Russh: Unchecked keyboard-interactive prompt count in client auth path
Priority LOW 28CWE-20Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- 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 0.37.0 to before version 0.61.0, in the russh client keyboard-interactive authentication path, a malicious SSH server could send a USERAUTH_INFO_REQUEST with an attacker-controlled prompt count, and the client would use that raw count directly in Vec::with_capacity(...) before validating that enough prompt data was actually present in the packet. This issue has been patched in version 0.61.0.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00232 14th 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
- None
- 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
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Eugeny | russh | 0.37.0 to before 0.61.0 | 0.61.0 | Patch available | CNA |
| — | russh (crates.io) | 0.37.0 to before 0.61.0 | 0.61.0 | Patch available | GHSA-g9g7-5cgw-6v28 |
- russh VendorEugeny Affected 0.37.0 to before 0.61.0 Fixed in 0.61.0 Patch available CNA
- russh (crates.io) Vendor— Affected 0.37.0 to before 0.61.0 Fixed in 0.61.0 Patch available GHSA-g9g7-5cgw-6v28
Remediation
- Fix · CNA russh (Eugeny) Fixed in 0.61.0
- Fix · GHSA-g9g7-5cgw-6v28 russh (crates.io) Fixed in 0.61.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-48107
- 2026-10-03 Alias added: GHSA-g9g7-5cgw-6v28
References
More Eugeny vulnerabilities
- 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
Sources
- CVE-2026-48107 · CVE Program
- CVE-2026-48107 · NVD
- FIRST EPSS
- GHSA-g9g7-5cgw-6v28 · GitHub Advisory Database · CC BY 4.0
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