Vulnerability-Lookup

CVE-2026-15370 (GCVE-0-2026-15370)

Vulnerability from cvelistv5 – Published: 2026-07-21 09:07 – Updated: 2026-08-17 21:54

Title

Libssh: libssh: stack buffer overflow in sftp server longname construction

Summary

A flaw was found in libssh. During SFTP server directory listing, the longname field is constructed with unsafe concatenation into a fixed-size stack buffer. When a client causes the server to list attacker-controlled filenames, sufficiently long names can overflow that stack buffer and may lead to crashes or possible code execution on the server.

Severity

6.7 (Medium)


                        
                          CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-22 17:49 UTC

CWE

CWE-121 - Stack-based Buffer Overflow

Assigner

redhat redhat root

References

4 references

URL	Tags
https://access.redhat.com/errata/RHSA-2026:47768	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:55855	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-15370	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2499049	issue-trackingx_refsource_REDHAT

Impacted products

4 products

Vendor	Product	Version
Red Hat	Red Hat Enterprise Linux 10	Unaffected: 0:0.12.0-3.el10_2 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.2
Red Hat	Red Hat Hardened Images	Unaffected: 0.12.2-1.hum1 , < * (rpm) cpe:/a:redhat:hummingbird:1
Red Hat	Red Hat Enterprise Linux 8	cpe:/o:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9

Date Public

2026-07-21 09:02

Credits

Red Hat would like to thank Tristan for reporting this issue.

Show details on NVD website

JSON

To clipboard

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      "dataVersion": "5.2"
    }
  }
}

ALSA-2026:55855

Vulnerability from osv_almalinux – Published: 2026-08-17 00:00 – Updated: 2026-08-18 11:15 – Source website

Summary

Important: libssh security update

Details

libssh is a library which implements the SSH protocol. It can be used to implement client and server applications.

Security Fix(es):

libssh: libssh: information disclosure via short GSSAPI Curve25519 public key (CVE-2026-59842)
libssh: libssh: denial of service via zero advertised channel packet size (CVE-2026-59843)
libssh: libssh: denial of service via oversized SFTP read length (CVE-2026-59844)
libssh: libssh: denial of service via unchecked ProxyCommand fork() failure (CVE-2026-59845)
libssh: libssh: information disclosure via ProxyCommand %r username expansion (CVE-2026-59846)
libssh: libssh: integrity downgrade via OpenSSL AES-GCM tag verification (CVE-2026-59847)
libssh: libssh: denial of service via SFTP responses with unknown request IDs (CVE-2026-59848)
libssh: libssh: denial of service via automatic certificate authentication loop (CVE-2026-59849)
libssh: libssh: use-after-free via data callbacks on closed channels (CVE-2026-59850)
libssh: libssh: authentication bypass via missing GSSAPI principal check (CVE-2026-59851)
libssh: libssh: stack buffer overflow in SFTP server longname construction (CVE-2026-15370)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

