Vulnerability-Lookup

OPENSUSE-SU-2026:11109-1

Vulnerability from csaf_opensuse - Published: 2026-06-23 00:00 - Updated: 2026-09-17 17:11

Summary

libssh2-1-1.11.1-3.1 on GA media

Severity

Moderate

Notes

Title of the patch: libssh2-1-1.11.1-3.1 on GA media

Description of the patch: These are all security issues fixed in the libssh2-1-1.11.1-3.1 package on the GA media of openSUSE Tumbleweed.

Patchnames: openSUSE-Tumbleweed-2026-11109

CVE-2025-15661

6.8 (Medium)


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

Affected products

Recommended 12 products

Product	Version	Remediation
Unresolved product id: openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.aarch64	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.ppc64le	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.s390x	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.x86_64	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.aarch64	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.ppc64le	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.s390x	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.x86_64	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:libssh2-devel-0:1.11.1-3.1.aarch64	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:libssh2-devel-0:1.11.1-3.1.ppc64le	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:libssh2-devel-0:1.11.1-3.1.s390x	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:libssh2-devel-0:1.11.1-3.1.x86_64	—	Vendor Fix

Threats

Impact moderate

CVE-2026-55199

5.9 (Medium)


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

Affected products

Recommended 12 products, the same list as for CVE-2025-15661

Threats

Impact moderate

CVE-2026-55200

8.1 (High)


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

Affected products

Recommended 12 products, the same list as for CVE-2025-15661

Threats

Impact important

CVE-2026-7598

7.3 (High)


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

Affected products

Recommended 12 products, the same list as for CVE-2025-15661

Threats

Impact important

References

16 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/o…	self
https://www.suse.com/security/cve/CVE-2025-15661/	self
https://www.suse.com/security/cve/CVE-2026-55199/	self
https://www.suse.com/security/cve/CVE-2026-55200/	self
https://www.suse.com/security/cve/CVE-2026-7598/	self
https://www.suse.com/security/cve/CVE-2025-15661	external
https://bugzilla.suse.com/1268546	external
https://www.suse.com/security/cve/CVE-2026-55199	external
https://bugzilla.suse.com/1268530	external
https://bugzilla.suse.com/1270343	external
https://www.suse.com/security/cve/CVE-2026-55200	external
https://bugzilla.suse.com/1268531	external
https://bugzilla.suse.com/1271707	external
https://www.suse.com/security/cve/CVE-2026-7598	external
https://bugzilla.suse.com/1263890	external

