CVE-2026-56862

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-14. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — Patch released 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: 0.6%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Handshake messages, such as KeyUpdate, are always considered as state-advancing, regardless of whether a handshake has been completed or not. As a result, a malicious client can keep sending KeyUpdate messages to force the server to keep performing key derivation operations indefinitely.

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

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%
Exploitation1% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
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
0.6%
EPSS %ILE
45th
KEV
Not listed

CISA SSVCTrack 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). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 13, 2026

Last Modified

September 3, 2026

Advisory Details (4)

Auto-updated Aug 14, 2026
Patch available.
generic

GO-2026-6090 - Go Packages

https://pkg.go.dev/vuln/GO-2026-6090
generic
https://groups.google.com/g/golang-announce/c/94pEornpRlI
generic
https://go.dev/cl/804261
generic

crypto/tls: handshake messages can bypass non-advancing record limit in TLS 1.3 · Issue #80528 · golang/go · GitHub

https://go.dev/issue/80528

Vendor Advisories for CVE-2026-56862(20)

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

Patch Availability(27)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatose-gcp-gcr-image-credential-provider-0:4.18.0-202609081426.p2.g6ea2356.assembly.stream.el82026-10-01redhat
redhatquay/quay-rhel9:17906902982026-10-01redhat
redhatsatellite/iop-vmaas-rhel9:17908181572026-10-01redhat
redhatyggdrasil-worker-forwarder-0:0.1.0-2.1.el9sat2026-10-01redhat
redhatopenshift4/ose-vsphere-problem-detector-rhel9:17899037652026-10-01redhat
redhatopenshift4/ovirt-csi-driver-rhel8-operator:17899122742026-10-01redhat
redhatose-gcp-gcr-image-credential-provider-0:4.17.0-202609081428.p2.g8ce997d.assembly.stream.el82026-10-01redhat
redhatopenshift-clients-0:4.12.0-202609111749.p2.gd691257.assembly.stream.el82026-10-01redhat
redhatopenshift4/ose-vsphere-problem-detector-rhel9:17899376292026-10-01redhat
redhatrhoai/odh-kube-auth-proxy-rhel9:17901314762026-09-30redhat
redhatcompliance/openshift-file-integrity-rhel8-operator:17902892632026-09-30redhat
redhatmicroshift-0:4.22.16-202609250657.p0.g3898bb2.assembly.4.22.16.el92026-09-29redhat
redhatrh-lightspeed-runtimes/runtimes-inventory-rhel9-operator:17901941222026-09-29redhat
redhatcontainer-native-virtualization/kubemacpool-rhel9:17902517712026-09-29redhat
redhatopenshift-clients-0:4.22.0-202609170632.p2.gd0f23b1.assembly.stream.el82026-09-29redhat
redhatose-azure-acr-image-credential-provider-0:4.21.0-202609221600.p2.g53d73b1.assembly.stream.el102026-09-29redhat
redhatcontainer-native-virtualization/kubemacpool-rhel9:17900876512026-09-29redhat
redhatcontainer-native-virtualization/kubemacpool-rhel9:17902354632026-09-29redhat
redhatmulticluster-globalhub/multicluster-globalhub-agent-rhel9:17900854942026-09-29redhat
redhatcontainer-native-virtualization/kubemacpool-rhel9:17900603162026-09-29redhat
redhatmulticluster-globalhub/multicluster-globalhub-agent-rhel9:17906386122026-09-29redhat
redhatgit-lfs-0:2.13.3-3.el8_6.82026-09-28redhat
redhatmulticluster-engine/discovery-rhel9:17901176532026-09-28redhat
redhatmulticluster-engine/discovery-rhel9:17901262442026-09-28redhat
redhatmulticluster-engine/discovery-rhel9:17901345102026-09-28redhat
redhatgit-lfs-0:3.2.0-2.el8_8.82026-09-28redhat
redhatmulticluster-engine/discovery-rhel9:17901212872026-09-28redhat

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

(6 across 4 ecosystems)
Debian:14(3)
PackageVulnerable rangeFix by version rangeDependents
golang-1.251.25.0-1 ... 1.25.9-1 (20 versions)
  • every version on: no fix on record
—
golang-1.261.26.0-1 ... 1.26~rc3-2 (16 versions)
  • every version up to 1.26.6-1: fixed in 1.26.6-1
—
golang-1.271.27~rc1-1, 1.27~rc2-1
  • every version up to 1.27~rc3-1: fixed in 1.27~rc3-1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
golang-1.191.19.10-1 ... 1.19.9-1 (12 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
golang-1.241.24.12-1 ... 1.24.9-1 (10 versions)
  • every version on: no fix on record
—
Go(1)
PackageVulnerable rangeFix by version rangeDependents
stdlib—
  • every version up to 1.25.13: fixed in 1.25.13
  • 1.26.0-0 up to 1.26.6: fixed in 1.26.6
  • 1.27.0-0 up to 1.27.0-rc.3: fixed in 1.27.0-rc.3
—

Weakness Classification(1)

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

All Vendor Advisories

(25)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 30× in last 7d / 150× 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 280 total refreshes for this CVE.

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

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

Frequently asked(5)

What is CVE-2026-56862?
CVE-2026-56862 is a high vulnerability published on August 13, 2026. Handshake messages, such as KeyUpdate, are always considered as state-advancing, regardless of whether a handshake has been completed or not. As a result, a malicious client can keep sending KeyUpdate messages to force the server to keep performing key derivation operations indefinitely.
When was CVE-2026-56862 disclosed?
CVE-2026-56862 was first published on August 13, 2026, with the most recent update on September 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56862 actively exploited?
CVE-2026-56862 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (45th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-56862?
CVE-2026-56862 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-56862?
A fix for CVE-2026-56862 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-56862 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-56862

Explore →

Is Your Infrastructure Affected by CVE-2026-56862?

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

Book a Demo →Browse All CVEs