CVE-2026-19538

HIGHNVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-01. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

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

The BLOCKED access control list items that are evaluated to deny access on the the proxy protocol port can be bypassed completely when connecting over TCP or TLS and sending the query twice on connection that is kept open.

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
34(Track)
EG Risk 34/100SSVC: 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
Severity75% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
23%
KEV
Not listed

Published

August 26, 2026

Last Modified

September 8, 2026

Advisory Details (1)

Auto-updated Aug 26, 2026
No patch confirmed yet.
generic
https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-19538.txt

Vendor Advisories for CVE-2026-19538(1)

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

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
nsd4.10.1-1 ... 4.9.1-1 (24 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
nsd4.12.0-1 ... 4.15.1-1 (15 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
nsd4.12.0-1 ... 4.15.0~rc1-1 (14 versions)4.15.1-1—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 27× in last 7d / 86× 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. 2026-09-19 06:06 UTCEG score recompute
  2. 2026-09-19 06:06 UTCGHSA enrichment
  3. 2026-09-18 19:27 UTCEPSS rescore
  4. 2026-09-18 19:03 UTCGHSA enrichment
  5. 2026-09-18 08:01 UTCGHSA enrichment
  6. 2026-09-17 20:59 UTCEG score recompute
  7. 2026-09-17 20:59 UTCGHSA enrichment
  8. 2026-09-17 06:12 UTCGHSA enrichment
  9. 2026-09-16 19:09 UTCEG score recompute
  10. 2026-09-16 19:09 UTCGHSA enrichment
  11. 2026-09-16 14:07 UTCEPSS rescore
  12. 2026-09-16 05:32 UTCEG score recompute
  13. 2026-09-16 05:32 UTCGHSA enrichment
  14. 2026-09-16 05:14 UTCEPSS rescore
  15. 2026-09-15 18:30 UTCGHSA enrichment
  16. 2026-09-15 06:51 UTCEG score recompute
  17. 2026-09-15 06:51 UTCGHSA enrichment
  18. 2026-09-14 19:48 UTCGHSA enrichment
  19. 2026-09-14 08:45 UTCGHSA enrichment
  20. 2026-09-13 21:43 UTCEG score recompute
  21. 2026-09-13 21:43 UTCGHSA enrichment
  22. 2026-09-13 16:46 UTCEPSS rescore
  23. 2026-09-13 10:41 UTCGHSA enrichment
  24. 2026-09-12 23:39 UTCEG score recompute
  25. 2026-09-12 23:39 UTCGHSA enrichment
Show 61 more
  1. 2026-09-12 15:00 UTCEPSS rescore
  2. 2026-09-12 12:37 UTCGHSA enrichment
  3. 2026-09-12 01:35 UTCEG score recompute
  4. 2026-09-12 01:35 UTCGHSA enrichment
  5. 2026-09-11 14:52 UTCEPSS rescore
  6. 2026-09-11 14:33 UTCEG score recompute
  7. 2026-09-11 14:33 UTCGHSA enrichment
  8. 2026-09-11 09:36 UTCEPSS rescore
  9. 2026-09-11 03:31 UTCGHSA enrichment
  10. 2026-09-10 16:29 UTCEG score recompute
  11. 2026-09-10 16:29 UTCGHSA enrichment
  12. 2026-09-10 09:34 UTCEPSS rescore
  13. 2026-09-10 05:27 UTCGHSA enrichment
  14. 2026-09-09 18:25 UTCGHSA enrichment
  15. 2026-09-09 07:22 UTCEG score recompute
  16. 2026-09-09 07:22 UTCGHSA enrichment
  17. 2026-09-08 22:00 UTCEPSS rescore
  18. 2026-09-08 20:20 UTCEG score recompute▼ 0.70
  19. 2026-09-08 20:20 UTCGHSA enrichment
  20. 2026-09-08 20:10 UTCNVD updateCVSS v3 → 7.5
  21. 2026-09-08 11:28 UTCGHSA enrichment
  22. 2026-09-07 22:32 UTCEG score recompute
  23. 2026-09-07 22:32 UTCGHSA enrichment
  24. 2026-09-07 16:01 UTCEPSS rescore
  25. 2026-09-07 11:30 UTCGHSA enrichment
  26. 2026-09-07 00:23 UTCEG score recompute
  27. 2026-09-07 00:23 UTCGHSA enrichment
  28. 2026-09-06 13:47 UTCEPSS rescore
  29. 2026-09-06 13:18 UTCGHSA enrichment
  30. 2026-09-06 02:16 UTCEG score recompute
  31. 2026-09-06 02:16 UTCGHSA enrichment
  32. 2026-09-05 15:14 UTCGHSA enrichment
  33. 2026-09-05 04:11 UTCGHSA enrichment
  34. 2026-09-04 17:09 UTCEG score recompute
  35. 2026-09-04 17:08 UTCGHSA enrichment
  36. 2026-09-04 06:05 UTCEG score recompute
  37. 2026-09-04 06:05 UTCGHSA enrichment
  38. 2026-09-04 05:06 UTCEPSS rescore
  39. 2026-09-03 19:00 UTCGHSA enrichment
  40. 2026-09-03 07:46 UTCGHSA enrichment
  41. 2026-09-02 20:35 UTCEG score recompute
  42. 2026-09-02 20:35 UTCGHSA enrichment
  43. 2026-09-02 14:11 UTCEPSS rescore
  44. 2026-09-02 08:13 UTCGHSA enrichment
  45. 2026-09-01 16:36 UTCEG score recompute
  46. 2026-09-01 13:53 UTCEPSS rescore
  47. 2026-09-01 05:29 UTCEG score recompute
  48. 2026-09-01 04:39 UTCEPSS rescore
  49. 2026-08-30 20:11 UTCEG score recompute
  50. 2026-08-30 19:17 UTCEPSS rescore
  51. 2026-08-30 09:09 UTCEG score recompute
  52. 2026-08-30 01:22 UTCEPSS rescore
  53. 2026-08-28 23:59 UTCEG score recompute
  54. 2026-08-28 21:41 UTCEPSS rescore
  55. 2026-08-28 01:02 UTCEG score recompute
  56. 2026-08-27 14:25 UTCEPSS rescore
  57. 2026-08-26 15:54 UTCEG score recompute
  58. 2026-08-26 14:46 UTCEPSS rescore
  59. 2026-08-26 14:08 UTCEG score recompute
  60. 2026-08-26 09:10 UTCEG score recompute
  61. 2026-08-26 09:08 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-19538?
CVE-2026-19538 is a high vulnerability published on August 26, 2026. The BLOCKED access control list items that are evaluated to deny access on the the proxy protocol port can be bypassed completely when connecting over TCP or TLS and sending the query twice on connection that is kept open.
When was CVE-2026-19538 disclosed?
CVE-2026-19538 was first published in the National Vulnerability Database on August 26, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-19538 actively exploited?
CVE-2026-19538 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 76.9% of all scored CVEs.
What is the CVSS score of CVE-2026-19538?
CVE-2026-19538 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-19538?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-19538, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-19538

Explore →

Is Your Infrastructure Affected by CVE-2026-19538?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs