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TI-2026-51601 Aliases CVE-2026-73489GHSA-cqjc-rmpq-xprq

Russh: Post-auth remote panic via pty-req with more than 130 terminal-mode records

Priority MEDIUM 53CWE-129Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · None · Low
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00451 39th percentileScored 2026-11-07
Fix Fixed russh (Eugeny): 0.62.4russh (crates.io): 0.62.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Eugenyrusshbefore 0.62.40.62.4Patch availableCNA
—russh (crates.io)before 0.62.40.62.4Patch availableGHSA-cqjc-rmpq-xprq
  • russh VendorEugeny Affected before 0.62.4 Fixed in 0.62.4 Patch available CNA
  • russh (crates.io) Vendor— Affected before 0.62.4 Fixed in 0.62.4 Patch available GHSA-cqjc-rmpq-xprq

Remediation

  • Fix · CNA russh (Eugeny) Fixed in 0.62.4
  • Fix · GHSA-cqjc-rmpq-xprq russh (crates.io) Fixed in 0.62.4 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-73489
  2. 2026-10-03 Alias added: GHSA-cqjc-rmpq-xprq

References

Other 4

  • TI-2026-65512 russh: Client-side channel-scoped Handler callbacks fire for channel IDs the client never opened CVSS 3.1HIGH 7.5
  • TI-2026-35550 Russh: SSH message fields were decoded through allocation-first parsers before field-specific bounds CVSS 3.1HIGH 7.5
  • TI-2026-34331 Russh: Post-decompression SSH packet size was not bounded, allowing remote oversized compressed packets CVSS 3.1HIGH 7.5
  • TI-2026-34308 Resource allocation without limits in Eugeny russh CVSS 3.1HIGH 7.5
  • TI-2025-16084 Tabby has a TCC Bypass via Misconfigured Node Fuses CVSS 4.0HIGH 8.6
  • TI-2024-36991 Tabby has a TCC Bypass via Unnecessary Permissive Entitlements in Tabby CVSS 4.0HIGH 8.6
See all 25 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences