CVE-2025-59531: Unauthenticated argocd-server panic via a malicious Bitbucket-Server webhook payload

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2025-10-01 · updated 2026-10-12
Weakness: CWE-703

Description

Argo CD is a declarative, GitOps continuous delivery tool for Kubernetes. Versions 1.2.0 through 1.8.7, 2.0.0-rc1 through 2.14.19, 3.0.0-rc1 through 3.2.0-rc1, 3.1.7 and 3.0.18 are vulnerable to malicious API requests which can crash the API server and cause denial of service to legitimate clients. Without a configured webhook.bitbucketserver.secret, Argo CD's /api/webhook endpoint crashes when receiving a malformed Bitbucket Server payload (non-array repository.links.clone field). A single unauthenticated request triggers CrashLoopBackOff, and targeting all replicas causes complete API outage. This issue is fixed in versions 2.14.20, 3.2.0-rc2, 3.1.8 and 3.0.19.

Affected products

argoproj argo-cd: from 1.2.0 through 1.8.7; from 2.0.0 before 2.14.20; from 3.0.0 before 3.0.19; from 3.1.0 before 3.1.8; 3.2.0-rc1 — fixed in 2.14.20, 3.0.19, 3.1.8

How to fix

Upgrade to a fixed version: argoproj argo-cd 2.14.20, 3.0.19, 3.1.8. Check the vendor advisory for mitigations.

References

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