Quick answers
- Is CVE-2026-64773 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-64773 being exploited in the wild.
- How severe is CVE-2026-64773?
- High severity, with a CVSS score of 7.5, published 20 August 2026.
- Which products and versions are affected?
- Apple Container 0.3.0 to 1.1.0.
- Is there a fix for CVE-2026-64773?
- A patch was published on 2026-08-20: Version 1.2.0 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-64773 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-64773?
- Check whether you run Apple Container at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability exists in the ConnectHandler component of the TCP port forwarder in Apple's container, introduced when TCP/UDP port forwarding was first added in version 0.3.0. The forwarder buffers client data sent before the backend container connection is accepted, with no limits on buffer size or duration. An unauthenticated network attacker who can reach a container's published TCP port can repeatedly send data and keep connections open, forcing unbounded memory consumption on the host's container-runtime-linux process. The UDP forwarder uses a separate bounded queue and is not affected. The vulnerability is patched in version 1.2.0; affected versions are 0.3.0 through 1.1.0. Mitigation prior to patching includes binding published ports to localhost (127.0.0.1) or ensuring the backend application accepts connections promptly.
Affected products
- Apple container 0.3.0 to 1.1.0
Timeline
- 2026-08-12: disclosed
- 2026-08-20: advisory
- 2026-08-20: patched: Version 1.2.0 released