Description
When Conn.Handshake fails during ALPN negotiation the error contains attacker controlled information (the ALPN protocols sent by the client) which is not escaped.
References (5)
Core 5
Core References
Patch
https://go.dev/cl/707776
Issue Tracking
https://go.dev/issue/75652
Mailing List, Release Notes
https://groups.google.com/g/golang-announce/c/4Emdl2iQ_bI
Vendor Advisory
https://pkg.go.dev/vuln/GO-2025-4008
Mailing List, Release Notes, Third Party Advisory
http://www.openwall.com/lists/oss-security/2025/10/08/1
Scores
CVSS v3
5.3
EPSS
0.0040
EPSS Percentile
32.0%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-532
Status
published
Products (1)
golang/go
< 1.24.8
Published
Oct 29, 2025
Tracked Since
Feb 18, 2026