CVE-2026-78660
Published:October 08, 2026
Updated:October 09, 2026
Historically, we have been rather lax about malformed framing-related headers in our HTTP/2 implementation, as they cannot interfere with HTTP/2 framing. However, this makes it possible for our HTTP/2 implementation to forward responses containing such headers to an HTTP/1 client when acting as a reverse proxy. If the HTTP/1 client also does not behave strictly enough, this can result in response smuggling.
Affected Packages
https://github.com/golang/go.git (GITHUB):
Affected version(s) >=go1.27.0 <go1.27.2Fix Suggestion:
Update to version go1.27.2https://github.com/golang/net.git (GITHUB):
Affected version(s) >=v0.1.0 <v0.60.0Fix Suggestion:
Update to version v0.60.0https://github.com/golang/go.git (GITHUB):
Affected version(s) >=go1.6 <go1.26.9Fix Suggestion:
Update to version go1.26.9github.com/golang/go (GO):
Affected version(s) >=go1.6 <go1.26.9Fix Suggestion:
Update to version go1.26.9github.com/golang/go (GO):
Affected version(s) >=go1.27.0 <go1.27.2Fix Suggestion:
Update to version go1.27.2golang.org/x/net (GO):
Affected version(s) >=v0.0.0-20150924072440-17e723d0226c <v0.60.0Fix Suggestion:
Update to version v0.60.0Related Resources (5)
Do you need more information?
Contact UsCVSS v4
Base Score:
6.3
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
4.8
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE