CVE-2026-28755

MEDIUMNVD 5.45.4—
EchelonGraph scoreMEDIUM confidence

Score 5.4 from GitHub Security Advisory published 2026-03-24. NVD baseline CVSS 5.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.4Exploit: None knownExposed: 0

A fix is available — apply it.

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_stream_ssl_module module due to the improper handling of revoked certificates when configured with the ssl_verify_client on and ssl_ocsp on directives, allowing the TLS handshake to succeed even after an OCSP check identifies the certificate as revoked.  

Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

CVSS v3
5.4
EG Score
5.4(medium)
EG Risk
24(Track)
EG Risk 24/100SSVC: 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
Severity54% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

March 24, 2026

Last Modified

June 17, 2026

Advisory Details (1)

Auto-updated Aug 6, 2026
No patch confirmed yet.
generic

myF5

https://my.f5.com/manage/s/article/K000160368

Vendor Advisories for CVE-2026-28755(2)

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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatnginx-main-1.30.0-1.hum12026-04-15redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 4 ecosystems)
Alpine:v3.22(1)
PackageVulnerable rangeFixed inDependents
nginx—1.28.3-r0—
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
nginx—1.28.3-r0—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
nginx—1.28.3-r0—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
nginx1.26.3-3 ... 1.28.3-1 (15 versions)1.28.3-2—

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.

  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 19:27 UTCEPSS rescore
  3. 2026-09-17 19:30 UTCEPSS rescore
  4. 2026-09-16 14:08 UTCEPSS rescore
  5. 2026-09-13 16:47 UTCEPSS rescore
  6. 2026-09-12 15:01 UTCEPSS rescore
  7. 2026-09-10 09:34 UTCEPSS rescore
  8. 2026-09-08 22:00 UTCEPSS rescore
  9. 2026-09-07 16:01 UTCEPSS rescore
  10. 2026-09-06 13:47 UTCEPSS rescore
  11. 2026-09-06 13:47 UTCEPSS rescore
  12. 2026-09-04 05:06 UTCEPSS rescore
  13. 2026-09-02 16:08 UTCOSV refresh
  14. 2026-09-02 14:11 UTCEPSS rescore
  15. 2026-09-01 13:53 UTCEPSS rescore
  16. 2026-09-01 04:39 UTCEPSS rescore
  17. 2026-09-01 04:39 UTCEPSS rescore
  18. 2026-08-30 19:17 UTCEPSS rescore
  19. 2026-08-30 01:22 UTCEPSS rescore
  20. 2026-08-28 21:41 UTCEPSS rescore
  21. 2026-08-27 14:25 UTCEPSS rescore
  22. 2026-08-26 14:46 UTCEPSS rescore
  23. 2026-08-25 13:49 UTCEPSS rescore
  24. 2026-08-24 14:17 UTCEPSS rescore
  25. 2026-08-21 23:49 UTCEPSS rescore
Show 55 more
  1. 2026-08-20 22:55 UTCEPSS rescore
  2. 2026-08-20 22:55 UTCEPSS rescore
  3. 2026-08-19 17:03 UTCEPSS rescore
  4. 2026-08-18 13:48 UTCEPSS rescore
  5. 2026-08-17 13:47 UTCEPSS rescore
  6. 2026-08-16 14:56 UTCEPSS rescore
  7. 2026-08-16 10:39 UTCEG score recompute
  8. 2026-08-16 10:39 UTCVendor advisory
  9. 2026-08-16 10:38 UTCGHSA enrichment
  10. 2026-08-16 02:14 UTCEPSS rescore
  11. 2026-08-15 01:30 UTCEPSS rescore
  12. 2026-08-14 06:51 UTCEG score recompute
  13. 2026-08-14 06:51 UTCVendor advisory
  14. 2026-08-14 06:51 UTCGHSA enrichment
  15. 2026-08-13 22:00 UTCEPSS rescore
  16. 2026-08-12 21:30 UTCEG score recompute
  17. 2026-08-12 21:30 UTCVendor advisory
  18. 2026-08-12 21:30 UTCGHSA enrichment
  19. 2026-08-12 13:50 UTCEPSS rescore
  20. 2026-08-11 06:12 UTCEG score recompute
  21. 2026-08-11 06:12 UTCVendor advisory
  22. 2026-08-11 06:12 UTCGHSA enrichment
  23. 2026-08-11 00:00 UTCEPSS rescore
  24. 2026-08-10 06:23 UTCEG score recompute
  25. 2026-08-10 06:23 UTCVendor advisory
  26. 2026-08-10 06:23 UTCGHSA enrichment
  27. 2026-08-09 13:46 UTCEPSS rescore
  28. 2026-08-09 06:27 UTCEG score recompute
  29. 2026-08-09 06:27 UTCVendor advisory
  30. 2026-08-09 06:27 UTCGHSA enrichment
  31. 2026-08-08 16:37 UTCEPSS rescore
  32. 2026-08-07 16:48 UTCEG score recompute
  33. 2026-08-07 16:48 UTCVendor advisory
  34. 2026-08-07 16:48 UTCGHSA enrichment
  35. 2026-08-06 13:46 UTCEPSS rescore
  36. 2026-08-06 01:12 UTCEG score recompute
  37. 2026-08-06 01:12 UTCVendor advisory
  38. 2026-08-06 01:12 UTCGHSA enrichment
  39. 2026-08-05 19:17 UTCEPSS rescore
  40. 2026-08-03 23:56 UTCEG score recompute
  41. 2026-08-03 23:56 UTCVendor advisory
  42. 2026-08-03 23:56 UTCGHSA enrichment
  43. 2026-08-03 10:36 UTCEPSS rescore
  44. 2026-08-02 15:45 UTCEG score recompute
  45. 2026-08-02 15:45 UTCVendor advisory
  46. 2026-08-02 15:45 UTCGHSA enrichment
  47. 2026-08-02 02:26 UTCEPSS rescore
  48. 2026-08-01 04:16 UTCEPSS rescore
  49. 2026-07-30 16:27 UTCEPSS rescore
  50. 2026-07-30 01:30 UTCEPSS rescore
  51. 2026-07-28 15:36 UTCEPSS rescore
  52. 2026-07-27 12:50 UTCEG score recompute
  53. 2026-07-27 12:50 UTCVendor advisory
  54. 2026-07-27 12:50 UTCGHSA enrichment
  55. 2026-07-27 12:50 UTCOSV refresh

Frequently asked(5)

What is CVE-2026-28755?
CVE-2026-28755 is a medium vulnerability published on March 24, 2026. NGINX Plus and NGINX Open Source have a vulnerability in the ngxstreamsslmodule module due to the improper handling of revoked certificates when configured with the sslverifyclient on and sslocsp on directives, allowing the TLS handshake to succeed even after an OCSP check identifies the…
When was CVE-2026-28755 disclosed?
CVE-2026-28755 was first published in the National Vulnerability Database on March 24, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-28755 actively exploited?
CVE-2026-28755 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 96.8% of all scored CVEs.
What is the CVSS score of CVE-2026-28755?
CVE-2026-28755 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2026-28755?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-28755, 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-2026-28755

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