE-2026-1965
7.5 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
Affected products
Product Identifier Version Remediation
Unresolved product id: SUSE Linux Micro 6.0:curl-0:8.14.1-6.1.s390x —
Vendor Fix
Unresolved product id: SUSE Linux Micro 6.0:curl-0:8.14.1-6.1.x86_64 —
Vendor Fix
Unresolved product id: SUSE Linux Micro 6.0:libcurl4-0:8.14.1-6.1.s390x —
Vendor Fix
Unresolved product id: SUSE Linux Micro 6.0:libcurl4-0:8.14.1-6.1.x86_64 —
Vendor Fix
Threats
Impact important
CVE-2026-4873
3.7 (Low)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Affected products
Recommended 4 products, the same list as for CVE-2026-1965
Threats
Impact low
CVE-2026-5545
6.5 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
Affected products
Recommended 4 products, the same list as for CVE-2026-1965
Threats
Impact moderate
CVE-2026-6253
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Affected products
Recommended 4 products, the same list as for CVE-2026-1965
Threats
Impact moderate
CVE-2026-6276
3.7 (Low)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Affected products
Recommended 4 products, the same list as for CVE-2026-1965
Threats
Impact low
CVE-2026-6429
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Affected products
Recommended 4 products, the same list as for CVE-2026-1965
Threats
Impact moderate
References
URL Category
https://www.suse.com/support/security/rating/ external
https://ftp.suse.com/pub/projects/security/csaf/s… self
https://www.suse.com/support/update/announcement/… self
https://lists.suse.com/pipermail/sle-security-upd… self
https://bugzilla.suse.com/1259362 self
https://bugzilla.suse.com/1262631 self
https://bugzilla.suse.com/1262632 self
https://bugzilla.suse.com/1262635 self
https://bugzilla.suse.com/1262636 self
https://bugzilla.suse.com/1262638 self
https://www.suse.com/security/cve/CVE-2026-1965/ self
https://www.suse.com/security/cve/CVE-2026-4873/ self
https://www.suse.com/security/cve/CVE-2026-5545/ self
https://www.suse.com/security/cve/CVE-2026-6253/ self
https://www.suse.com/security/cve/CVE-2026-6276/ self
https://www.suse.com/security/cve/CVE-2026-6429/ self
https://www.suse.com/security/cve/CVE-2026-1965 external
https://bugzilla.suse.com/1259362 external
https://bugzilla.suse.com/1262632 external
https://www.suse.com/security/cve/CVE-2026-4873 external
https://bugzilla.suse.com/1262631 external
https://www.suse.com/security/cve/CVE-2026-5545 external
https://bugzilla.suse.com/1262632 external
https://bugzilla.suse.com/1268407 external
https://www.suse.com/security/cve/CVE-2026-6253 external
https://bugzilla.suse.com/1262635 external
https://bugzilla.suse.com/1268299 external
https://www.suse.com/security/cve/CVE-2026-6276 external
https://bugzilla.suse.com/1262636 external
https://www.suse.com/security/cve/CVE-2026-6429 external
https://bugzilla.suse.com/1262638 external
To clipboard 

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  "vulnerabilities": [
    {
      "cve": "CVE-2026-1965",
      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2026-1965"
        }
      ],
      "notes": [
        {
          "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 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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          "SUSE Linux Micro 6.0:libcurl4-0:8.14.1-6.1.s390x",
          "SUSE Linux Micro 6.0:libcurl4-0:8.14.1-6.1.x86_64"
        ]
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          "summary": "CVE-2026-1965",
          "url": "https://www.suse.com/security/cve/CVE-2026-1965"
        },
        {
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          "summary": "SUSE Bug 1259362 for CVE-2026-1965",
          "url": "https://bugzilla.suse.com/1259362"
        },
        {
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          "summary": "SUSE Bug 1262632 for CVE-2026-1965",
          "url": "https://bugzilla.suse.com/1262632"
        }
      ],
      "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 Micro 6.0:curl-0:8.14.1-6.1.s390x",
            "SUSE Linux Micro 6.0:curl-0:8.14.1-6.1.x86_64",
            "SUSE Linux Micro 6.0:libcurl4-0:8.14.1-6.1.s390x",
            "SUSE Linux Micro 6.0:libcurl4-0:8.14.1-6.1.x86_64"
          ]
        }
      ],
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            "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"
          },
          "products": [
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            "SUSE Linux Micro 6.0:curl-0:8.14.1-6.1.x86_64",
            "SUSE Linux Micro 6.0:libcurl4-0:8.14.1-6.1.s390x",
            "SUSE Linux Micro 6.0:libcurl4-0:8.14.1-6.1.x86_64"
          ]
        }
      ],
      "threats": [
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          "date": "2026-04-30T15:00:06Z",
          "details": "important"
        }
      ],
      "title": "CVE-2026-1965"
    },
    {
      "cve": "CVE-2026-4873",
      "ids": [
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          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2026-4873"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "A vulnerability exists where a connection requiring TLS incorrectly reuses an\nexisting unencrypted connection from the same connection pool. If an initial\ntransfer is made in clear-text (via IMAP, SMTP, or POP3), a subsequent request\nto that same host bypasses the TLS requirement and instead transmit data\nunencrypted.",
          "title": "CVE description"
        }
      ],
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          "SUSE Linux Micro 6.0:libcurl4-0:8.14.1-6.1.s390x",
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      },
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        },
        {
          "category": "external",
          "summary": "SUSE Bug 1262631 for CVE-2026-4873",
          "url": "https://bugzilla.suse.com/1262631"
        }
      ],
      "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": [
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            "SUSE Linux Micro 6.0:libcurl4-0:8.14.1-6.1.s390x",
            "SUSE Linux Micro 6.0:libcurl4-0:8.14.1-6.1.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 3.7,
            "baseSeverity": "LOW",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
            "version": "3.1"
          },
          "products": [
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            "SUSE Linux Micro 6.0:curl-0:8.14.1-6.1.x86_64",
            "SUSE Linux Micro 6.0:libcurl4-0:8.14.1-6.1.s390x",
            "SUSE Linux Micro 6.0:libcurl4-0:8.14.1-6.1.x86_64"
          ]
        }
      ],
      "threats": [
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          "category": "impact",
          "date": "2026-04-30T15:00:06Z",
          "details": "low"
        }
      ],
      "title": "CVE-2026-4873"
    },
    {
      "cve": "CVE-2026-5545",
      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2026-5545"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "libcurl might in some circumstances reuse the wrong connection when asked to\ndo an authenticated HTTP(S) request after a Negotiate-authenticated one, when\nboth use the same host.\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 criteria must be met. Due to a logical\nerror 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.\n\nAn application that first uses Negotiate authentication to a server with\n`user1:password1` and then does another operation to the same server asking\nfor any authentication method but for `user2:password2` (while the previous\nconnection is still alive) - the second request gets confused and wrongly\nreuses the same connection and sends the new request over that connection\nthinking it uses a mix of user1\u0027s and user2\u0027s credentials when it is in fact\nstill using the connection authenticated for user1...",
          "title": "CVE description"
        }
      ],
      "product_status": {
        "recommended": [
          "SUSE Linux Micro 6.0:curl-0:8.14.1-6.1.s390x",
          "SUSE Linux Micro 6.0:curl-0:8.14.1-6.1.x86_64",
          "SUSE Linux Micro 6.0:libcurl4-0:8.14.1-6.1.s390x",
          "SUSE Linux Micro 6.0:libcurl4-0:8.14.1-6.1.x86_64"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "CVE-2026-5545",
          "url": "https://www.suse.com/security/cve/CVE-2026-5545"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1262632 for CVE-2026-5545",
          "url": "https://bugzilla.suse.com/1262632"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1268407 for CVE-2026-5545",
          "url": "https://bugzilla.suse.com/1268407"
        }
      ],
      "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 Micro 6.0:curl-0:8.14.1-6.1.s390x",
            "SUSE Linux Micro 6.0:curl-0:8.14.1-6.1.x86_64",
            "SUSE Linux Micro 6.0:libcurl4-0:8.14.1-6.1.s390x",
            "SUSE Linux Micro 6.0:libcurl4-0:8.14.1-6.1.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N",
            "version": "3.1"
          },
          "products": [
            "SUSE Linux Micro 6.0:curl-0:8.14.1-6.1.s390x",
            "SUSE Linux Micro 6.0:curl-0:8.14.1-6.1.x86_64",
            "SUSE Linux Micro 6.0:libcurl4-0:8.14.1-6.1.s390x",
            "SUSE Linux Micro 6.0:libcurl4-0:8.14.1-6.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-04-30T15:00:06Z",
          "details": "moderate"
        }
      ],
      "title": "CVE-2026-5545"
    },
    {
      "cve": "CVE-2026-6253",
      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2026-6253"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "curl might erroneously pass on credentials for a first proxy to a second\nproxy.\n\nThis can happen when the following conditions are true:\n\n1. curl is setup to use specific different proxies for different URL schemes\n2. the first proxy needs credentials\n3. the second proxy uses no credentials\n4. while using the first proxy (using say `http://`), curl is asked to follow\n   a redirect to a URL using another scheme (say `https://`), accessed using a\n   second, different, proxy",
          "title": "CVE description"
        }
      ],
      "product_status": {
        "recommended": [
          "SUSE Linux Micro 6.0:curl-0:8.14.1-6.1.s390x",
          "SUSE Linux Micro 6.0:curl-0:8.14.1-6.1.x86_64",
