Go 1.27.4 and 1.26.11 security pre-announcement

Tier B · Patch this week – Put it in the sprint

Tier B because: Full takeover OR secrets exposed OR supply chain

Reach

Attack

Damage

Fix

Full takeover

What to do

The Brief

The Go team plans to issue Go 1.27.4 and Go 1.26.11, as announced in a security pre-announcement dated 2026-11-05.
The pre-announcement was sent to the golang-nuts mailing list and forwarded to oss-sec.
The available source text is truncated and does not describe the vulnerabilities or fixes.

Developers running Go 1.26 or 1.27 should expect security-related point releases and plan to upgrade once they are published.

Checklist · 2 of 10 yes · estimated from older data, not yet checked against the sources

Yes	Hits tech teams	Does it affect software, devices or services that developers, ops or IT teams build with, run or are responsible for?
No	Core infrastructure	Is the flaw in, or the compromise of, software that nearly every team runs?
No	Popular tool	Is the flaw in, or the compromise of, a widely used framework, tool, platform, OS or package?
No	Exploited in the wild	Do sources report real attacks using it?
No	Public exploit	Is a working exploit or detailed proof-of-concept public?
No	Remote, no login	Can an attacker use it over the network without credentials or user interaction?
Yes	Full takeover	Does it lead to code execution, root/admin rights or full account takeover?
No	Secrets exposed	Were credentials, tokens, keys, configs, source code or customer data stolen or exposed?
No	Supply chain	Was malicious code shipped through a channel developers trust?
No	No fix yet	Is there no patched version yet?

Nov 5
Security pre-announcement of Go 1.27.4 and Go 1.26.11 issued
Nov 5 · 10:29 PM
Open Source Security
Fwd: Go 1.27.4 and Go 1.26.11 pre-announcement

First seen 18h ago · 1 source · Full story page · How tiers are decided