References

URL

Type

	https://access.redhat.com/errata/RHSA-2026:55855	ADVISORY
	https://access.redhat.com/security/cve/CVE-2026-15370	REPORT
	https://access.redhat.com/security/cve/CVE-2026-59842	REPORT
	https://access.redhat.com/security/cve/CVE-2026-59843	REPORT
	https://access.redhat.com/security/cve/CVE-2026-59844	REPORT
	https://access.redhat.com/security/cve/CVE-2026-59845	REPORT
	https://access.redhat.com/security/cve/CVE-2026-59846	REPORT
	https://access.redhat.com/security/cve/CVE-2026-59847	REPORT
	https://access.redhat.com/security/cve/CVE-2026-59848	REPORT
	https://access.redhat.com/security/cve/CVE-2026-59849	REPORT
	https://access.redhat.com/security/cve/CVE-2026-59850	REPORT
	https://access.redhat.com/security/cve/CVE-2026-59851	REPORT
	https://bugzilla.redhat.com/2498168	REPORT
	https://bugzilla.redhat.com/2498176	REPORT
	https://bugzilla.redhat.com/2498177	REPORT
	https://bugzilla.redhat.com/2498178	REPORT
	https://bugzilla.redhat.com/2498179	REPORT
	https://bugzilla.redhat.com/2498180	REPORT
	https://bugzilla.redhat.com/2498181	REPORT
	https://bugzilla.redhat.com/2498182	REPORT
	https://bugzilla.redhat.com/2498183	REPORT
	https://bugzilla.redhat.com/2498184	REPORT
	https://bugzilla.redhat.com/2499049	REPORT
	https://errata.almalinux.org/10/ALSA-2026-55855.html	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "AlmaLinux:10",
        "name": "libssh"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.12.0-3.el10_2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "AlmaLinux:10",
        "name": "libssh-config"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.12.0-3.el10_2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "AlmaLinux:10",
        "name": "libssh-devel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.12.0-3.el10_2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "libssh is a library which implements the SSH protocol. It can be used to implement client and server applications.  \n\nSecurity Fix(es):  \n\n  * libssh: libssh: information disclosure via short GSSAPI Curve25519 public key (CVE-2026-59842)\n  * libssh: libssh: denial of service via zero advertised channel packet size (CVE-2026-59843)\n  * libssh: libssh: denial of service via oversized SFTP read length (CVE-2026-59844)\n  * libssh: libssh: denial of service via unchecked ProxyCommand fork() failure (CVE-2026-59845)\n  * libssh: libssh: information disclosure via ProxyCommand %r username expansion (CVE-2026-59846)\n  * libssh: libssh: integrity downgrade via OpenSSL AES-GCM tag verification (CVE-2026-59847)\n  * libssh: libssh: denial of service via SFTP responses with unknown request IDs (CVE-2026-59848)\n  * libssh: libssh: denial of service via automatic certificate authentication loop (CVE-2026-59849)\n  * libssh: libssh: use-after-free via data callbacks on closed channels (CVE-2026-59850)\n  * libssh: libssh: authentication bypass via missing GSSAPI principal check (CVE-2026-59851)\n  * libssh: libssh: stack buffer overflow in SFTP server longname construction (CVE-2026-15370)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n",
  "id": "ALSA-2026:55855",
  "modified": "2026-08-18T11:15:41Z",
  "published": "2026-08-17T00:00:00Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:55855"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-15370"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-59842"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-59843"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-59844"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-59845"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-59846"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-59847"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-59848"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-59849"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-59850"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-59851"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2498168"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2498176"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2498177"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2498178"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2498179"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2498180"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2498181"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2498182"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2498183"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2498184"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2499049"
    },
    {
      "type": "ADVISORY",
      "url": "https://errata.almalinux.org/10/ALSA-2026-55855.html"
    }
  ],
  "related": [
    "CVE-2026-59842",
    "CVE-2026-59843",
    "CVE-2026-59844",
    "CVE-2026-59845",
    "CVE-2026-59846",
    "CVE-2026-59847",
    "CVE-2026-59848",
    "CVE-2026-59849",
    "CVE-2026-59850",
    "CVE-2026-59851",
    "CVE-2026-15370"
  ],
  "summary": "Important: libssh security update"
}

BELL-CVE-2026-15370 (CVE-2026-15370)

Vulnerability from osv_bellsoft – Published: 2026-07-22 06:04 – Updated: 2026-07-29 15:42 – Source website

Severity

7.3 (High)


                    
                      CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

References

URL

Type

https://docs.bell-sw.com/security/cves/CVE-2026-15370

ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Alpaquita:23",
        "name": "libssh",
        "purl": "pkg:apk/alpaquita/libssh?arch=source\u0026distro=23"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.10.4-r0"
            },
            {
              "fixed": "0.11.5-r0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Alpaquita:25",
        "name": "libssh",
        "purl": "pkg:apk/alpaquita/libssh?arch=source\u0026distro=25"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.11.1-r0"
            },
            {
              "fixed": "0.11.5-r0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Alpaquita:stream",
        "name": "libssh",
        "purl": "pkg:apk/alpaquita/libssh?arch=source\u0026distro=stream"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.9.6-r1"
            },
            {
              "fixed": "0.12.1-r0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "id": "BELL-CVE-2026-15370",
  "modified": "2026-07-29T15:42:10.125841Z",
  "published": "2026-07-22T06:04:21.129487Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://docs.bell-sw.com/security/cves/CVE-2026-15370"
    }
  ],
  "schema_version": "1.7.4",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2026-15370"
  ]
}