JSON

To clipboard

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  "vulnerabilities": [
    {
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      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2025-15661"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "libssh2 through 1.11.1, fixed in commit 2dae302, contains an out-of-bounds heap read vulnerability in the sftp_symlink() function in src/sftp.c that allows a malicious SSH server or man-in-the-middle attacker to disclose heap memory contents or cause a crash by sending a crafted SSH_FXP_NAME response. Attackers can supply a link_len value larger than the actual packet data in SSH_FXP_NAME responses for SFTP READLINK and REALPATH operations, triggering a heap buffer over-read of up to target_len minus one bytes due to the missing validation of available packet buffer size before the memcpy operation.",
          "title": "CVE description"
        }
      ],
      "product_status": {
        "recommended": [
          "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.aarch64",
          "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.ppc64le",
          "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.s390x",
          "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.x86_64",
          "openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.aarch64",
          "openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.ppc64le",
          "openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.s390x",
          "openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.x86_64",
          "openSUSE Tumbleweed:libssh2-devel-0:1.11.1-3.1.aarch64",
          "openSUSE Tumbleweed:libssh2-devel-0:1.11.1-3.1.ppc64le",
          "openSUSE Tumbleweed:libssh2-devel-0:1.11.1-3.1.s390x",
          "openSUSE Tumbleweed:libssh2-devel-0:1.11.1-3.1.x86_64"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "CVE-2025-15661",
          "url": "https://www.suse.com/security/cve/CVE-2025-15661"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1268546 for CVE-2025-15661",
          "url": "https://bugzilla.suse.com/1268546"
        }
      ],
      "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": [
            "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.aarch64",
            "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.ppc64le",
            "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.s390x",
            "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.x86_64",
            "openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.aarch64",
            "openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.ppc64le",
            "openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.s390x",
            "openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.x86_64",
            "openSUSE Tumbleweed:libssh2-devel-0:1.11.1-3.1.aarch64",
            "openSUSE Tumbleweed:libssh2-devel-0:1.11.1-3.1.ppc64le",
            "openSUSE Tumbleweed:libssh2-devel-0:1.11.1-3.1.s390x",
            "openSUSE Tumbleweed:libssh2-devel-0:1.11.1-3.1.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 6.8,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.aarch64",
            "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.ppc64le",
            "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.s390x",
            "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.x86_64",
            "openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.aarch64",
            "openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.ppc64le",
            "openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.s390x",
            "openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.x86_64",
            "openSUSE Tumbleweed:libssh2-devel-0:1.11.1-3.1.aarch64",
            "openSUSE Tumbleweed:libssh2-devel-0:1.11.1-3.1.ppc64le",
            "openSUSE Tumbleweed:libssh2-devel-0:1.11.1-3.1.s390x",
            "openSUSE Tumbleweed:libssh2-devel-0:1.11.1-3.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-06-23T00:00:00Z",
          "details": "moderate"
        }
      ],
      "title": "CVE-2025-15661"
    },
    {
      "cve": "CVE-2026-55199",
      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2026-55199"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "libssh2 through 1.11.1, fixed in commit 1762685, contains a pre-authentication denial of service vulnerability in the SSH_MSG_EXT_INFO handler in src/packet.c that allows a malicious SSH server to cause a client CPU exhaustion loop by sending a crafted extension count value. A malicious server can set nr_extensions to 0xFFFFFFFF during key exchange, causing the client to spin in a tight CPU loop for over 60 seconds because return values from _libssh2_get_string() are unchecked and the session timeout does not apply to CPU-bound loops.",
          "title": "CVE description"
        }
      ],
      "product_status": {
        "recommended": [
          "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.aarch64",
          "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.ppc64le",
          "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.s390x",
          "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.x86_64",
          "openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.aarch64",
          "openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.ppc64le",
          "openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.s390x",
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          "openSUSE Tumbleweed:libssh2-devel-0:1.11.1-3.1.ppc64le",
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      "references": [
        {
          "category": "external",
          "summary": "CVE-2026-55199",
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        },
        {
          "category": "external",
          "summary": "SUSE Bug 1268530 for CVE-2026-55199",
          "url": "https://bugzilla.suse.com/1268530"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1270343 for CVE-2026-55199",
          "url": "https://bugzilla.suse.com/1270343"
        }
      ],
      "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": [
            "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.aarch64",
            "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.ppc64le",
            "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.s390x",
            "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.x86_64",
            "openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.aarch64",
            "openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.ppc64le",
            "openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.s390x",
            "openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.x86_64",
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            "openSUSE Tumbleweed:libssh2-devel-0:1.11.1-3.1.ppc64le",
            "openSUSE Tumbleweed:libssh2-devel-0:1.11.1-3.1.s390x",
            "openSUSE Tumbleweed:libssh2-devel-0:1.11.1-3.1.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:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.aarch64",
            "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.ppc64le",
            "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.s390x",
            "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.x86_64",
            "openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.aarch64",
            "openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.ppc64le",
            "openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.s390x",
            "openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.x86_64",
            "openSUSE Tumbleweed:libssh2-devel-0:1.11.1-3.1.aarch64",
            "openSUSE Tumbleweed:libssh2-devel-0:1.11.1-3.1.ppc64le",
            "openSUSE Tumbleweed:libssh2-devel-0:1.11.1-3.1.s390x",
