Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-102823— russh: Client-side channel-scoped Handler callbacks fire for channel IDs the client never opened

Quick assessment

Affected
Eugeny russh
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Russh is a Rust SSH client and server library. Prior to 0.63.1, client_read_authenticated in russh/src/client/encrypted.rs forwards CHANNEL_DATA, CHANNEL_EXTENDED_DATA, CHANNEL_EOF, CHANNEL_CLOSE, CHANNEL_OPEN_FAILURE, CHANNEL_SUCCESS, CHANNEL_FAILURE, and CHA

CVSS 7.5 · High
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-102823

Vulnerability Information

Shenlong is analyzing...

Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
russh: Client-side channel-scoped Handler callbacks fire for channel IDs the client never opened
Source: CVE Program / CVE List V5
Vulnerability Description
Russh is a Rust SSH client and server library. Prior to 0.63.1, client_read_authenticated in russh/src/client/encrypted.rs forwards CHANNEL_DATA, CHANNEL_EXTENDED_DATA, CHANNEL_EOF, CHANNEL_CLOSE, CHANNEL_OPEN_FAILURE, CHANNEL_SUCCESS, CHANNEL_FAILURE, and CHANNEL_REQUEST subtypes exit-status, exit-signal, and xon-xoff to public client::Handler callbacks without confirming that the ChannelId belongs to a channel the client opened and established. A malicious SSH server can send lifecycle events for predicted, unopened, unconfirmed, or released channel identifiers, causing application panics or corrupting command completion and exit-code tracking. This issue is fixed in version 0.63.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Eugeny russh < 0.63.1 -

II. Public POCs for CVE-2026-102823

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-102823

请登录查看更多情报信息。

Other References for CVE-2026-102823 (3)

Same Patch Batch · Eugeny · 2026-09-29 · 6 CVEs total

CVE-2026-102821 6.5 MEDIUM Russh: Unbounded memory exhaustion via CHANNEL_OPEN flood during a client-stalled rekey
CVE-2026-102820 6.2 MEDIUM pageant: Out-of-bounds read / oversized allocation in `pageant` MemoryMap::read via a mali
CVE-2026-102824 4.3 MEDIUM Russh: Missing X25519 zero-point validation in hybrid ML-KEM key exchange
CVE-2026-102822 3.7 LOW russh: negotiating a MAC-requiring block cipher (CTR/CBC) with mac=none causes a slice-ind
CVE-2026-102825 3.7 LOW Russh: Configured server auth-attempt cap is not enforced in the USERAUTH_REQUEST runtime

IV. Related Vulnerabilities

Same product: russh
Same vendor: Eugeny
Same weakness: CWE-20

V. Comments for CVE-2026-102823

No comments yet

Leave a comment