FKIE_CVE-2026-15370

Vulnerability from fkie_nvd - Published: 2026-07-21 09:16 - Updated: 2026-08-17 22:16

Severity

6.7 (Medium) - CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
7.3 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

Summary

References

URL	Tags
secalert@redhat.com	https://access.redhat.com/errata/RHSA-2026:47768	Vendor Advisory
secalert@redhat.com	https://access.redhat.com/errata/RHSA-2026:55855
secalert@redhat.com	https://access.redhat.com/security/cve/CVE-2026-15370	Vendor Advisory
secalert@redhat.com	https://bugzilla.redhat.com/show_bug.cgi?id=2499049	Issue Tracking, Vendor Advisory

Impacted products

Vendor	Product	Version
libssh	libssh	-
redhat	hardened_images	-
redhat	enterprise_linux	10.0

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/o:redhat:enterprise_linux:10.2"
          ],
          "defaultStatus": "affected",
          "packageName": "libssh",
          "product": "Red Hat Enterprise Linux 10",
          "vendor": "Red Hat",
          "versions": [
            {
              "lessThan": "*",
              "status": "unaffected",
              "version": "0:0.12.0-3.el10_2",
              "versionType": "rpm"
            }
          ]
        },
        {
          "collectionURL": "https://catalog.redhat.com/software/containers/",
          "cpes": [
            "cpe:/a:redhat:hummingbird:1"
          ],
          "defaultStatus": "affected",
          "packageName": "libssh-main",
          "product": "Red Hat Hardened Images",
          "vendor": "Red Hat",
          "versions": [
            {
              "lessThan": "*",
              "status": "unaffected",
              "version": "0.12.2-1.hum1",
              "versionType": "rpm"
            }
          ]
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/o:redhat:enterprise_linux:8"
          ],
          "defaultStatus": "unaffected",
          "packageName": "libssh",
          "product": "Red Hat Enterprise Linux 8",
          "vendor": "Red Hat"
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/o:redhat:enterprise_linux:9"
          ],
          "defaultStatus": "unaffected",
          "packageName": "libssh",
          "product": "Red Hat Enterprise Linux 9",
          "vendor": "Red Hat"
        }
      ],
      "source": "secalert@redhat.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:libssh:libssh:-:*:*:*:*:*:*:*",
              "matchCriteriaId": "9B0EB43D-D594-43B0-AB33-5E8E1A6C8BEF",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:redhat:hardened_images:-:*:*:*:*:*:*:*",
              "matchCriteriaId": "87DEB507-5B64-47D7-9A50-3B87FD1E571F",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*",
              "matchCriteriaId": "D65C2163-CFC2-4ABB-8F4E-CB09CEBD006C",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A flaw was found in libssh. During SFTP server directory listing, the longname field is constructed with unsafe concatenation into a fixed-size stack buffer. When a client causes the server to list attacker-controlled filenames, sufficiently long names can overflow that stack buffer and may lead to crashes or possible code execution on the server."
    }
  ],
  "id": "CVE-2026-15370",
  "lastModified": "2026-08-17T22:16:59.007",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 6.7,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 0.8,
        "impactScore": 5.9,
        "source": "secalert@redhat.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.3,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.3,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-15370",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-22T17:49:15.900169Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-21T09:16:53.683",
  "references": [
    {
      "source": "secalert@redhat.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://access.redhat.com/errata/RHSA-2026:47768"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2026:55855"
    },
    {
      "source": "secalert@redhat.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://access.redhat.com/security/cve/CVE-2026-15370"
    },
    {
      "source": "secalert@redhat.com",
      "tags": [
        "Issue Tracking",
        "Vendor Advisory"
      ],
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2499049"
    }
  ],
  "sourceIdentifier": "secalert@redhat.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-121"
        }
      ],
      "source": "secalert@redhat.com",
      "type": "Secondary"
    }
  ]
}

