Read the docs
TI-2026-35550 Aliases CVE-2026-48110GHSA-4r3c-5hpg-58qr

Russh: SSH message fields were decoded through allocation-first parsers before field-specific bounds

Priority HIGH 72CWE-20Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · None · High
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. From version 0.34.0 to before version 0.61.0, several russh client and server message handlers decoded attacker-controlled SSH strings, name-lists, and byte fields into owned allocations before applying field-specific bounds. A remote SSH peer could send oversized, high-fanout, or malformed length-prefixed fields and make the library allocate, attempt to allocate, or split data before rejecting input that should have been rejected earlier. This issue has been patched in version 0.61.0.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00367 30th percentileScored 2026-11-07
Fix Fixed russh (Eugeny): 0.61.0russh (crates.io): 0.61.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
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
Eugenyrussh0.34.0 to before 0.61.00.61.0Patch availableCNA
—russh (crates.io)0.34.0 to before 0.61.00.61.0Patch availableGHSA-4r3c-5hpg-58qr
  • russh VendorEugeny Affected 0.34.0 to before 0.61.0 Fixed in 0.61.0 Patch available CNA
  • russh (crates.io) Vendor— Affected 0.34.0 to before 0.61.0 Fixed in 0.61.0 Patch available GHSA-4r3c-5hpg-58qr

Remediation

  • Fix · CNA russh (Eugeny) Fixed in 0.61.0
  • Fix · GHSA-4r3c-5hpg-58qr russh (crates.io) Fixed in 0.61.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-48110
  2. 2026-10-03 Alias added: GHSA-4r3c-5hpg-58qr

References

Advisory 1

Other 3

  • TI-2026-65512 russh: Client-side channel-scoped Handler callbacks fire for channel IDs the client never opened CVSS 3.1HIGH 7.5
  • TI-2026-34331 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
  • TI-2026-82122 Missing confirmation check in russh SSH agent for constrained keys CVSS 4.0HIGH 8.3
See all 25 →

Sources

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