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CVE-2026-56855 Details
Description
Previously, after a channel has been established, a malicious peer could send crafted messages that would deadlock the entire connection. Now, we handle all RFC 4254 channel messages; global requests are handled explicitly. Then, treat all other messages as a protocol error and tear the connection down instead of buffering and blocking.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Sep 3, 2026Exploitation: NoneAutomatable: YesTechnical Impact: Partial
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://go.dev/cl/826524 | [email protected] | Patch |
| https://go.dev/issue/81317 | [email protected] | Issue TrackingVendor Advisory |
| https://groups.google.com/g/golang-announce/c/1y3fb2np35U | [email protected] | Mailing ListVendor Advisory |
| https://pkg.go.dev/vuln/GO-2026-6355 | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-770 | Allocation of Resources Without Limits or Throttling | CISA-ADP |
Affected Products
| Product | Versions |
|---|---|
| golang crypto | < 0.56.0 |
CPE
Remediation
| |
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 4, 2026 | Initial Analysis | [email protected] |
| Sep 3, 2026 | CVE Modified | CISA-ADP |
| Sep 2, 2026 | New CVE Received | [email protected] |