GHSA-6J7F-8JJP-MM8C

Vulnerability from github – Published: 2026-07-21 09:31 – Updated: 2026-08-18 00:30

Details

Severity

6.7 (Medium)


                  
                    CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-15370"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-121"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-21T09:16:53Z",
    "severity": "MODERATE"
  },
  "details": "A flaw was found in libssh. During SFTP server directory listing, the longname field is constructed with unsafe concatenation into a fixed-size stack buffer. When a client causes the server to list attacker-controlled filenames, sufficiently long names can overflow that stack buffer and may lead to crashes or possible code execution on the server.",
  "id": "GHSA-6j7f-8jjp-mm8c",
  "modified": "2026-08-18T00:30:28Z",
  "published": "2026-07-21T09:31:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-15370"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:47768"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:55855"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/CVE-2026-15370"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2499049"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

OPENSUSE-SU-2026:11377-1

Vulnerability from csaf_opensuse - Published: 2026-07-26 00:00 - Updated: 2026-09-17 17:16

Summary

libssh-config-0.11.5-1.1 on GA media

Severity

Moderate

Scope

9 vulnerabilities in this advisory, including CVE-2026-15370.

CVE-2026-15370

6.7 (Medium)


                
                  CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H

Recommended: 16 products

Open the full advisory

OPENSUSE-SU-2026:21444-1

Vulnerability from csaf_opensuse - Published: 2026-07-25 17:18 - Updated: 2026-09-17 17:40

Summary

Security update for libssh

Severity

Moderate

Scope

9 vulnerabilities in this advisory, including CVE-2026-15370.

CVE-2026-15370

6.7 (Medium)


                
                  CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H

Recommended: 9 products

Open the full advisory

RHSA-2026:55855

Vulnerability from csaf_opensuse - Published: 2026-08-17 00:00 - Updated: 2026-09-16 18:44

Summary

security update for libssh

Severity

Important

Scope

11 vulnerabilities in this advisory, including CVE-2026-15370.

CVE-2026-15370

6.7 (Medium)


                
                  CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H

Recommended: 3 products

Open the full advisory

RHSA-2026:47768

Vulnerability from csaf_redhat - Published: 2026-07-29 10:37 - Updated: 2026-09-06 04:57

Summary

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Severity

Moderate

Scope

1 vulnerability in this advisory, including CVE-2026-15370.

CVE-2026-15370

6.7 (Medium)


                
                  CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H

Fixed: 4 products

https://access.redhat.com/errata/RHSA-2026:47768

Open the full advisory

RLSA-2026:55855 (CVE-2026-15370)

Vulnerability from osv_rocky – Published: 2026-08-18 12:07 – Updated: 2026-09-01 12:12 – Source website

Summary

Important: libssh security update

Details

libssh is a library which implements the SSH protocol. It can be used to implement client and server applications.

Security Fix(es):

libssh: libssh: information disclosure via short GSSAPI Curve25519 public key (CVE-2026-59842)
libssh: libssh: denial of service via zero advertised channel packet size (CVE-2026-59843)
libssh: libssh: denial of service via oversized SFTP read length (CVE-2026-59844)
libssh: libssh: denial of service via unchecked ProxyCommand fork() failure (CVE-2026-59845)
libssh: libssh: information disclosure via ProxyCommand %r username expansion (CVE-2026-59846)
libssh: libssh: integrity downgrade via OpenSSL AES-GCM tag verification (CVE-2026-59847)
libssh: libssh: denial of service via SFTP responses with unknown request IDs (CVE-2026-59848)
libssh: libssh: denial of service via automatic certificate authentication loop (CVE-2026-59849)
libssh: libssh: use-after-free via data callbacks on closed channels (CVE-2026-59850)
libssh: libssh: authentication bypass via missing GSSAPI principal check (CVE-2026-59851)
libssh: libssh: stack buffer overflow in SFTP server longname construction (CVE-2026-15370)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Severity

