Vulnerability · Published Oct 5, 2026 · Assigned by Docker
CVE-2026-93315BuildKit proxy CA cleanup can be disrupted by build steps
Medium 5.8
In plain English
A medium-severity security flaw in BuildKit from moby. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 1% of all known vulnerabilities).
Severity (CVSS 4.0)5.8Medium
Exploit odds (30 days)<0.1%top 99.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
When proxy networking with CA injection is enabled, a build can modify its CA bundle before cleanup. This may cause cleanup to block, operate outside the build rootfs, or fail without failing the build.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu:26.04:LTS | docker.io | no fix listed | UBUNTU-CVE-2026-93315 |
| Ubuntu:26.10 | docker.io | no fix listed | UBUNTU-CVE-2026-93315 |
| Ubuntu:26.04:LTS | docker.io-app | no fix listed | UBUNTU-CVE-2026-93315 |
| Ubuntu:26.10 | docker.io-app | no fix listed | UBUNTU-CVE-2026-93315 |
Affected products (as reported)
Weakness: CWE-367 · Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:L/SA:N