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CVE-2026-63091

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
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:cd1e78b921ab45be548d7b1c5312fd2dcd6c726a41036ef255e93f0f3635f6c9
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
2

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:583daf51b7611a3a0565eab02dc3b6a9b181373167fabec5e13888dcdebed794 · sha256:38d4b2c95296b918… · /containers/cna/metrics/1/cvssV3_1

{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":7.1,"baseSeverity":"HIGH","exploitMaturity":"NOT_DEFINED","privilegesRequired":"LOW","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"H…

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:583daf51b7611a3a0565eab02dc3b6a9b181373167fabec5e13888dcdebed794 · sha256:38d4b2c95296b918… · /containers/cna/metrics/0/cvssV4_0
cwe · 2 assertions

{"cweId":"CWE-190","description":"Integer Overflow or Wraparound","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:583daf51b7611a3a0565eab02dc3b6a9b181373167fabec5e13888dcdebed794 · sha256:38d4b2c95296b918… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-126","description":"Buffer Over-read","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:583daf51b7611a3a0565eab02dc3b6a9b181373167fabec5e13888dcdebed794 · sha256:38d4b2c95296b918… · /containers/cna/problemTypes/0/descriptions/1

Affected products and versions

1 source assertion
{"defaultStatus":"affected","product":"proftpd","repo":"https://github.com/proftpd/proftpd","vendor":"proftpd","versions":[{"lessThan":"1.3.9c","status":"affected","version":"0","versionType":"custom"},{"lessThan":"1.3.10rc3","status":"affected","version":"1.3.10rc1","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:583daf51b7611a3a0565eab02dc3b6a9b181373167fabec5e13888dcdebed794 · sha256:38d4b2c95296b918… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:583daf51b7611a3a0565eab02dc3b6a9b181373167fabec5e13888dcdebed794 · sha256:38d4b2c95296b918… · /containers/cna/metrics/1/cvssV3_1
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":7.1,"baseSeverity":"HIGH","exploitMaturity":"NOT_DEFINED","privilegesRequired":"LOW","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"H…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:583daf51b7611a3a0565eab02dc3b6a9b181373167fabec5e13888dcdebed794 · sha256:38d4b2c95296b918… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

2 source assertions
{"cweId":"CWE-190","description":"Integer Overflow or Wraparound","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:583daf51b7611a3a0565eab02dc3b6a9b181373167fabec5e13888dcdebed794 · sha256:38d4b2c95296b918… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-126","description":"Buffer Over-read","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:583daf51b7611a3a0565eab02dc3b6a9b181373167fabec5e13888dcdebed794 · sha256:38d4b2c95296b918… · /containers/cna/problemTypes/0/descriptions/1

Source references

6 source assertions
{"name":"Release Notes","tags":["release-notes"],"url":"https://github.com/proftpd/proftpd/blob/master/RELEASE_NOTES"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:583daf51b7611a3a0565eab02dc3b6a9b181373167fabec5e13888dcdebed794 · sha256:38d4b2c95296b918… · /containers/cna/references/0
{"name":"Patch Commit","tags":["patch"],"url":"https://github.com/proftpd/proftpd/commit/b9b7dde1bcd74bc23366484d53856b67b8d6d95e"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:583daf51b7611a3a0565eab02dc3b6a9b181373167fabec5e13888dcdebed794 · sha256:38d4b2c95296b918… · /containers/cna/references/4
{"name":"Pull Request","tags":["issue-tracking","patch"],"url":"https://github.com/proftpd/proftpd/pull/2201"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:583daf51b7611a3a0565eab02dc3b6a9b181373167fabec5e13888dcdebed794 · sha256:38d4b2c95296b918… · /containers/cna/references/3
{"name":"ProFTPD 1.3.10rc3-3 Release Notes","tags":["patch","release-notes"],"url":"https://github.com/proftpd/proftpd/releases/tag/v1.3.10rc3-3"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:583daf51b7611a3a0565eab02dc3b6a9b181373167fabec5e13888dcdebed794 · sha256:38d4b2c95296b918… · /containers/cna/references/1
{"name":"ProFTPD 1.3.9c Release Notes","tags":["patch","release-notes"],"url":"https://github.com/proftpd/proftpd/releases/tag/v1.3.9c"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:583daf51b7611a3a0565eab02dc3b6a9b181373167fabec5e13888dcdebed794 · sha256:38d4b2c95296b918… · /containers/cna/references/2
{"tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/proftpd-mod-sftp-signed-integer-overflow-via-scp-size-record-parser"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:583daf51b7611a3a0565eab02dc3b6a9b181373167fabec5e13888dcdebed794 · sha256:38d4b2c95296b918… · /containers/cna/references/5

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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