8.8 (High)


                    
                      CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Credits

Rocky Enterprise Software Foundation

Red Hat

References

URL

Type

	https://errata.rockylinux.org/RLSA-2026:55855	ADVISORY
	https://bugzilla.redhat.com/show_bug.cgi?id=2498180	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2498183	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2498168	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2498184	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2498181	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2498178	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2498176	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2499049	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2498177	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2498182	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2498179	REPORT
	https://access.redhat.com/errata/RHSA-2026:55855	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Rocky Linux:10",
        "name": "libssh",
        "purl": "pkg:rpm/rocky-linux/libssh?distro=rocky-linux-10\u0026epoch=0"
      },
      "ranges": [
        {
          "database_specific": {
            "yum_repository": "BaseOS"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0:0.12.0-3.el10_2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "credits": [
    {
      "name": "Rocky Enterprise Software Foundation"
    },
    {
      "name": "Red Hat"
    }
  ],
  "database_specific": {
    "license": "CC-BY-4.0",
    "license_url": "https://creativecommons.org/licenses/by/4.0/",
    "source_advisory": "RHSA-2026:55855"
  },
  "details": "libssh is a library which implements the SSH protocol. It can be used to implement client and server applications.\n\nSecurity Fix(es):\n\n* libssh: libssh: information disclosure via short GSSAPI Curve25519 public key (CVE-2026-59842)\n\n* libssh: libssh: denial of service via zero advertised channel packet size (CVE-2026-59843)\n\n* libssh: libssh: denial of service via oversized SFTP read length (CVE-2026-59844)\n\n* libssh: libssh: denial of service via unchecked ProxyCommand fork() failure (CVE-2026-59845)\n\n* libssh: libssh: information disclosure via ProxyCommand %r username expansion (CVE-2026-59846)\n\n* libssh: libssh: integrity downgrade via OpenSSL AES-GCM tag verification (CVE-2026-59847)\n\n* libssh: libssh: denial of service via SFTP responses with unknown request IDs (CVE-2026-59848)\n\n* libssh: libssh: denial of service via automatic certificate authentication loop (CVE-2026-59849)\n\n* libssh: libssh: use-after-free via data callbacks on closed channels (CVE-2026-59850)\n\n* libssh: libssh: authentication bypass via missing GSSAPI principal check (CVE-2026-59851)\n\n* libssh: libssh: stack buffer overflow in SFTP server longname construction (CVE-2026-15370)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
  "id": "RLSA-2026:55855",
  "modified": "2026-09-01T12:12:21.935201Z",
  "published": "2026-08-18T12:07:31.722662Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://errata.rockylinux.org/RLSA-2026:55855"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2498180"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2498183"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2498168"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2498184"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2498181"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2498178"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2498176"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2499049"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2498177"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2498182"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2498179"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:55855"
    }
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Important: libssh security update",
  "upstream": [
    "CVE-2026-15370",
    "CVE-2026-59842",
    "CVE-2026-59843",
    "CVE-2026-59844",
    "CVE-2026-59845",
    "CVE-2026-59846",
    "CVE-2026-59847",
    "CVE-2026-59848",
    "CVE-2026-59849",
    "CVE-2026-59850",
    "CVE-2026-59851"
  ]
}

SUSE-SU-2026:22940-1

Vulnerability from csaf_suse - Published: 2026-07-25 17:15 - Updated: 2026-09-16 20:08

Summary

Security update for libssh

Severity

Moderate

Scope

9 vulnerabilities in this advisory, including CVE-2026-15370.

CVE-2026-15370

6.7 (Medium)


                
                  CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H

Recommended: 5 products

Open the full advisory

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.

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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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.

Action not permitted

CVE-2026-15370 (GCVE-0-2026-15370)

BELL-CVE-2026-15370 (CVE-2026-15370)

RLSA-2026:55855 (CVE-2026-15370)

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Nomenclature

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