CVE-2026-63090

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-07-20. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

ProFTPD before 1.3.9c and 1.3.10rc3 contains a heap-based buffer overflow vulnerability in the mod_sftp module that allows authenticated low-privilege attackers to achieve arbitrary code execution by sending crafted SFTP packet fragments exceeding the 16 KB reassembly buffer in the fxp.c component. Attackers can supply oversized fragments to trigger an incorrectly conditioned reallocation, corrupt pool freelist metadata, overwrite the root_fs BSS global pointer to reference a fake filesystem struct, and redirect pr_fsio_stat() to system() via a crafted RENAME request.

CVSS v3
8.8
EG Score
8.8(high)
EG Risk
40(Track)
EG Risk 40/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity88% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
38%
KEV
Not listed

Published

July 20, 2026

Last Modified

July 23, 2026

Advisory Details (6)

Auto-updated Jul 20, 2026
Patch available. Sources: github_commit, github_release.
generic

ProFTPD mod_sftp Heap Buffer Overflow via SFTP Packet Reassembly | Advisories | VulnCheck

https://www.vulncheck.com/advisories/proftpd-mod-sftp-heap-buffer-overflow-via-sftp-packet-reassembly
github_release Patch Available

v1.3.9c

Patch available: proftpd/proftpd v1.3.9c

https://github.com/proftpd/proftpd/releases/tag/v1.3.9c
github_release Patch Available

v1.3.10rc3

Patch available: proftpd/proftpd v1.3.10rc3-3 (pre-release)

https://github.com/proftpd/proftpd/releases/tag/v1.3.10rc3-3
generic

Authenticated SFTP sessions can overflow the SFTP packet buffer · Issue #2190 · proftpd/proftpd · GitHub

https://github.com/proftpd/proftpd/issues/2190
github_commit Patch Available

commit 4ee8701bcf42 (proftpd/proftpd)

Patch available: proftpd/proftpd v1.3.10rc3-3 (contains commit 4ee8701bcf42)

https://github.com/proftpd/proftpd/commit/4ee8701bcf425f11b3b2116e634ff3e655d918b1
generic

proftpd/RELEASE_NOTES at master · proftpd/proftpd · GitHub

https://github.com/proftpd/proftpd/blob/master/RELEASE_NOTES

Vendor Advisories for CVE-2026-63090(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 24× in last 7d / 24× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-27 02:25 UTCGHSA enrichment
  2. 2026-07-26 15:27 UTCEG score recompute
  3. 2026-07-26 15:27 UTCGHSA enrichment
  4. 2026-07-26 14:54 UTCEPSS rescore
  5. 2026-07-26 14:54 UTCEPSS rescore
  6. 2026-07-26 04:30 UTCEG score recompute
  7. 2026-07-26 04:30 UTCGHSA enrichment
  8. 2026-07-25 14:18 UTCEPSS rescore
  9. 2026-07-25 14:18 UTCEPSS rescore
  10. 2026-07-24 14:18 UTCEPSS rescore
  11. 2026-07-24 14:18 UTCEPSS rescore
  12. 2026-07-23 14:18 UTCEPSS rescore
  13. 2026-07-23 14:18 UTCEPSS rescore
  14. 2026-07-23 03:22 UTCEG score recompute
  15. 2026-07-22 23:39 UTCEG score recompute
  16. 2026-07-22 23:39 UTCGHSA enrichment
  17. 2026-07-22 14:08 UTCEPSS rescore
  18. 2026-07-22 14:08 UTCEPSS rescore
  19. 2026-07-21 15:25 UTCEPSS rescore
  20. 2026-07-21 15:25 UTCEPSS rescore
  21. 2026-07-20 16:39 UTCEG score recompute
  22. 2026-07-20 16:39 UTCGHSA enrichment
  23. 2026-07-20 14:32 UTCEG score recompute
  24. 2026-07-20 14:32 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-63090?
CVE-2026-63090 is a high vulnerability published on July 20, 2026. ProFTPD before 1.3.9c and 1.3.10rc3 contains a heap-based buffer overflow vulnerability in the modsftp module that allows authenticated low-privilege attackers to achieve arbitrary code execution by sending crafted SFTP packet fragments exceeding the 16 KB reassembly buffer in the fxp.c component.…
When was CVE-2026-63090 disclosed?
CVE-2026-63090 was first published in the National Vulnerability Database on July 20, 2026, with the most recent update on July 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-63090 actively exploited?
CVE-2026-63090 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 62.3% of all scored CVEs.
What is the CVSS score of CVE-2026-63090?
CVE-2026-63090 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-63090?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-63090, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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