CVE-2026-42167

HIGHPre-NVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-04-29. a secondary CVSS source baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Elevated
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 7%CVSS: 8.1Exploit: Elevated riskExposed: 0

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

mod_sql in ProFTPD before 1.3.9a allows remote attackers to execute arbitrary code via a username, in scenarios where there is logging of USER requests with an expansion such as %U, and the SQL backend allows commands (e.g., COPY TO PROGRAM).

CVSS v3
8.1
EG Score
8.1(medium)
EG Risk
52(Track*)
EG Risk 52/100SSVC: 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
Severity81% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
7%
EPSS %ILE
94%
KEV
Not listed

Published

April 28, 2026

Last Modified

July 24, 2026

Advisory Details (4)

Auto-updated Apr 29, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

GitHub - ZeroPathAI/proftpd-CVE-2026-42167-poc: POCs to demonstrate CVE-2026-42167 in ProFTPD · GitHub

https://github.com/ZeroPathAI/proftpd-CVE-2026-42167-poc
generic

CVE-2026-42167 Allows Auth Bypass And RCE In ProFTPD - ZeroPath Blog | ZeroPath

https://zeropath.com/blog/proftpd-cve-2026-42167-auth-bypass-privesc-rce
generic

SQL injection possible via mod_sql because of is_escaped_text() logic error · Issue #2052 · proftpd/proftpd · GitHub

https://github.com/proftpd/proftpd/issues/2052
generic
http://www.proftpd.org/docs/RELEASE_NOTES-1.3.10rc1

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, 1.3.8+dfsg-4+deb12u1, 1.3.8+dfsg-4+deb12u2, 1.3.8+dfsg-4+deb12u3, 1.3.8+dfsg-4+deb12u41.3.8+dfsg-4+deb12u5—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
proftpd-dfsg1.3.8.c+dfsg-4, 1.3.8.c+dfsg-4+deb13u11.3.8.c+dfsg-4+deb13u2—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
proftpd-dfsg1.3.8.c+dfsg-4, 1.3.9~dfsg-1, 1.3.9~dfsg-2, 1.3.9~dfsg-3, 1.3.9~dfsg-41.3.9~dfsg-5—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 27× 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 192 total refreshes for this CVE.

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

Publicly available exploits

(4 references)

Working exploit code is in the public domain (2 GitHub PoCs) (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-52658
    First seen Aug 25, 2026

    CVE-2026-42167 - ProFTPD mod_sql post-authentication SQLi - RCE

    Open source ↗
  • GitHub PoCdinosn/proftpd-CVE-2026-42167-analysis
    First seen Apr 29, 2026

    Independent reproduction, code-level root-cause analysis, and realistic-exposure write-up for CVE-2026-42167 (ProFTPD mod_sql is_escaped_text() bypass).

    Open source ↗
  • GitHub PoCZeroPathAI/proftpd-CVE-2026-42167-poc
    First seen Apr 28, 2026

    POCs to demonstrate CVE-2026-42167 in ProFTPD

    Open source ↗
  • Nucleinetwork/cves/2026/CVE-2026-42167.yaml
    First seen Jan 1, 2026

    ProFTPD mod_sql - Preauth User Backdoor

    Open source ↗

Frequently asked(5)

What is CVE-2026-42167?
CVE-2026-42167 is a high vulnerability published on April 28, 2026. mod_sql in ProFTPD before 1.3.9a allows remote attackers to execute arbitrary code via a username, in scenarios where there is logging of USER requests with an expansion such as %U, and the SQL backend allows commands (e.g., COPY TO PROGRAM).
When was CVE-2026-42167 disclosed?
CVE-2026-42167 was first published in the National Vulnerability Database on April 28, 2026, with the most recent update on July 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42167 actively exploited?
CVE-2026-42167 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 7% probability of exploitation in the next 30 days, which ranks it in the top 5.9% of all scored CVEs.
What is the CVSS score of CVE-2026-42167?
CVE-2026-42167 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-42167?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42167, 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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