CVE-2026-56854

HIGHPre-NVD 7.57.5
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-28. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: CISA-ADP (Vulnrichment) CVSS v3.1, EPSS, GitHub Security Advisory
Trending — 4 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

The source-address critical option in the Permissions returned by an authentication callback was only enforced for the PublicKeyCallback and VerifiedPublicKeyCallback paths, extending the fix for CVE-2026-46595. Permissions returned by the PasswordCallback, KeyboardInteractiveCallback, NoClientAuthCallback, and GSSAPIWithMICConfig.AllowLogin callbacks were not validated against the client's remote address, so a source-address restriction set by those callbacks was silently ignored. The check is now applied to the Permissions returned by any authentication callback.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100

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 (value × EchelonGraph’s weight)
Severity75% × 45%
The EG Score, 7.5 of 10.
Exploitation0.4% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.4%
EPSS %ILE
36th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 28, 2026

Last Modified

September 3, 2026

Advisory Details (3)

Auto-updated Aug 28, 2026
Patch available.
Web page

GO-2026-6303 - Go Packages

https://pkg.go.dev/vuln/GO-2026-6303
Web page

x/crypto/ssh: source-address restriction bypassed in 5 callback families · Issue #80213 · golang/go · GitHub

https://go.dev/issue/80213
Web page
https://go.dev/cl/797040

Vendor Advisories for CVE-2026-56854(18)

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

Patch Availability(15)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatopenshift-gitops-1/argocd-rhel9:17912520922026-10-07redhat
redhatopenshift-gitops-1/argocd-rhel9:17911843782026-10-07redhat
redhatcert-manager/cert-manager-istio-csr-rhel9:17902237192026-09-28redhat
redhatcert-manager/cert-manager-operator-rhel9:17902724262026-09-28redhat
redhatcert-manager/cert-manager-istio-csr-rhel9:17905899142026-09-28redhat
redhatcert-manager/cert-manager-operator-rhel9:17905898552026-09-28redhat
redhatcert-manager/jetstack-cert-manager-rhel9:17905899122026-09-28redhat
redhatcert-manager/jetstack-cert-manager-rhel9:17902232792026-09-28redhat
redhatrhtas/rekor-monitor-rhel9:17896551272026-09-23redhat
redhatrhtas/rekor-server-rhel9:17896457762026-09-23redhat
redhatrhtas/rekor-cli-rhel9:17896457762026-09-23redhat
redhatopenshift-builds/openshift-builds-webhook-rhel9:17899763002026-09-22redhat
redhatopenshift-builds/openshift-builds-webhook-rhel10:17899755562026-09-22redhat
redhatrhosdt/opentelemetry-collector-rhel9:17896465032026-09-21redhat
redhatcryostat/cryostat-storage-rhel9:4.2.0-222026-09-16redhat

