CVE-2026-56434

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory (severity: HIGH) published 2026-07-15. a secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 0

A fix is available — apply it.

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_ssi_module module. This vulnerability may exist when the Server-Side Includes (SSI), proxy_pass, and proxy_buffering off directives are configured. With this configuration, an unauthenticated attacker with man-in-the-middle (MITM) ability to control responses from an upstream server may be able to cause a use-after-free in the NGINX worker process. This issue may lead to limited modification of memory or a restart of the NGINX worker process.

Impact: This vulnerability may allow remote attackers to have limited control to modify memory contents or restart the NGINX worker process. There is no control plane exposure; this is a data plane issue only.

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

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
38%
KEV
Not listed

Published

July 15, 2026

Last Modified

August 10, 2026

Advisory Details (1)

Auto-updated Jul 15, 2026
No patch confirmed yet.
generic

myF5

https://my.f5.com/manage/s/article/K000162098

Vendor Advisories for CVE-2026-56434(6)

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

Patch Availability(9)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntunginx-light (1.28.3-2ubuntu1.7) @ resolute2026-09-18ubuntu
redhatrhui5/rhua-rhel9:17888805812026-09-09redhat
redhatdiscovery/discovery-ui-rhel9:17882061962026-08-31redhat
redhatnginx:1.26-9080020260803214158.92026-08-25redhat
redhatnginx-2:1.20.1-28.el9_8.52026-08-25redhat
redhatnginx:1.24-9080020260804072754.92026-08-25redhat
redhatnginx:1.24-8100020260809162034.489197e62026-08-24redhat
redhatnginx-2:1.26.3-6.el10_2.62026-08-24redhat
redhatnginx-main-1.30.4-2.hum12026-07-26redhat

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

(8 across 8 ecosystems)
Alpine:v3.21(1)
PackageVulnerable rangeFixed inDependents
nginx—1.26.3-r2—
Alpine:v3.22(1)
PackageVulnerable rangeFixed inDependents
nginx—1.28.3-r6—
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
nginx—1.28.3-r6—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
nginx—1.30.4-r0—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
nginx1.18.0-6.1 ... 1.30.4-3 (80 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
nginx1.22.1-9 ... 1.30.4-5 (52 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
nginx1.26.3-3 ... 1.30.4-5 (39 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
nginx1.26.3-3 ... 1.30.1-6 (26 versions)1.30.1-7—

Weakness Classification(1)

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

Additional Vendor Advisories

(5)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 15× in last 7d / 71× 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 176 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-56434?
CVE-2026-56434 is a medium vulnerability published on July 15, 2026. NGINX Plus and NGINX Open Source have a vulnerability in the ngxhttpssimodule module. This vulnerability may exist when the Server-Side Includes (SSI), proxypass, and proxy_buffering off directives are configured. With this configuration, an unauthenticated attacker with man-in-the-middle (MITM)…
When was CVE-2026-56434 disclosed?
CVE-2026-56434 was first published in the National Vulnerability Database on July 15, 2026, with the most recent update on August 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56434 actively exploited?
CVE-2026-56434 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 61.5% of all scored CVEs.
What is the CVSS score of CVE-2026-56434?
CVE-2026-56434 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-56434?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56434, 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-2026-56434

Explore →

Is Your Infrastructure Affected by CVE-2026-56434?

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

Start Free Scan →Browse All CVEs