6.5

CVE-2026-48107: eugeny russh Improper Input Validation

CVSS: 6.5v3.1MediumDeferred
AliasesDEBIAN-CVE-2026-48107GHSA-g9g7-5cgw-6v28
Published 10-06-2026Last modified 11-06-2026
Open JSON

Vulnerability summary

CVE-2026-48107 is a medium (CVSS 6.5) Improper Input Validation vulnerability in eugeny russh. EPSS estimates a 0.42% chance of exploitation in the next 30 days, higher than 34.7% of scored vulnerabilities.

Overall risk
26/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.42%
0%100%
Low · +0.19 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 10-06-2026
    PublishedVulnerability first disclosed.
  2. 11-06-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.42%

Chance of exploitation in the next 30 days

Percentile

35%

Versus all other CVEs

30-day change

+0.19 pp

From 0.23% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.42%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Crates.Io1 product
  • russh≥ 0.37.0, < 0.61.0
Debian1 product
  • rust-russhAll versions (No fix recorded) | < 0.64.1-1
Eugeny1 product
  • russh≥ 0.37.0, < 0.61.0

3 vendors · 3 products

References

4 links