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)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
golang-go.crypto1:0.10.0-1 ... 1:0.56.0-1 (36 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
golang-go.crypto1:0.25.0-1 ... 1:0.56.0-1 (21 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
golang-go.crypto1:0.25.0-1 ... 1:0.54.0-1 (19 versions)
  • every version up to 1:0.55.0-1: fixed in 1:0.55.0-1
—
Go(1)
PackageVulnerable rangeFix by version rangeDependents
golang.org/x/crypto—
  • every version up to 0.55.0: fixed in 0.55.0
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 24× in last 7d / 142× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 207 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 107 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  3. 2026-10-12 15:54 UTCEG score recompute
  4. 2026-10-11 19:37 UTCEG score recompute
  5. 2026-10-11 16:53 UTCEG score recompute
  6. 2026-10-11 14:15 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  9. 2026-10-10 13:38 UTCVendor advisory
  10. 2026-10-10 13:38 UTCGHSA enrichmentGHSA-gjhq-gjfw-99mq · GitHub severity HIGH · GitHub CVSS 7.5
  11. 2026-10-10 00:54 UTCEG score recompute
  12. 2026-10-10 00:54 UTCVendor advisory
  13. 2026-10-10 00:54 UTCGHSA enrichmentGHSA-gjhq-gjfw-99mq · GitHub severity HIGH · GitHub CVSS 7.5
  14. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  15. 2026-10-09 02:41 UTCEG score recompute
  16. 2026-10-09 02:41 UTCVendor advisory
  17. 2026-10-09 02:41 UTCGHSA enrichmentGHSA-gjhq-gjfw-99mq · GitHub severity HIGH · GitHub CVSS 7.5
  18. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  19. 2026-10-08 00:52 UTCEG score recompute
  20. 2026-10-08 00:52 UTCVendor advisory
  21. 2026-10-08 00:52 UTCGHSA enrichmentGHSA-gjhq-gjfw-99mq · GitHub severity HIGH · GitHub CVSS 7.5
  22. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  23. 2026-10-07 09:09 UTCVendor advisory
  24. 2026-10-07 09:09 UTCGHSA enrichmentGHSA-gjhq-gjfw-99mq · GitHub severity HIGH · GitHub CVSS 7.5
  25. 2026-10-06 20:28 UTCEG score recompute
Show 75 more
  1. 2026-10-06 20:28 UTCVendor advisory
  2. 2026-10-06 20:28 UTCGHSA enrichmentGHSA-gjhq-gjfw-99mq · GitHub severity HIGH · GitHub CVSS 7.5
  3. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  4. 2026-10-06 07:28 UTCEG score recompute
  5. 2026-10-06 07:28 UTCVendor advisory
  6. 2026-10-06 07:28 UTCGHSA enrichmentGHSA-gjhq-gjfw-99mq · GitHub severity HIGH · GitHub CVSS 7.5
  7. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  8. 2026-10-05 17:11 UTCVendor advisory
  9. 2026-10-05 17:11 UTCGHSA enrichmentGHSA-gjhq-gjfw-99mq · GitHub severity HIGH · GitHub CVSS 7.5
  10. 2026-10-05 04:30 UTCEG score recompute
  11. 2026-10-05 04:30 UTCVendor advisory
  12. 2026-10-05 04:30 UTCGHSA enrichmentGHSA-gjhq-gjfw-99mq · GitHub severity HIGH · GitHub CVSS 7.5
  13. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  14. 2026-10-04 15:33 UTCVendor advisory
  15. 2026-10-04 15:33 UTCGHSA enrichmentGHSA-gjhq-gjfw-99mq · GitHub severity HIGH · GitHub CVSS 7.5
  16. 2026-10-04 02:22 UTCEG score recompute
  17. 2026-10-04 02:22 UTCVendor advisory
  18. 2026-10-04 02:22 UTCGHSA enrichmentGHSA-gjhq-gjfw-99mq · GitHub severity HIGH · GitHub CVSS 7.5
  19. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  20. 2026-10-03 13:42 UTCVendor advisory
  21. 2026-10-03 13:42 UTCGHSA enrichmentGHSA-gjhq-gjfw-99mq · GitHub severity HIGH · GitHub CVSS 7.5
  22. 2026-10-02 22:54 UTCEG score recompute
  23. 2026-10-02 22:54 UTCVendor advisory
  24. 2026-10-02 22:54 UTCGHSA enrichmentGHSA-gjhq-gjfw-99mq · GitHub severity HIGH · GitHub CVSS 7.5
  25. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  26. 2026-10-02 10:02 UTCVendor advisory
  27. 2026-10-02 10:02 UTCGHSA enrichmentGHSA-gjhq-gjfw-99mq · GitHub severity HIGH · GitHub CVSS 7.5
  28. 2026-10-01 21:22 UTCEG score recompute
  29. 2026-10-01 21:22 UTCVendor advisory
  30. 2026-10-01 21:22 UTCGHSA enrichmentGHSA-gjhq-gjfw-99mq · GitHub severity HIGH · GitHub CVSS 7.5