            "openSUSE Tumbleweed:libssh2-devel-0:1.11.1-3.1.x86_64"
          ]
        }
      ],
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        {
          "category": "impact",
          "date": "2026-06-23T00:00:00Z",
          "details": "moderate"
        }
      ],
      "title": "CVE-2026-55199"
    },
    {
      "cve": "CVE-2026-55200",
      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2026-55200"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "libssh2 through 1.11.1, fixed in commit 7acf3df contains an out-of-bounds write vulnerability in ssh2_transport_read() that fails to enforce upper bounds on packet_length field. Remote attackers can send crafted SSH packets with excessively large packet_length values to corrupt heap memory and achieve remote code execution.",
          "title": "CVE description"
        }
      ],
      "product_status": {
        "recommended": [
          "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.aarch64",
          "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.ppc64le",
          "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.s390x",
          "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.x86_64",
          "openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.aarch64",
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          "openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.s390x",
          "openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.x86_64",
          "openSUSE Tumbleweed:libssh2-devel-0:1.11.1-3.1.aarch64",
          "openSUSE Tumbleweed:libssh2-devel-0:1.11.1-3.1.ppc64le",
          "openSUSE Tumbleweed:libssh2-devel-0:1.11.1-3.1.s390x",
          "openSUSE Tumbleweed:libssh2-devel-0:1.11.1-3.1.x86_64"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "CVE-2026-55200",
          "url": "https://www.suse.com/security/cve/CVE-2026-55200"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1268531 for CVE-2026-55200",
          "url": "https://bugzilla.suse.com/1268531"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1271707 for CVE-2026-55200",
          "url": "https://bugzilla.suse.com/1271707"
        }
      ],
      "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": [
            "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.aarch64",
            "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.ppc64le",
            "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.s390x",
            "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.x86_64",
            "openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.aarch64",
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            "openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.s390x",
            "openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.x86_64",
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            "openSUSE Tumbleweed:libssh2-devel-0:1.11.1-3.1.ppc64le",
            "openSUSE Tumbleweed:libssh2-devel-0:1.11.1-3.1.s390x",
            "openSUSE Tumbleweed:libssh2-devel-0:1.11.1-3.1.x86_64"
          ]
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      ],
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            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
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            "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.ppc64le",
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            "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.x86_64",
            "openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.aarch64",
            "openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.ppc64le",
            "openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.s390x",
            "openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.x86_64",
            "openSUSE Tumbleweed:libssh2-devel-0:1.11.1-3.1.aarch64",
            "openSUSE Tumbleweed:libssh2-devel-0:1.11.1-3.1.ppc64le",
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            "openSUSE Tumbleweed:libssh2-devel-0:1.11.1-3.1.x86_64"
          ]
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      ],
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          "category": "impact",
          "date": "2026-06-23T00:00:00Z",
          "details": "important"
        }
      ],
      "title": "CVE-2026-55200"
    },
    {
      "cve": "CVE-2026-7598",
      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2026-7598"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "A security vulnerability has been detected in libssh2 up to 1.11.1. The impacted element is the function userauth_password of the file src/userauth.c. Such manipulation of the argument username_len/password_len leads to integer overflow. The attack may be launched remotely. The name of the patch is 256d04b60d80bf1190e96b0ad1e91b2174d744b1. A patch should be applied to remediate this issue.",
          "title": "CVE description"
        }
      ],
      "product_status": {
        "recommended": [
          "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.aarch64",
          "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.ppc64le",
          "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.s390x",
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          "openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.ppc64le",
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          "openSUSE Tumbleweed:libssh2-devel-0:1.11.1-3.1.ppc64le",
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          "summary": "CVE-2026-7598",
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        },
        {
          "category": "external",
          "summary": "SUSE Bug 1263890 for CVE-2026-7598",
          "url": "https://bugzilla.suse.com/1263890"
        }
      ],
      "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": [
            "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.aarch64",
            "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.ppc64le",
            "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.s390x",
            "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.x86_64",
            "openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.aarch64",
            "openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.ppc64le",
            "openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.s390x",
            "openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.x86_64",
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            "openSUSE Tumbleweed:libssh2-devel-0:1.11.1-3.1.ppc64le",
            "openSUSE Tumbleweed:libssh2-devel-0:1.11.1-3.1.s390x",
            "openSUSE Tumbleweed:libssh2-devel-0:1.11.1-3.1.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 7.3,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
            "version": "3.1"
          },
          "products": [
            "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.aarch64",
            "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.ppc64le",
            "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.s390x",
            "openSUSE Tumbleweed:libssh2-1-0:1.11.1-3.1.x86_64",
            "openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.aarch64",
            "openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.ppc64le",
            "openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.s390x",
            "openSUSE Tumbleweed:libssh2-1-32bit-0:1.11.1-3.1.x86_64",
            "openSUSE Tumbleweed:libssh2-devel-0:1.11.1-3.1.aarch64",
            "openSUSE Tumbleweed:libssh2-devel-0:1.11.1-3.1.ppc64le",
            "openSUSE Tumbleweed:libssh2-devel-0:1.11.1-3.1.s390x",
            "openSUSE Tumbleweed:libssh2-devel-0:1.11.1-3.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-06-23T00:00:00Z",
          "details": "important"
        }
      ],
      "title": "CVE-2026-7598"
    }
  ]
}

