Vulnerability · Published Nov 3, 2026 · Assigned by Docker
CVE-2026-121522Possible panic from Git source resolver
Medium 6.7
In plain English
A medium-severity null pointer dereference 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 2% of all known vulnerabilities).
Severity (CVSS 4.0)6.7Medium
Exploit odds (30 days)0.1%top 98.3% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
In BuildKit versions v0.26.0 through v0.34.1, a specific build definition that resolves metadata for the same Git source reference twice can cause the BuildKit daemon to panic and crash, interrupting builds handled by that daemon. The issue is fixed in v0.34.2.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu:26.04:LTS | docker.io | no fix listed | UBUNTU-CVE-2026-121522 |
| Ubuntu:26.10 | docker.io | no fix listed | UBUNTU-CVE-2026-121522 |
| Ubuntu:26.04:LTS | docker.io-app | no fix listed | UBUNTU-CVE-2026-121522 |
| Ubuntu:26.10 | docker.io-app | no fix listed | UBUNTU-CVE-2026-121522 |
Affected products (as reported)
Weakness: CWE-476 · Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N