CVE-2026-63091 (GCVE-0-2026-63091)

Vulnerability from cvelistv5 – Published: 2026-07-20 14:22 – Updated: 2026-07-28 01:49 X_Open Source
VLAI
Title
ProFTPD mod_sftp Signed Integer Overflow via SCP Size-Record Parser
Summary
ProFTPD before 1.3.9c and 1.3.10rc3 contains a signed integer overflow vulnerability in the mod_sftp module's SCP size-record parser that allows authenticated low-privilege attackers to bypass ASLR by sending a crafted file size value of UINT64_MAX, which results in a negative off_t value. Attackers can exploit the subsequent conversion to uint32_t, causing an approximately 4 GB requested read length and forcing the server to read beyond the end of the SSH channel data and write overread process memory into the uploaded file. In tested configurations, the disclosed data contains libc, libcrypto, and PIE pointers sufficient to derive their randomized base addresses, thereby bypassing ASLR and enabling reliable exploitation of memory corruption vulnerabilities in the same process.
Severity
7.1 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-20 16:32 UTC
CWE
Assigner
VulnCheck CNA under the mitre root
CNA scorecard B 84/100 over 6517 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
proftpd proftpd Affected: 0 , < 1.3.9c (custom)
Affected: 1.3.10rc1 , < 1.3.10rc3 (custom)
    cpe:2.3:a:proftpd:proftpd:*:*:*:*:*:*:*:*
    cpe:2.3:a:proftpd:proftpd:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-07-01 00:00
Credits
Fabian Wahle with Hap Security
Show details on NVD website
To clipboard 

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                  "lang": "en",
                  "type": "CWE"
                },
                {
                  "cweId": "CWE-126",
                  "description": "Buffer Over-read",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-07-28T01:49:57.949Z",
            "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
            "shortName": "VulnCheck"
          },
          "references": [
            {
              "name": "Release Notes",
              "tags": [
                "release-notes"
              ],
              "url": "https://github.com/proftpd/proftpd/blob/master/RELEASE_NOTES"
            },
            {
              "name": "ProFTPD 1.3.10rc3-3 Release Notes",
              "tags": [
                "patch",
                "release-notes"
              ],
              "url": "https://github.com/proftpd/proftpd/releases/tag/v1.3.10rc3-3"
            },
            {
              "name": "ProFTPD 1.3.9c Release Notes",
              "tags": [
                "patch",
                "release-notes"
              ],
              "url": "https://github.com/proftpd/proftpd/releases/tag/v1.3.9c"
            },
            {
              "name": "Pull Request",
              "tags": [
                "issue-tracking",
                "patch"
              ],
              "url": "https://github.com/proftpd/proftpd/pull/2201"
            },
            {
              "name": "Patch Commit",
              "tags": [
                "patch"
              ],
              "url": "https://github.com/proftpd/proftpd/commit/b9b7dde1bcd74bc23366484d53856b67b8d6d95e"
            },
            {
              "tags": [
                "third-party-advisory"
              ],
              "url": "https://www.vulncheck.com/advisories/proftpd-mod-sftp-signed-integer-overflow-via-scp-size-record-parser"
            }
          ],
          "source": {
            "discovery": "UNKNOWN"
          },
          "tags": [
            "x_open-source"
          ],
          "title": "ProFTPD mod_sftp Signed Integer Overflow via SCP Size-Record Parser",
          "x_generator": {
            "engine": "vulncheck"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "assignerShortName": "VulnCheck",
        "cveId": "CVE-2026-63091",
        "datePublished": "2026-07-20T14:22:29.202Z",
        "dateReserved": "2026-07-15T15:45:44.600Z",
        "dateUpdated": "2026-07-28T01:49:57.949Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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