  31. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  32. 2026-10-01 08:32 UTCVendor advisory
  33. 2026-10-01 08:32 UTCGHSA enrichmentGHSA-gjhq-gjfw-99mq · GitHub severity HIGH · GitHub CVSS 7.5
  34. 2026-09-30 19:49 UTCEG score recompute
  35. 2026-09-30 19:49 UTCVendor advisory
  36. 2026-09-30 19:49 UTCGHSA enrichmentGHSA-gjhq-gjfw-99mq · GitHub severity HIGH · GitHub CVSS 7.5
  37. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  38. 2026-09-30 03:50 UTCEG score recompute
  39. 2026-09-30 03:50 UTCVendor advisory
  40. 2026-09-30 03:50 UTCGHSA enrichmentGHSA-gjhq-gjfw-99mq · GitHub severity HIGH · GitHub CVSS 7.5
  41. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  42. 2026-09-29 12:20 UTCVendor advisory
  43. 2026-09-29 12:20 UTCGHSA enrichmentGHSA-gjhq-gjfw-99mq · GitHub severity HIGH · GitHub CVSS 7.5
  44. 2026-09-28 23:40 UTCEG score recompute
  45. 2026-09-28 23:40 UTCVendor advisory
  46. 2026-09-28 23:40 UTCGHSA enrichmentGHSA-gjhq-gjfw-99mq · GitHub severity HIGH · GitHub CVSS 7.5
  47. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  48. 2026-09-28 10:58 UTCVendor advisory
  49. 2026-09-28 10:58 UTCGHSA enrichmentGHSA-gjhq-gjfw-99mq · GitHub severity HIGH · GitHub CVSS 7.5
  50. 2026-09-27 22:17 UTCEG score recompute
  51. 2026-09-27 22:17 UTCVendor advisory
  52. 2026-09-27 22:17 UTCGHSA enrichmentGHSA-gjhq-gjfw-99mq · GitHub severity HIGH · GitHub CVSS 7.5
  53. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  54. 2026-09-27 09:36 UTCVendor advisory
  55. 2026-09-27 09:36 UTCGHSA enrichmentGHSA-gjhq-gjfw-99mq · GitHub severity HIGH · GitHub CVSS 7.5
  56. 2026-09-26 20:55 UTCEG score recompute
  57. 2026-09-26 20:55 UTCVendor advisory
  58. 2026-09-26 20:55 UTCGHSA enrichmentGHSA-gjhq-gjfw-99mq · GitHub severity HIGH · GitHub CVSS 7.5
  59. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  60. 2026-09-26 08:08 UTCEG score recompute
  61. 2026-09-26 08:08 UTCVendor advisory
  62. 2026-09-26 08:07 UTCGHSA enrichmentGHSA-gjhq-gjfw-99mq · GitHub severity HIGH · GitHub CVSS 7.5
  63. 2026-09-25 11:30 UTCVendor advisory
  64. 2026-09-25 11:29 UTCGHSA enrichmentGHSA-gjhq-gjfw-99mq · GitHub severity HIGH · GitHub CVSS 7.5
  65. 2026-09-24 22:07 UTCEG score recompute
  66. 2026-09-24 22:07 UTCVendor advisory
  67. 2026-09-24 22:07 UTCGHSA enrichmentGHSA-gjhq-gjfw-99mq · GitHub severity HIGH · GitHub CVSS 7.5
  68. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  69. 2026-09-24 09:23 UTCVendor advisory
  70. 2026-09-24 09:23 UTCGHSA enrichmentGHSA-gjhq-gjfw-99mq · GitHub severity HIGH · GitHub CVSS 7.5
  71. 2026-09-23 20:42 UTCEG score recompute
  72. 2026-09-23 20:42 UTCVendor advisory
  73. 2026-09-23 20:42 UTCGHSA enrichmentGHSA-gjhq-gjfw-99mq · GitHub severity HIGH · GitHub CVSS 7.5
  74. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  75. 2026-09-23 08:01 UTCVendor advisory

Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-56854?
CVE-2026-56854 is a high-severity vulnerability; its CVE record was published on August 28, 2026. The source-address critical option in the Permissions returned by an authentication callback was only enforced for the PublicKeyCallback and VerifiedPublicKeyCallback paths, extending the fix for CVE-2026-46595. Permissions returned by the PasswordCallback, KeyboardInteractiveCallback,…
When was the CVE record for CVE-2026-56854 published?
The CVE record for CVE-2026-56854 was published on August 28, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 3, 2026; the record at its source may have been updated since.
Is CVE-2026-56854 actively exploited?
CVE-2026-56854 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (36th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-56854?
CVE-2026-56854 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-56854?
A fix for CVE-2026-56854 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-56854 are linked in the Vendor Advisories panel on this page.

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