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.
CVE-2026-102822
LOWPre-NVD 3.73.7—Trending — 3 sources updated this weekElevated
EchelonGraph scoreMEDIUM confidence
This low-severity CVE scores 3.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3% (23rd percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, secondary
3.7EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 3.7Exploit: Elevated riskExposed services: Not assessed
A fix is available — apply it.
- CVSS v3
- 3.7
- EG Score
- 3.7LOWmedium confidence
- EG Risk
- 33EG Risk 33/100CISA SSVC
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity37% × 45%Exploitation40% × 40%Automatability0% × 15%CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).Action: A fix is available. Apply it within your standard update timelines. - EPSS PROB
- 0.3%
- EPSS %ILE
- 23rd
- KEV
- Not listed
CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).
A fix is available. Apply it within your standard update timelines.
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table
Published
September 29, 2026
Last Modified
September 29, 2026
References (4)
- security-advisories@githubhttps://github.com/Eugeny/russh/commit/2885385abfee279092a41d80c6cb6ac367353159
- security-advisories@githubhttps://github.com/Eugeny/russh/releases/tag/v0.63.1
- security-advisories@githubhttps://github.com/Eugeny/russh/security/advisories/GHSA-p8qx-h547-fjw9
- 134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/Eugeny/russh/security/advisories/GHSA-p8qx-h547-fjw9
Vendor Advisories for CVE-2026-102822(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Affected Packages
(1 across 1 ecosystem)
crates.io(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| russh | — | 0.63.1 | — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 9× in last 7d / 9× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-10-03 14:25 UTCEPSS rescore
- 2026-10-02 18:53 UTCEG score recompute
- 2026-10-01 19:49 UTCEPSS rescore
- 2026-09-30 15:02 UTCEPSS rescore
- 2026-09-29 20:26 UTCEG score recompute
- 2026-09-29 20:01 UTCEG score recompute
- 2026-09-29 19:20 UTCEG score recompute
- 2026-09-29 18:28 UTCEG score recompute
- 2026-09-29 18:28 UTCMITRE cvelistV5first tracked
Related CVEs(same product + same CWE)
Same product
10 showncrates.io:russh
Frequently asked(5)
What is CVE-2026-102822?
CVE-2026-102822 is a low vulnerability published on September 29, 2026. 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…
When was CVE-2026-102822 disclosed?
CVE-2026-102822 was first published on September 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-102822 actively exploited?
CVE-2026-102822 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (23rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-102822?
CVE-2026-102822 has a CVSS base score of 3.7 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-102822?
A fix for CVE-2026-102822 is available — its CVE record says: "This issue is fixed in version 0.63.1." The vendor advisories EchelonGraph has for CVE-2026-102822 are linked in the Vendor Advisories panel on this page.
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-102822
Is Your Infrastructure Affected by CVE-2026-102822?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.