Insufficient Verification of Data Authenticity Affecting gogs.io/gogs/conf package, versions <0.14.2-rc.1
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-GOGSIOGOGSCONF-15434732
- published6 Mar 2026
- disclosed5 Mar 2026
- creditChenYuan
Introduced: 5 Mar 2026
CVE-2026-25921 Â (opens in a new tab)How to fix?
Upgrade gogs.io/gogs/conf to version 0.14.2-rc.1 or higher.
Overview
Affected versions of this package are vulnerable to Insufficient Verification of Data Authenticity in the handling of LFS object uploads. An attacker can overwrite existing LFS objects across different repositories by uploading objects with the same identifier, potentially leading to unauthorized modification of repository content and enabling supply-chain attacks.
PoC
Overwritable LFS object across different repos leads to supply-chain attack, all LFS objects are vulnerable to be maliciously overwritten by malicious attackers. lfs: verify content hash and prevent object overwrite
Prevent cross-repository LFS object overwrite by using O_CREATE|O_EXCL to atomically refuse writing to an existing file path. If the file already exists (same OID uploaded by another repo), the existing size is returned so the caller can still create the DB record linking the new repo to that OID. Compute SHA-256 of uploaded content during write and reject the upload if the hash does not match the claimed OID, preventing an attacker from writing arbitrary content to a known OID path.