          "SUSE Linux Micro 6.0:libcurl4-0:8.14.1-6.1.s390x",
          "SUSE Linux Micro 6.0:libcurl4-0:8.14.1-6.1.x86_64"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "CVE-2026-6253",
          "url": "https://www.suse.com/security/cve/CVE-2026-6253"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1262635 for CVE-2026-6253",
          "url": "https://bugzilla.suse.com/1262635"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1268299 for CVE-2026-6253",
          "url": "https://bugzilla.suse.com/1268299"
        }
      ],
      "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 Micro 6.0:curl-0:8.14.1-6.1.s390x",
            "SUSE Linux Micro 6.0:curl-0:8.14.1-6.1.x86_64",
            "SUSE Linux Micro 6.0:libcurl4-0:8.14.1-6.1.s390x",
            "SUSE Linux Micro 6.0:libcurl4-0:8.14.1-6.1.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
          "products": [
            "SUSE Linux Micro 6.0:curl-0:8.14.1-6.1.s390x",
            "SUSE Linux Micro 6.0:curl-0:8.14.1-6.1.x86_64",
            "SUSE Linux Micro 6.0:libcurl4-0:8.14.1-6.1.s390x",
            "SUSE Linux Micro 6.0:libcurl4-0:8.14.1-6.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-04-30T15:00:06Z",
          "details": "moderate"
        }
      ],
      "title": "CVE-2026-6253"
    },
    {
      "cve": "CVE-2026-6276",
      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2026-6276"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "Using libcurl, when a custom `Host:` header is first set for an HTTP request\nand a second request is subsequently done using the same *easy handle* but\nwithout the custom `Host:` header set, the second request would use stale\ninformation and pass on cookies meant for the first host in the second\nrequest. Leak them.",
          "title": "CVE description"
        }
      ],
      "product_status": {
        "recommended": [
          "SUSE Linux Micro 6.0:curl-0:8.14.1-6.1.s390x",
          "SUSE Linux Micro 6.0:curl-0:8.14.1-6.1.x86_64",
          "SUSE Linux Micro 6.0:libcurl4-0:8.14.1-6.1.s390x",
          "SUSE Linux Micro 6.0:libcurl4-0:8.14.1-6.1.x86_64"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "CVE-2026-6276",
          "url": "https://www.suse.com/security/cve/CVE-2026-6276"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1262636 for CVE-2026-6276",
          "url": "https://bugzilla.suse.com/1262636"
        }
      ],
      "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 Micro 6.0:curl-0:8.14.1-6.1.s390x",
            "SUSE Linux Micro 6.0:curl-0:8.14.1-6.1.x86_64",
            "SUSE Linux Micro 6.0:libcurl4-0:8.14.1-6.1.s390x",
            "SUSE Linux Micro 6.0:libcurl4-0:8.14.1-6.1.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 3.7,
            "baseSeverity": "LOW",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
            "version": "3.1"
          },
          "products": [
            "SUSE Linux Micro 6.0:curl-0:8.14.1-6.1.s390x",
            "SUSE Linux Micro 6.0:curl-0:8.14.1-6.1.x86_64",
            "SUSE Linux Micro 6.0:libcurl4-0:8.14.1-6.1.s390x",
            "SUSE Linux Micro 6.0:libcurl4-0:8.14.1-6.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-04-30T15:00:06Z",
          "details": "low"
        }
      ],
      "title": "CVE-2026-6276"
    },
    {
      "cve": "CVE-2026-6429",
      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2026-6429"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "When asked to both use a `.netrc` file for credentials and to follow HTTP\nredirects, libcurl could leak the password used for the first host to the\nfollowed-to host under certain circumstances.",
          "title": "CVE description"
        }
      ],
      "product_status": {
        "recommended": [
          "SUSE Linux Micro 6.0:curl-0:8.14.1-6.1.s390x",
          "SUSE Linux Micro 6.0:curl-0:8.14.1-6.1.x86_64",
          "SUSE Linux Micro 6.0:libcurl4-0:8.14.1-6.1.s390x",
          "SUSE Linux Micro 6.0:libcurl4-0:8.14.1-6.1.x86_64"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "CVE-2026-6429",
          "url": "https://www.suse.com/security/cve/CVE-2026-6429"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1262638 for CVE-2026-6429",
          "url": "https://bugzilla.suse.com/1262638"
        }
      ],
      "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 Micro 6.0:curl-0:8.14.1-6.1.s390x",
            "SUSE Linux Micro 6.0:curl-0:8.14.1-6.1.x86_64",
            "SUSE Linux Micro 6.0:libcurl4-0:8.14.1-6.1.s390x",
            "SUSE Linux Micro 6.0:libcurl4-0:8.14.1-6.1.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
          "products": [
            "SUSE Linux Micro 6.0:curl-0:8.14.1-6.1.s390x",
            "SUSE Linux Micro 6.0:curl-0:8.14.1-6.1.x86_64",
            "SUSE Linux Micro 6.0:libcurl4-0:8.14.1-6.1.s390x",
            "SUSE Linux Micro 6.0:libcurl4-0:8.14.1-6.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-04-30T15:00:06Z",
          "details": "moderate"
        }
      ],
      "title": "CVE-2026-6429"
    }
  ]
}



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Tags
Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.