{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "0.63.2"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "8a51a0dca4f6fbdcc3ce98c627254026b25b3252"
            }
          ],
          "repo": "https://github.com/eugeny/russh",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-g4mp-vgx3-xrvm"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-125",
      "CWE-789"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102820.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "fixed": "0.2.3"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "pageant provides a [PageantStream] type that implements [AsyncRead] and [AsyncWrite] traits and can be used to talk to a running Pageant instance. Prior to pageant 0.2.3, the Windows pageant crate's pageant/src/wmmessage.rs MemoryMap::read function trusts a peer-controlled u32 response length supplied through the 8192-byte Pageant shared-memory mapping reached by AgentClient::connect_pageant. A local process that impersonates the Pageant window can make query_pageant_direct allocate up to approximately 4 GiB and copy beyond the mapped view, reliably crashing a russh client and conditionally exposing adjacent committed memory. This issue is fixed in pageant 0.2.3.",
  "id": "CVE-2026-102820",
  "modified": "2026-09-30T03:30:48.588850711Z",
  "published": "2026-09-29T18:18:43.297Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102820.json"
    },
    {
      "type": "FIX",
      "url": "https://github.com/Eugeny/russh/commit/5d566989ebabfdebfe6b33243d31765a0812260b"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Eugeny/russh/releases/tag/v0.63.2"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/Eugeny/russh/security/advisories/GHSA-g4mp-vgx3-xrvm"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-102820"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "pageant: Out-of-bounds read / oversized allocation in `pageant` MemoryMap::read via a malicious Pageant agent (Windows)"
}