update to go1.26.4
This release include 3 security fixes following the security policy:
- mime: quadratic complexity in WordDecoder.DecodeHeader
Decoding a maliciously-crafted MIME header containing many invalid
encoded-words could consume excessive CPU.
The MIME decoder now better handles this case.
Thanks to p4p3r (https://hackerone.com/p4p3r_hak) for reporting this issue.
This is CVE-2026-42504 and Go issue https://go.dev/issue/79217.
- net/textproto: arbitrary input are included in errors without any escaping
When returning errors, functions in the net/textproto package would
include its input as part of the error, without any escaping. Note that
said input is often controlled by external parties when using this
package naturally. For example, a net/http client uses ReadMIMEHeader
when parsing the headers it receive from a server.
As a result, an attacker could inject arbitrary content into the error.
Practically, this can result in an attacker injecting misleading
content, terminal control bytes, etc. into a victim's output or logs.
This is CVE-2026-42507 and Go issue https://go.dev/issue/79346
- crypto/x509: split candidate hostname only once
(*x509.Certificate).VerifyHostname previously called matchHostnames in a loop
over all DNS Subject Alternative Name (SAN) entries. This caused
strings.Split(host, ".") to execute repeatedly on the same input hostname.
With a large DNS SAN list, verification costs scaled quadratically based on the
number of SAN entries multiplied by the hostname's label count. Because
x509.Verify validates hostnames before building the certificate chain, this
overhead occurred even for untrusted certificates.
Thanks to Jakub Ciolek (https://ciolek.dev) for reporting this issue.
This is CVE-2026-27145 and https://go.dev/issue/79694.
View the release notes for more information:
https://go.dev/doc/devel/release#go1.26.4
Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>
Paweł Gronowski authored on 2026/06/03 22:29:25Showing 15 changed files
- .github/workflows/.test-unit.yml
- .github/workflows/.test.yml
- .github/workflows/.vm.yml
- .github/workflows/.windows.yml
- .github/workflows/arm64.yml
- .github/workflows/buildkit.yml
- .github/workflows/codeql.yml
- .github/workflows/test.yml
- .golangci.yml
- Dockerfile
- Dockerfile.simple
- Dockerfile.windows
- api/Dockerfile
- hack/dockerfiles/generate-files.Dockerfile
- hack/dockerfiles/govulncheck.Dockerfile
| ... | ... |
@@ -2,7 +2,7 @@ version: "2" |
| 2 | 2 |
|
| 3 | 3 |
run: |
| 4 | 4 |
# prevent golangci-lint from deducting the go version to lint for through go.mod, |
| 5 |
- go: "1.26.3" |
|
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+ go: "1.26.4" |
|
| 6 | 6 |
# Only supported with go modules enabled (build flag -mod=vendor only valid when using modules) |
| 7 | 7 |
# modules-download-mode: vendor |
| 8 | 8 |
|
| ... | ... |
@@ -161,7 +161,7 @@ FROM ${WINDOWS_BASE_IMAGE}:${WINDOWS_BASE_IMAGE_TAG}
|
| 161 | 161 |
# Use PowerShell as the default shell |
| 162 | 162 |
SHELL ["powershell", "-Command", "$ErrorActionPreference = 'Stop'; $ProgressPreference = 'SilentlyContinue';"] |
| 163 | 163 |
|
| 164 |
-ARG GO_VERSION=1.26.3 |
|
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+ARG GO_VERSION=1.26.4 |
|
| 165 | 165 |
|
| 166 | 166 |
# GOTESTSUM_VERSION is the version of gotest.tools/gotestsum to install. |
| 167 | 167 |
ARG GOTESTSUM_VERSION=v1.13.0 |