CVE-2026-73489

MEDIUMPre-NVD 4.34.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 4.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (36th 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
4.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 4.3Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

Russh is a Rust SSH client & server library. Prior to 0.62.4, an authenticated SSH client can cause a denial of service by sending a pty-req channel request with more than 130 terminal-mode records. The parser in russh/src/server/encrypted.rs stores terminal modes in a fixed 130-entry [(Pty::TTY_OP_END, 0); 130] array but continues increasing the mode count, then constructs an out-of-bounds slice and panics before the application pty_request handler runs. The panic terminates the server session task without causing memory corruption. This issue is fixed in version 0.62.4.

CVSS v3
4.3
EG Score
4.3MEDIUMmedium confidence
EG Risk
35
EG Risk 35/100CISA 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
Severity43% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.5%
EPSS %ILE
37th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (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

July 24, 2026

Last Modified

September 18, 2026

Advisory Details (3)

Auto-updated Aug 13, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github_release, github.
githubMentions a patch (unverified)🟡 PoC Available

Post-auth remote panic via pty-req with more than 130 terminal-mode records · Advisory · Eugeny/russh · GitHub

Affected: 0.61.0 but this

https://github.com/Eugeny/russh/security/advisories/GHSA-cqjc-rmpq-xprq
github_release Patch Available

v0.62.4

Patch available: Eugeny/russh v0.62.4

https://github.com/Eugeny/russh/releases/tag/v0.62.4
github_commit Patch Available

commit 891251237182 (Eugeny/russh)

Patch available: Eugeny/russh v0.62.4 (contains commit 891251237182)

https://github.com/Eugeny/russh/commit/8912512371820167a12a0a638bd666856ce458ad

Vendor Advisories for CVE-2026-73489(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)
crates.io(1)
PackageVulnerable rangeFix by version rangeDependents
russh—
  • every version up to 0.62.4: fixed in 0.62.4
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 35× 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
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  1. 2026-09-17 05:29 UTCEG score recompute
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  20. 2026-09-04 05:07 UTCEPSS rescore
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  22. 2026-09-01 23:16 UTCEG score recompute
  23. 2026-09-01 13:54 UTCEPSS rescore
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  26. 2026-08-30 23:07 UTCEG score recompute
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  30. 2026-08-30 00:17 UTCEG score recompute
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  40. 2026-08-22 16:47 UTCEG score recompute
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  44. 2026-08-19 20:17 UTCEG score recompute
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  46. 2026-08-18 19:22 UTCEG score recompute
  47. 2026-08-18 13:49 UTCEPSS rescore
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  49. 2026-08-17 20:31 UTCEG score recompute
  50. 2026-08-17 20:04 UTCEG score recompute
  51. 2026-08-17 13:47 UTCEPSS rescore
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  53. 2026-08-16 14:56 UTCEPSS rescore
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  56. 2026-08-15 20:12 UTCEG score recompute
  57. 2026-08-15 01:31 UTCEPSS rescore
  58. 2026-08-13 22:25 UTCEG score recompute
  59. 2026-08-12 21:21 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-73489?
CVE-2026-73489 is a medium vulnerability published on July 24, 2026. Russh is a Rust SSH client & server library. Prior to 0.62.4, an authenticated SSH client can cause a denial of service by sending a pty-req channel request with more than 130 terminal-mode records. The parser in russh/src/server/encrypted.rs stores terminal modes in a fixed 130-entry…
When was CVE-2026-73489 disclosed?
CVE-2026-73489 was first published on July 24, 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-2026-73489 actively exploited?
CVE-2026-73489 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (37th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-73489?
CVE-2026-73489 has a CVSS base score of 4.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-73489?
A fix for CVE-2026-73489 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-73489 are linked in the Vendor Advisories panel on this page.

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