CVE-2025-15661 (GCVE-0-2025-15661)

Vulnerability from cvelistv5 – Published: 2026-06-18 20:18 – Updated: 2026-07-14 22:25 X_Open Source

Title

libssh2 - Heap Buffer Over-read via sftp_symlink() in sftp.c

Summary

libssh2 through 1.11.1, fixed in commit 2dae302, contains an out-of-bounds heap read vulnerability in the sftp_symlink() function in src/sftp.c that allows a malicious SSH server or man-in-the-middle attacker to disclose heap memory contents or cause a crash by sending a crafted SSH_FXP_NAME response. Attackers can supply a link_len value larger than the actual packet data in SSH_FXP_NAME responses for SFTP READLINK and REALPATH operations, triggering a heap buffer over-read of up to target_len minus one bytes due to the missing validation of available packet buffer size before the memcpy operation.

Severity

8.3 (High)


                        
                          CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N

6.5 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-22 18:07 UTC

CWE

CWE-125 - Out-of-bounds Read

Assigner

VulnCheck mitre root

References

4 references

URL	Tags
https://github.com/libssh2/libssh2/pull/1705	issue-tracking
https://github.com/libssh2/libssh2/pull/1717	issue-tracking
https://github.com/libssh2/libssh2/commit/2dae302…	patch
https://www.vulncheck.com/advisories/libssh2-heap…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
libssh2	libssh2	Affected: 0 , ≤ 1.11.1 (semver) Unaffected: 2dae3024897e1898d389835151f4e9606227721d (git) cpe:2.3:a:libssh2:libssh2::::::::

Date Public

2025-10-06 00:00

Credits

Joshua Rogers Tristan Madani (@TristanInSec)

Show details on NVD website

JSON

To clipboard

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CVE-2026-55199 (GCVE-0-2026-55199)

Vulnerability from cvelistv5 – Published: 2026-06-17 18:44 – Updated: 2026-07-14 21:33 X_Open Source

Title

libssh2 - Pre-Authentication DoS via SSH_MSG_EXT_INFO Handler

Summary

libssh2 through 1.11.1, fixed in commit 1762685, contains a pre-authentication denial of service vulnerability in the SSH_MSG_EXT_INFO handler in src/packet.c that allows a malicious SSH server to cause a client CPU exhaustion loop by sending a crafted extension count value. A malicious server can set nr_extensions to 0xFFFFFFFF during key exchange, causing the client to spin in a tight CPU loop for over 60 seconds because return values from _libssh2_get_string() are unchecked and the session timeout does not apply to CPU-bound loops.

Severity

8.2 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

5.9 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-18 15:31 UTC

CWE

CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Assigner

VulnCheck mitre root

References

3 references

URL	Tags
https://github.com/libssh2/libssh2/pull/1864	issue-tracking
https://github.com/libssh2/libssh2/commit/1762685…	patch
https://www.vulncheck.com/advisories/libssh2-pre-…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
libssh2	libssh2	Affected: 0 , ≤ 1.11.1 (semver) Unaffected: 17626857d20b3c9a1addfa45979dadcee1cd84a4 (git) cpe:2.3:a:libssh2:libssh2::::::::

Date Public

2026-04-15 00:00

Credits

Tristan Madani (@TristanInSec)

Show details on NVD website

JSON

To clipboard

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CVE-2026-55200 (GCVE-0-2026-55200)

Vulnerability from cvelistv5 – Published: 2026-06-17 19:03 – Updated: 2026-07-14 21:33 X_Open Source

Title

libssh2 - Out-of-Bounds Write via Unchecked packet_length in transport.c

Summary

libssh2 through 1.11.1, fixed in commit 7acf3df contains an out-of-bounds write vulnerability in ssh2_transport_read() that fails to enforce upper bounds on packet_length field. Remote attackers can send crafted SSH packets with excessively large packet_length values to corrupt heap memory and achieve remote code execution.

