CVE-2026-56853

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: 1%CVSS: 7.5Exploit: None knownExposed: 0

A fix is available — apply it.

When a server is configured to support unencrypted HTTP/2, it reads a few bytes from each new connection to see if they contain the HTTP/2 client preface. ReadHeaderTimeout is unexpectedly not being applied when doing this.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity75% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
46%
KEV
Not listed

Published

August 13, 2026

Last Modified

September 3, 2026

Advisory Details (4)

Auto-updated Aug 14, 2026
No patch confirmed yet.
generic

GO-2026-6089 - Go Packages

https://pkg.go.dev/vuln/GO-2026-6089
generic
https://groups.google.com/g/golang-announce/c/94pEornpRlI
generic
https://go.dev/cl/795540
generic

net/http: enabling UnencryptedHTTP2 on Server disables first header read timeout · Issue #80205 · golang/go · GitHub

https://go.dev/issue/80205

Vendor Advisories for CVE-2026-56853(20)

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

Patch Availability(30)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatosbuild-composer-0:75-10.el8_82026-09-17redhat
redhatopentelemetry-collector-0:0.152.1-2.el9_42026-09-17redhat
redhatflightctl-0:1.2.1-1.el92026-09-16redhat
redhatopentelemetry-collector-0:0.152.1-2.el9_62026-09-16redhat
redhatopentelemetry-collector-0:0.152.1-2.el10_02026-09-16redhat
redhatflightctl-0:1.1.4-1.el9em2026-09-16redhat
redhatgrafana-0:10.2.6-26.el10_02026-09-15redhat
redhatgrafana-0:10.2.6-23.el9_62026-09-15redhat
redhatdelve-0:1.26.1-1.el9_4.12026-09-14redhat
redhatrhc-worker-playbook-0:0.2.10-2.el10_22026-09-14redhat
redhatdelve-0:1.26.1-1.el9_2.12026-09-14redhat
redhatgrafana-pcp-0:5.1.1-9.el9_42026-09-14redhat
redhatgrafana-pcp-0:5.1.1-5.el9_2.22026-09-14redhat
redhatdelve-0:1.26.1-1.el9_6.12026-09-14redhat
redhatgrafana-pcp-0:5.1.1-15.el9_6.12026-09-14redhat
redhatgrafana-pcp-0:5.3.0-1.el10_0.12026-09-11redhat
redhatosbuild-composer-0:134.1-12.el10_02026-09-10redhat
redhatexternal-secrets-operator/external-secrets-rhel9:17889639292026-09-10redhat
redhatopenshift-logging/eventrouter-rhel9:17883757962026-09-10redhat
redhatquay/quay-rhel8:17885943762026-09-10redhat
redhatignition-0:2.17.0-2.el9_4.22026-09-09redhat
redhatosbuild-composer-0:101.5-2.el8_102026-09-09redhat
redhatosbuild-composer-0:165.1-3.el10_2.22026-09-09redhat
redhatoadp/oadp-velero-rhel9:17888604612026-09-09redhat
redhatquay/quay-rhel8:17885618412026-09-09redhat
redhatimage-builder-0:52.1-1.el9_8.22026-09-09redhat
redhatdelve-0:1.26.1-2.el10_02026-09-09redhat
redhatimage-builder-0:52.1-1.el10_2.22026-09-08redhat
redhatignition-0:2.21.0-7.el9_6.12026-09-08redhat
redhatopenshift-service-mesh/istio-rhel9-operator:17883336182026-09-08redhat

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 rangeFixed inDependents
golang-1.251.25.0-1 ... 1.25.9-1 (20 versions)——
golang-1.261.26.0-1 ... 1.26~rc3-2 (16 versions)1.26.6-1—
golang-1.271.27~rc1-1, 1.27~rc2-11.27~rc3-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
golang-1.191.19.10-1 ... 1.19.9-1 (12 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
golang-1.241.24.12-1 ... 1.24.9-1 (10 versions)——
Go(1)
PackageVulnerable rangeFixed inDependents
stdlib—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 39× in last 7d / 160× 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 195 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-56853?
CVE-2026-56853 is a high vulnerability published on August 13, 2026. When a server is configured to support unencrypted HTTP/2, it reads a few bytes from each new connection to see if they contain the HTTP/2 client preface. ReadHeaderTimeout is unexpectedly not being applied when doing this.
When was CVE-2026-56853 disclosed?
CVE-2026-56853 was first published in the National Vulnerability Database 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-2026-56853 actively exploited?
CVE-2026-56853 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 54.2% of all scored CVEs.
What is the CVSS score of CVE-2026-56853?
CVE-2026-56853 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-56853?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56853, 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-2026-56853

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