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TI-2025-34558 Aliases CVE-2025-54804GHSA-h5rc-j5f5-3gcm

Russh is missing an overflow check during channel windows adjust

Priority MEDIUM 62CWE-190Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 1 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-190 and the CVSS impact.

Summary

Russh is a Rust SSH client & server library. In versions 0.54.0 and below, the channel window adjust message of the SSH protocol is used to track the free space in the receive buffer of the other side of a channel. The current implementation takes the value from the message and adds it to an internal state value. This can result in a integer overflow. If the Rust code is compiled with overflow checks, it will panic. A malicious client can crash a server. This is fixed in version 0.54.1.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0045 39th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial russh (Eugeny): 0.54.1russh (crates.io): 0.54.1Red Hat: 1 without a fix

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 0.54.10.54.1Patch availableCNA
—russh (crates.io)before 0.54.10.54.1Patch availableGHSA-h5rc-j5f5-3gcm
  • russh VendorEugeny Affected before 0.54.1 Fixed in 0.54.1 Patch available CNA
  • russh (crates.io) Vendor— Affected before 0.54.1 Fixed in 0.54.1 Patch available GHSA-h5rc-j5f5-3gcm

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:russh_project:russh:*:*:*:*:*:rust:*:*before 0.54.1VulnerableRussh Project
cpe:2.3:a:warpgate_project:warpgate:*:*:*:*:*:*:*:*before 0.16.0Vulnerablewarp-tech
  • cpe:2.3:a:russh_project:russh:*:*:*:*:*:rust:*:* Versions before 0.54.1 Vulnerable ·Russh Project
  • cpe:2.3:a:warpgate_project:warpgate:*:*:*:*:*:*:*:* Versions before 0.16.0 Vulnerable ·warp-tech

Remediation

  • Fix · CNA russh (Eugeny) Fixed in 0.54.1
  • Fix · GHSA-h5rc-j5f5-3gcm russh (crates.io) Fixed in 0.54.1 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat OpenShift Dev SpacesAffectedNo fix planned: Will not fix

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-54804
  2. 2026-10-03 Alias added: GHSA-h5rc-j5f5-3gcm

References

Exploit 1

Patch 1

Advisory 1

Other 1

  • 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