3.7

CVE-2026-102822: eugeny russh Improper Validation of Array Index

CVSS: 3.7v3.1LowDeferred
AliasesGHSA-p8qx-h547-fjw9DEBIAN-CVE-2026-102822UBUNTU-CVE-2026-102822
Published 29-09-2026Last modified 29-09-2026
Open JSON

Vulnerability summary

CVE-2026-102822 is a low (CVSS 3.7) Improper Validation of Array Index vulnerability in eugeny russh. EPSS estimates a 0.33% chance of exploitation in the next 30 days, higher than 24.2% of scored vulnerabilities.

Overall risk
15/100
0100
Low · default modelHow is this calculated?
CVSS score
3.7/10
010
Low · v3.1 (CVE.org)
EPSS score
0.33%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 29-09-2026
    PublishedVulnerability first disclosed.
  2. 29-09-2026
    Last modifiedVulnerability information updated.

Description

Russh is a Rust SSH client and server library. Prior to 0.63.1, a connection configured to permit mac=none can negotiate it with a MAC-requiring CTR or CBC block cipher because the selection logic validates needs_mac() only when MAC selection fails. A remote peer can then send a packet with a decrypted length of zero, causing russh/src/cipher/mod.rs to shrink the previously read block before indexing buffer.buffer[16..], which panics and terminates the connection task. This issue is fixed in version 0.63.1.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.33%

Chance of exploitation in the next 30 days

Percentile

24%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

30-09-202620-10-2026
EPSS score
0.33%

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< 0.63.1
Debian1 product
  • rust-russh< 0.64.1-1
Eugeny1 product
Ubuntu1 product
  • rust-russhAll versions (No fix recorded)

4 vendors · 4 products

References

8 links