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Moderate severityNVD Advisory· Published Nov 7, 2025· Updated Nov 7, 2025

containerd CRI server: Host memory exhaustion through Attach goroutine leak

CVE-2025-64329

Description

containerd is an open-source container runtime. Versions 1.7.28 and below, 2.0.0-beta.0 through 2.0.6, 2.1.0-beta.0 through 2.1.4, and 2.2.0-beta.0 through 2.2.0-rc.1 contain a bug in the CRI Attach implementation where a user can exhaust memory on the host due to goroutine leaks. This issue is fixed in versions 1.7.29, 2.0.7, 2.1.5 and 2.2.0. To workaround this vulnerability, users can set up an admission controller to control accesses to pods/attach resources.

Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
github.com/containerd/containerdGo
< 1.7.291.7.29
github.com/containerd/containerd/v2Go
< 2.0.72.0.7
github.com/containerd/containerd/v2Go
>= 2.1.0-beta.0, < 2.1.52.1.5
github.com/containerd/containerd/v2Go
>= 2.2.0-beta.0, < 2.2.02.2.0

Affected products

1

Patches

1
083b53cd6f19

Merge commit from fork

https://github.com/containerd/containerdDerek McGowanNov 5, 2025via ghsa
commit
2 files changed · +12 −4
  • internal/cri/io/container_io.go+11 −3 modified
    @@ -17,6 +17,7 @@
 package io
 
 import (
+	"context"
 	"errors"
 	"fmt"
 	"io"
@@ -160,7 +161,7 @@ func (c *ContainerIO) Pipe() {
 
 // Attach attaches container stdio.
 // TODO(random-liu): Use pools.Copy in docker to reduce memory usage?
-func (c *ContainerIO) Attach(opts AttachOptions) {
+func (c *ContainerIO) Attach(ctx context.Context, opts AttachOptions) {
 	var wg sync.WaitGroup
 	key := util.GenerateID()
 	stdinKey := streamKey(c.id, "attach-"+key, Stdin)
@@ -201,8 +202,15 @@ func (c *ContainerIO) Attach(opts AttachOptions) {
 	}
 
 	attachStream := func(key string, close <-chan struct{}) {
-		<-close
-		log.L.Infof("Attach stream %q closed", key)
+		select {
+		case <-close:
+			log.L.Infof("Attach stream %q closed", key)
+		case <-ctx.Done():
+			log.L.Infof("Attach client of %q cancelled", key)
+			// Avoid writeGroup heap up
+			c.stdoutGroup.Remove(key)
+			c.stderrGroup.Remove(key)
+		}
 		// Make sure stdin gets closed.
 		if stdinStreamRC != nil {
 			stdinStreamRC.Close()
  • internal/cri/server/container_attach.go+1 −1 modified
    @@ -82,6 +82,6 @@ func (c *criService) attachContainer(ctx context.Context, id string, stdin io.Re
 		},
 	}
 	// TODO(random-liu): Figure out whether we need to support historical output.
-	cntr.IO.Attach(opts)
+	cntr.IO.Attach(ctx, opts)
 	return nil
 }

Vulnerability mechanics

Generated by null/stub on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.

References

4

News mentions

0

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