Resource exhaustion in Golang Crypto
CVE-2026-78662
Previously, a channel registered in the mux's chanList is not usable until it is established. A malicious peer was able flood the channel's incomingRequests, deadlocking the entire connection. Now, we add an atomic established state, set when a channel becomes usable. Until such a time, handlePacket drops every packet other than the open confirmation/failure, without blocking and without tearing down the connection.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (35.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 35.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
Weakness classification (CWE)
References
- go.dev/cl/826504 (Patch)
- go.dev/issue/81316 (Issue Tracking, Vendor Advisory)
- groups.google.com/g/golang-announce/c/1y3fb2np35U (Mailing List, Vendor Advisory)
- pkg.go.dev/vuln/GO-2026-6354 (Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-78662?
- CVE-2026-78662 is a high-severity vulnerability in Golang Crypto, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-09-02.
- How severe is CVE-2026-78662?
- High severity. CVSS v3 base score is 7.5 out of 10.