CVE-2026-73564

HIGHPre-NVD 8.78.7—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (42nd percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Elevated
8.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 8.7Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

frp is a fast reverse proxy. From 0.53.0 until 0.70.1, frp's optional SSH Tunnel Gateway in pkg/ssh/server.go parses an SSH exec channel request by adding 4 to an attacker-controlled four-byte big-endian length. A length of 0xFFFFFFFF makes the uint32 addition wrap to 3, defeats the payload bounds check, and causes payload[4:3] to panic in TunnelServer.handleNewChannel. When no authorized-keys file is configured, sshConfig.NoClientAuth permits an unauthenticated peer to reach this channel phase before the frp token is checked, so a single five-byte request terminates the frps process and drops every active tunnel. This issue is fixed in version 0.70.1.

CVSS v3
8.7
EG Score
8.7HIGHmedium confidence
EG Risk
70
EG Risk 70/100CISA 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
Severity87% × 45%
Exploitation40% × 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
0.5%
EPSS %ILE
42nd
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 public PoC (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 18, 2026

Advisory Details (4)

Auto-updated Aug 13, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github_release, github, github_pr.
github_release Patch Available

v0.70.1

Patch available: fatedier/frp v0.70.1

https://github.com/fatedier/frp/releases/tag/v0.70.1
github_commit

commit 7dc7be930e24 (fatedier/frp)

Fix landed in fatedier/frp commit 7dc7be930e24 — awaiting tagged release

https://github.com/fatedier/frp/commit/7dc7be930e2452ae93fd32f2a77f8c6fcd0b652b
github_pr

ssh: fix malformed exec payload panic

Fix merged in fatedier/frp PR #5428 on 2026-07-21 — awaiting tagged release

https://github.com/fatedier/frp/pull/5428
githubMentions a patch (unverified)🟡 PoC Available

Unauthenticated Remote Denial of Service in the frp SSH Tunnel Gateway via Integer Overflow · Advisory · fatedier/frp · GitHub

https://github.com/fatedier/frp/security/advisories/GHSA-26gq-p25f-99cp

Vendor Advisories for CVE-2026-73564(1)

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

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFix by version rangeDependents
github.com/fatedier/frp—
  • 0.53.0 up to 0.70.1: fixed in 0.70.1
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 44× 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.

  1. 2026-10-10 20:00 UTCEPSS rescore
  2. 2026-10-09 20:07 UTCEPSS rescore
  3. 2026-10-08 17:13 UTCEPSS rescore
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  5. 2026-10-07 01:20 UTCEG score recompute
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  10. 2026-10-04 23:22 UTCEPSS rescore
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  24. 2026-09-25 03:32 UTCEG score recompute
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  1. 2026-09-23 17:54 UTCEPSS rescore
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  3. 2026-09-21 21:50 UTCEG score recompute
  4. 2026-09-21 21:09 UTCEPSS rescore
  5. 2026-09-19 20:37 UTCEG score recompute
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  7. 2026-09-18 19:28 UTCEPSS rescore
  8. 2026-09-18 00:26 UTCEG score recompute
  9. 2026-09-16 23:59 UTCEG score recompute
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  21. 2026-09-10 09:35 UTCEPSS rescore
  22. 2026-09-09 04:56 UTCEG score recompute
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  24. 2026-09-07 17:35 UTCEG score recompute
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  26. 2026-09-06 13:48 UTCEPSS rescore
  27. 2026-09-05 15:45 UTCEG score recompute
  28. 2026-09-04 16:01 UTCEG score recompute
  29. 2026-09-04 05:07 UTCEPSS rescore
  30. 2026-09-03 01:02 UTCEG score recompute
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  34. 2026-08-30 20:10 UTCEG score recompute
  35. 2026-08-30 19:18 UTCEPSS rescore
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  40. 2026-08-28 21:42 UTCEPSS rescore
  41. 2026-08-27 19:32 UTCEG score recompute
  42. 2026-08-27 14:25 UTCEPSS rescore
  43. 2026-08-26 18:43 UTCEG score recompute
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  45. 2026-08-25 17:12 UTCEG score recompute
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  47. 2026-08-24 17:14 UTCEG score recompute
  48. 2026-08-23 05:23 UTCEG score recompute
  49. 2026-08-23 00:19 UTCEPSS rescore
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  57. 2026-08-18 13:49 UTCEPSS rescore
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  59. 2026-08-17 17:15 UTCEG score recompute
  60. 2026-08-17 13:47 UTCEPSS rescore
  61. 2026-08-16 17:25 UTCEG score recompute
  62. 2026-08-16 14:56 UTCEPSS rescore
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  64. 2026-08-16 05:33 UTCEG score recompute
  65. 2026-08-16 02:15 UTCEPSS rescore
  66. 2026-08-15 05:52 UTCEG score recompute
  67. 2026-08-15 01:31 UTCEPSS rescore
  68. 2026-08-14 06:09 UTCEG score recompute
  69. 2026-08-13 18:18 UTCEG score recompute
  70. 2026-08-13 18:12 UTCEG score recompute
  71. 2026-08-13 17:47 UTCEG score recompute
  72. 2026-08-13 17:46 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same CWE)

Same product

1 shown

Go:github.com/fatedier/frp

Frequently asked(5)

What is CVE-2026-73564?
CVE-2026-73564 is a high vulnerability published on August 13, 2026. frp is a fast reverse proxy. From 0.53.0 until 0.70.1, frp's optional SSH Tunnel Gateway in pkg/ssh/server.go parses an SSH exec channel request by adding 4 to an attacker-controlled four-byte big-endian length. A length of 0xFFFFFFFF makes the uint32 addition wrap to 3, defeats the payload bounds…
When was CVE-2026-73564 disclosed?
CVE-2026-73564 was first published on August 13, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-73564 actively exploited?
CVE-2026-73564 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (42nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-73564?
CVE-2026-73564 has a CVSS base score of 8.7 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-73564?
A fix for CVE-2026-73564 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-73564 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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