GHSA-PWRF-JM93-99R3

Vulnerability from github – Published: 2025-08-20 15:31 – Updated: 2026-05-19 15:31
VLAI
Details

There's a vulnerability in the libssh package where when a libssh consumer passes in an unexpectedly large input buffer to ssh_get_fingerprint_hash() function. In such cases the bin_to_base64() function can experience an integer overflow leading to a memory under allocation, when that happens it's possible that the program perform out of bounds write leading to a heap corruption. This issue affects only 32-bits builds of libssh.

Severity
4.5 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
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{
  "affected": [],
  "aliases": [
    "CVE-2025-4877"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-787"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-08-20T13:15:28Z",
    "severity": "MODERATE"
  },
  "details": "There\u0027s a vulnerability in the libssh package where when a libssh consumer passes in an unexpectedly large input buffer to ssh_get_fingerprint_hash() function. In such cases the bin_to_base64() function can experience an integer overflow leading to a memory under allocation, when that happens it\u0027s possible that the program perform out of bounds write leading to a heap corruption.\nThis issue affects only 32-bits builds of libssh.",
  "id": "GHSA-pwrf-jm93-99r3",
  "modified": "2026-05-19T15:31:19Z",
  "published": "2025-08-20T15:31:41Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-4877"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:18683"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/CVE-2025-4877"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2376193"
    },
    {
      "type": "WEB",
      "url": "https://git.libssh.org/projects/libssh.git/commit/?h=stable-0.11\u0026id=6fd9cc8ce3958092a1aae11f1f2e911b2747732d"
    },
    {
      "type": "WEB",
      "url": "https://www.libssh.org/security/advisories/CVE-2025-4877.txt"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L",
      "type": "CVSS_V3"
    }
  ]
}



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