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(8)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntunginx-light (1.24.0-2ubuntu7.14) @ noble2026-09-08ubuntu
redhatdiscovery/discovery-ui-rhel9:17882061962026-08-31redhat
redhatnginx:1.24-9080020260804072754.92026-08-25redhat
redhatnginx-2:1.20.1-28.el9_8.52026-08-25redhat
redhatnginx:1.26-9080020260803214158.92026-08-25redhat
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 11× in last 7d / 80× 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 158 total refreshes for this CVE.

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

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 62.1% 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

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