CVE-2026-25921Public exploitNetwork attack vector

LFS object overwrite via unverified content hashes

Published Mar 5, 2026 · Updated Mar 5, 2026

Data integrity violation in Gogs before 0.14.2 allows remote attackers to overwrite cross-repository LFS objects via crafted uploads. LocalStorage.Upload writes content to a global path keyed only by the claimed object ID, without including the repository or verifying the SHA-256 digest. A malicious upload can replace LFS content referenced by other repositories, causing downstream users to retrieve attacker-controlled files.

CVSS severity9.3
Critical
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Data integrity violation in Gogs before 0.14.2 allows remote attackers to overwrite cross-repository LFS objects via crafted uploads. LocalStorage.Upload writes content to a global path keyed only by the claimed object ID, without including the repository or verifying the SHA-256 digest. A malicious upload can replace LFS content referenced by other repositories, causing downstream users to retrieve attacker-controlled files.

The record

CVE
CVE-2026-25921
Published
Mar 5, 2026
Updated
Mar 5, 2026
Vendor
Gogs
Product
Gogs
Classifications
CWE-345, T1565.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.14.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Gogs · Gogsversion=< 0.14.2

Published CVSS scores

9.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-345Insufficient Verification of Data Authenticity
T1565.001Stored Data Manipulation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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