Vulnerability in zotregistry.dev/zot/v2 (CVE-2026-61833)
Summary
Vulnerability in zotregistry.dev/zot/v2 (CVE-2026-61833). Data can be tampered with by attackers. Exploitable via pull. Mitigation: upgrade to 2.1.18 or later.
Original description
The description as published by the source.
Summary
A bearer token with only pull and push scopes can successfully delete manifests and blobs from a zot registry. The bearer authentication handler maps all non-GET/HEAD HTTP methods, including DELETE, to the "push" action, and the DistSpecAuthzHandler middleware is bypassed entirely for bearer-authenticated requests. This allows any client holding a push-only bearer token to delete arbitrary manifests and blobs within the token's repository scope, in violation of the Docker Distribution Token Authentication Specification.
Details
The vulnerability exists in two interacting components:
1. Action Mapping Collapse (pkg/api/authn.go:571–586)
The bearer authentication handler maps HTTP methods to token scope actions using a binary check:
action := "pull"
if m := request.Method; m != http.MethodGet && m != http.MethodHead {
action = "push"
}
This collapses DELETE, PUT, PATCH, and POST into a single "push" action. The "delete" action is never assigned.
2. Authorization Bypass for Bearer Auth (pkg/api/authz.go:270–275, 318–323)
When a request is authenticated via bearer token, the DistSpecAuthzHandler middleware, which performs fine-grained action inference (distinguishing create, read, update, and delete) is bypassed entirely:
if err != nil || (authnMwCtx != nil && authnMwCtx.AuthnType == BEARER) {
next.ServeHTTP(response, request)
ret…
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-61833 has been found in zotregistry.dev/zot/v2.
Attackers can target a specific entry point like pull over the network to misuse the product.
Data can be tampered with by attackers. CVSS score: 8.1/10.
What to do: upgrade zotregistry.dev/zot/v2 to 2.1.18 or later.
If unsure, ask your IT team or search "zotregistry.dev/zot/v2 CVE-2026-61833" on the vendor's site.
CVE-2026-61833 (zotregistry.dev/zot/v2) — CWE-285 / CVSS v3 8.1
Attack vector: remote (network-reachable) / no user interaction
Attack surface: pull / push / DistSpecAuthzHandler / create
Patched: 2.1.18 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-285) exists in zotregistry.dev/zot/v2. Attackers reach the vulnerable code path via pull.
Check the vendor advisory for the affected versions of zotregistry.dev/zot/v2. Attack surface: pull / push / DistSpecAuthzHandler / create.
Severity: High (CVSS 8.1/10). Data can be tampered with by attackers.
Update to 2.1.18.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'zotregistry.dev/zot/v2' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'zotregistry.dev/zot/v2' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
zotregistry.dev/zot/v2を grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade zotregistry.dev/zot/v2 to 2.1.18ステージング環境で 2.1.18 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
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