Buffer overflow in Golang Crypto
CVE-2026-39830
A malicious SSH peer could send unsolicited global request responses to fill an internal buffer, blocking the connection's read loop. The blocked goroutine could not be released by calling Close(), resulting in a resource leak per connecti…
Vulnerability class: Buffer Overflow
EPSS: 0.001 (17.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.
Affected products
Weakness classification (CWE)
References
- security@golang.org (Issue Tracking)
- security@golang.org (Mailing List)
- security@golang.org (Issue Tracking)
- security@golang.org (Issue Tracking)
- security@golang.org (Vendor Advisory)
Frequently asked questions
- What is CVE-2026-39830?
- CVE-2026-39830 is a critical-severity vulnerability in Golang Crypto, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.1/10. Published 2026-05-22.
- How severe is CVE-2026-39830?
- Critical severity. CVSS v3 base score is 9.1 out of 10.