CVE-2026-93317 Container blob cache can accept unverified content
An attacker can poison the container blob cache with unverified content, compromising build integrity for subsequent users.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-93317?
CVE-2026-93317 is a medium-severity vulnerability in moby BuildKit, published on 5 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
An unauthenticated attacker controlling a registry or OCI-layout blob source could provide blob contents that did not match the claimed digest. The resulting snapshot could be cached under that digest and reused by a later victim build, compromising build-input integrity.
Weakness: CWE-354
Which versions are affected by CVE-2026-93317?
How do I fix CVE-2026-93317?
No fix has been published for CVE-2026-93317 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-93317 being exploited?
There is no known exploitation of CVE-2026-93317 in the wild and no public exploit code.
Sources
Also known as GHSA-p3rc-w3hc-pqvv, UBUNTU-CVE-2026-93317.