CVE-2026-63090

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM 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 — 3 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: 1%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(medium)
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%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
59%
KEV
Not listed

Published

July 20, 2026

Last Modified

July 30, 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.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
proftpd-dfsg1.3.7a+dfsg-12 ... 1.3.9~dfsg-5 (36 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
proftpd-dfsg1.3.8+dfsg-4 ... 1.3.9~dfsg-5 (28 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
proftpd-dfsg1.3.8.c+dfsg-4 ... 1.3.9~dfsg-5 (12 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
proftpd-dfsg1.3.8.c+dfsg-4 ... 1.3.9~dfsg-5 (8 versions)1.3.9c~dfsg-1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 19× in last 7d / 91× 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.

Showing the most recent 100 of 185 total refreshes for this CVE.

  1. 2026-09-11 20:31 UTCEG score recompute
  2. 2026-09-11 20:31 UTCGHSA enrichment
  3. 2026-09-11 14:53 UTCEPSS rescore
  4. 2026-09-11 09:37 UTCEPSS rescore
  5. 2026-09-11 09:29 UTCEG score recompute
  6. 2026-09-11 09:29 UTCGHSA enrichment
  7. 2026-09-09 11:58 UTCEG score recompute
  8. 2026-09-09 11:58 UTCGHSA enrichment
  9. 2026-09-08 22:01 UTCEPSS rescore
  10. 2026-09-07 22:56 UTCEG score recompute
  11. 2026-09-07 22:56 UTCGHSA enrichment
  12. 2026-09-07 16:01 UTCEPSS rescore
  13. 2026-09-06 13:47 UTCEPSS rescore
  14. 2026-09-06 11:46 UTCGHSA enrichment
  15. 2026-09-05 20:32 UTCEG score recompute
  16. 2026-09-05 20:31 UTCGHSA enrichment
  17. 2026-09-05 15:31 UTCEPSS rescore
  18. 2026-09-05 09:35 UTCEG score recompute
  19. 2026-09-05 09:35 UTCGHSA enrichment
  20. 2026-09-04 05:07 UTCEPSS rescore
  21. 2026-09-02 14:12 UTCEPSS rescore
  22. 2026-09-01 13:54 UTCEPSS rescore
  23. 2026-09-01 04:40 UTCEPSS rescore
  24. 2026-08-31 00:38 UTCEG score recompute
  25. 2026-08-31 00:38 UTCGHSA enrichment
Show 75 more
  1. 2026-08-30 19:17 UTCEPSS rescore
  2. 2026-08-30 13:41 UTCGHSA enrichment
  3. 2026-08-30 02:37 UTCEG score recompute
  4. 2026-08-30 02:37 UTCGHSA enrichment
  5. 2026-08-30 01:22 UTCEPSS rescore
  6. 2026-08-28 21:42 UTCEPSS rescore
  7. 2026-08-27 22:40 UTCEG score recompute
  8. 2026-08-27 22:40 UTCGHSA enrichment
  9. 2026-08-27 14:25 UTCEPSS rescore
  10. 2026-08-27 11:43 UTCGHSA enrichment
  11. 2026-08-26 22:37 UTCEG score recompute
  12. 2026-08-26 22:37 UTCGHSA enrichment
  13. 2026-08-26 14:46 UTCEPSS rescore
  14. 2026-08-26 11:40 UTCGHSA enrichment
  15. 2026-08-25 22:41 UTCEG score recompute
  16. 2026-08-25 22:41 UTCGHSA enrichment
  17. 2026-08-25 13:49 UTCEPSS rescore
  18. 2026-08-25 10:25 UTCGHSA enrichment
  19. 2026-08-24 23:28 UTCEG score recompute
  20. 2026-08-24 23:28 UTCGHSA enrichment
  21. 2026-08-24 12:31 UTCEG score recompute
  22. 2026-08-24 12:31 UTCGHSA enrichment
  23. 2026-08-24 01:34 UTCGHSA enrichment
  24. 2026-08-23 14:35 UTCGHSA enrichment
  25. 2026-08-23 03:38 UTCEG score recompute
  26. 2026-08-23 03:38 UTCGHSA enrichment
  27. 2026-08-23 00:19 UTCEPSS rescore
  28. 2026-08-22 16:41 UTCGHSA enrichment
  29. 2026-08-22 05:34 UTCEG score recompute
  30. 2026-08-22 05:34 UTCGHSA enrichment
  31. 2026-08-21 23:49 UTCEPSS rescore
  32. 2026-08-21 18:37 UTCGHSA enrichment
  33. 2026-08-21 07:40 UTCEG score recompute
  34. 2026-08-21 07:40 UTCGHSA enrichment
  35. 2026-08-20 22:55 UTCEPSS rescore
  36. 2026-08-20 20:43 UTCGHSA enrichment
  37. 2026-08-20 09:46 UTCGHSA enrichment
  38. 2026-08-19 22:50 UTCEG score recompute
  39. 2026-08-19 22:50 UTCGHSA enrichment
  40. 2026-08-19 17:04 UTCEPSS rescore
  41. 2026-08-19 06:50 UTCGHSA enrichment
  42. 2026-08-18 19:36 UTCEG score recompute
  43. 2026-08-18 19:36 UTCGHSA enrichment
  44. 2026-08-18 13:48 UTCEPSS rescore
  45. 2026-08-18 01:48 UTCGHSA enrichment
  46. 2026-08-17 14:00 UTCEG score recompute
  47. 2026-08-17 14:00 UTCGHSA enrichment
  48. 2026-08-17 13:47 UTCEPSS rescore
  49. 2026-08-17 03:04 UTCGHSA enrichment
  50. 2026-08-16 16:07 UTCEG score recompute
  51. 2026-08-16 16:07 UTCGHSA enrichment
  52. 2026-08-16 14:56 UTCEPSS rescore
  53. 2026-08-16 05:11 UTCEG score recompute
  54. 2026-08-16 05:10 UTCGHSA enrichment
  55. 2026-08-15 18:14 UTCGHSA enrichment
  56. 2026-08-15 07:17 UTCEG score recompute
  57. 2026-08-15 07:17 UTCGHSA enrichment
  58. 2026-08-15 01:30 UTCEPSS rescore
  59. 2026-08-14 19:50 UTCGHSA enrichment
  60. 2026-08-14 08:53 UTCEG score recompute
  61. 2026-08-14 08:53 UTCGHSA enrichment
  62. 2026-08-13 22:00 UTCEPSS rescore
  63. 2026-08-13 21:56 UTCGHSA enrichment
  64. 2026-08-13 10:59 UTCGHSA enrichment
  65. 2026-08-13 00:02 UTCEG score recompute
  66. 2026-08-13 00:02 UTCGHSA enrichment
  67. 2026-08-12 13:51 UTCEPSS rescore
  68. 2026-08-12 13:06 UTCGHSA enrichment
  69. 2026-08-12 02:09 UTCGHSA enrichment
  70. 2026-08-11 15:12 UTCEG score recompute
  71. 2026-08-11 15:12 UTCGHSA enrichment
  72. 2026-08-11 04:15 UTCEG score recompute
  73. 2026-08-11 04:15 UTCGHSA enrichment
  74. 2026-08-11 00:00 UTCEPSS rescore
  75. 2026-08-10 17:19 UTCGHSA enrichment

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 30, 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 1% probability of exploitation in the next 30 days, which ranks it in the top 41.5% 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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