Severity

9.2 (Critical)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

8.1 (High)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-17 00:00 UTC

CWE

CWE-680 - Integer Overflow to Buffer Overflow

Assigner

VulnCheck mitre root

References

4 references

URL	Tags
https://github.com/libssh2/libssh2/pull/2052	issue-tracking
https://github.com/libssh2/libssh2/commit/97acf3d…	patch
https://www.vulncheck.com/advisories/libssh2-out-…	third-party-advisory
https://web.archive.org/web/20260623211210/https:…	exploit

Impacted products

1 product

Vendor	Product	Version
libssh2	libssh2	Affected: 0 , ≤ 1.11.1 (semver) Unaffected: 7acf3dfda80c91c3a8c9f2372546301d4a1a7a8 (git) cpe:2.3:a:libssh2:libssh2::::::::

Date Public

2026-06-12 00:00

Credits

Tristan Madani (@TristanInSec)

Show details on NVD website

JSON

To clipboard

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CVE-2026-7598 (GCVE-0-2026-7598)

Vulnerability from cvelistv5 – Published: 2026-05-01 21:30 – Updated: 2026-09-01 12:04 X_Open Source

Title

libssh2 userauth.c userauth_password integer overflow

Summary

A security vulnerability has been detected in libssh2 up to 1.11.1. The impacted element is the function userauth_password of the file src/userauth.c. Such manipulation of the argument username_len/password_len leads to integer overflow. The attack may be launched remotely. The name of the patch is 256d04b60d80bf1190e96b0ad1e91b2174d744b1. A patch should be applied to remediate this issue.

Severity

6.9 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X

7.3 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:X/RL:O/RC:C

7.3 (High)


                        
                          CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:X/RL:O/RC:C

9.1 (Critical)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-04 13:31 UTC

CWE

CWE-190 - Integer Overflow
CWE-189 - Numeric Error
CWE-190 - Integer Overflow or Wraparound

Assigner

VulDB mitre root

References

12 references

URL	Tags
https://vuldb.com/vuln/360555	vdb-entrytechnical-description
https://vuldb.com/vuln/360555/cti	signaturepermissions-required
https://vuldb.com/submit/805564	third-party-advisory
https://github.com/libssh2/libssh2/pull/1858	issue-trackingpatch
https://github.com/libssh2/libssh2/commit/256d04b…	patch
https://github.com/libssh2/libssh2/	product
https://access.redhat.com/security/cve/CVE-2026-7598	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2464597	issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v…	x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:61752	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:7021	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:16736	vendor-advisoryx_refsource_REDHAT

Impacted products

8 products

Vendor	Product	Version
n/a	libssh2	Affected: 1.11.0 Affected: 1.11.1 cpe:2.3:a:libssh2:libssh2::::::::
Red Hat	Red Hat Hardened Images	Unaffected: 1.95.0-5.hum1 , < * (rpm) cpe:/a:redhat:hummingbird:1
Red Hat	Red Hat Hardened Images	Unaffected: 1.11.1-5.1.hum1 , < * (rpm) cpe:/a:redhat:hummingbird:1
Red Hat	Red Hat Enterprise Linux 6	cpe:/o:redhat:enterprise_linux:6
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7
Red Hat	Red Hat OpenShift Container Platform 4	cpe:/a:redhat:openshift:4
Red Hat	Red Hat OpenShift Update Service	cpe:/a:redhat:openshift_update_service:5
Red Hat	Red Hat Trusted Profile Analyzer	cpe:/a:redhat:trusted_profile_analyzer:2

Credits

dapickle (VulDB User)

Show details on NVD website

JSON

To clipboard

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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.

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.

Action not permitted

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CVE-2026-55199 (GCVE-0-2026-55199)

CVE-2026-55200 (GCVE-0-2026-55200)

CVE-2026-7598 (GCVE-0-2026-7598)

Tags

Sightings

Nomenclature

Related by attack behaviour