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CVE-2026-42600

MinIO: Path Traversal via msgpack Body in `ReadMultiple` Storage-REST Endpoint

6.9 MediumFix available

MinIO is a high-performance object storage system. From RELEASE.2022-07-24T01-54-52Z to before RELEASE.2026-04-14T21-32-45Z, A path traversal vulnerability in MinIO's ReadMultiple internode storage-REST endpoint allows a caller holding the cluster root JWT to read files from outside the configured drive roots, bounded only by the MinIO process UID. The attacker sends POST minio/storage/{drivePath}/v63/rmpl with a msgpack-encoded body carrying ../ sequences in the Bucket field. The server opens the resulting path via os.OpenFile with O_RDONLY|O_NOATIME and returns its contents in the msgpack response stream. This vulnerability is fixed in RELEASE.2026-04-14T21-32-45Z.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
High
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
None
Availability
None

Exploit likelihood

8.70%Up 8.6 points since May 12, 2026
90%50%10%1%

What each source reports

CVE List Score used 6.9

MinIO: Path Traversal via msgpack Body in `ReadMultiple` Storage-REST Endpoint

MinIO is a high-performance object storage system. From RELEASE.2022-07-24T01-54-52Z to before RELEASE.2026-04-14T21-32-45Z, A path traversal vulnerability in MinIO's ReadMultiple internode storage-REST endpoint allows a caller holding the cluster root JWT to read files from outside the configured drive roots, bounded only by the MinIO process UID. The attacker sends POST minio/storage/{drivePath}/v63/rmpl with a msgpack-encoded body carrying ../ sequences in the Bucket field. The server opens the resulting path via os.OpenFile with O_RDONLY|O_NOATIME and returns its contents in the msgpack response stream. This vulnerability is fixed in RELEASE.2026-04-14T21-32-45Z.

Record
CVE-2026-42600
CVSS 4.0
6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-22
Updated
2026-11-02
EUVDEUVD-2026-29296 6.9

MinIO is a high-performance object storage system. From RELEASE.2022-07-24T01-54-52Z to before RELEASE.2026-04-14T21-32-45Z, A path traversal vulnerability in MinIO's ReadMultiple internode storage-REST endpoint allows a caller holding the cluster root JWT to read files from outside the configured drive roots, bounded only by the MinIO process UID. The attacker sends POST minio/storage/{drivePath}/v63/rmpl with a msgpack-encoded body carrying ../ sequences in the Bucket field. The server opens the resulting path via os.OpenFile with O_RDONLY|O_NOATIME and returns its contents in the msgpack response stream. This vulnerability is fixed in RELEASE.2026-04-14T21-32-45Z.

Record
EUVD-2026-29296
CVSS 4.0
6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-xh8f-g2qw-gcm7 6.9

MinIO vulnerable to Path Traversal via msgpack Body in `ReadMultiple` Storage-REST Endpoint

Impact

What kind of vulnerability is it? Who is impacted?

A path traversal vulnerability in MinIO's ReadMultiple internode storage-REST endpoint allows a caller holding the cluster root JWT to read files from outside the configured drive roots, bounded only by the MinIO process UID.

Distributed-erasure (multi-node) MinIO deployments are impacted. Single-node standalone deployments do not register the route and are not affected. The attack requires an HS512 JWT signed with MINIO_ROOT_PASSWORD and carrying accessKey = MINIO_ROOT_USER — the same secret every peer in the cluster holds to authenticate internode traffic, so a compromised peer or any actor in possession of the root credential can mint one.

The ReadMultiple handler (cmd/storage-rest-server.go) decodes a msgpack ReadMultipleReq body containing Bucket, Prefix, and Files fields and forwards them to xlStorage.ReadMultiple (cmd/xl-storage.go) without validation:

volumeDir := pathJoin(s.drivePath, req.Bucket)          // traversal resolves here
for _, f := range req.Files {
    fullPath := pathJoin(volumeDir, req.Prefix, f)
    data, mt, err = s.readAllDataWithDMTime(ctx, req.Bucket, volumeDir, fullPath)
}

pathJoin calls path.Clean, which resolves .. components and produces an absolute path anywhere on the filesystem — it is not a root jail. The global setRequestValidityMiddleware rejects .. in r.URL.Path and r.Form but does not inspect request bodies, so msgpack-encoded traversal bypasses it. Sibling storage methods (StatInfoFile, ReadFileHandler, ReadVersion) validate their volume argument through s.getVolDir(volume), which rejects ..; ReadMultiple skips this call.

The attacker sends POST /minio/storage/{drivePath}/v63/rmpl with a msgpack-encoded body carrying ../ sequences in the Bucket field. The server opens the resulting path via os.OpenFile with O_RDONLY|O_NOATIME and returns its contents in the msgpack response stream.

Impact by deployment:

  • Bare-metal with User=minio in the systemd unit — the O_NOATIME ownership check bounds the read to files owned by the MinIO UID. Reachable secrets include TLS private keys, KMS/KES key material, systemd credentials, and data belonging to other tenants sharing the same UID on the host. Secrets leaked this way persist across cluster credential rotation.

  • Containerized running as UID 0 (the historical default for the official Docker image, docker-compose examples, and Helm charts without securityContext.runAsNonRoot) — the primitive escalates to arbitrary host-filesystem disclosure: /etc/shadow, /root/**, Kubernetes service-account tokens, cloud-init metadata caches.

Affected components: cmd/storage-rest-server.go (ReadMultiple handler), cmd/xl-storage.go (xlStorage.ReadMultiple).

CWE: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory — 'Path Traversal')

CVSS v4.0 Score: 6.9 (Medium)

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Affected Versions

All MinIO releases from RELEASE.2022-07-24T01-54-52Z through the final release of the minio/minio open-source project, RELEASE.2025-09-07T16-13-09Z.

The vulnerability was introduced in commit f939d1c18 ("Independent Multipart Uploads", PR #15346), which added the ReadMultiple storage-REST endpoint as part of the multipart upload redesign. The first affected release is RELEASE.2022-07-24T01-54-52Z.

Patches

Fixed in: MinIO AIStor RELEASE.2026-04-14T21-32-45Z (recommended upgrade target). The fix — which removed the ReadMultiple handler, the corresponding storage-driver method, the msgpack datatypes, the REST-client wrapper, and the route registration — first shipped in MinIO AIStor RELEASE.2024-10-23T19-38-07Z. Every…

Record
GHSA-xh8f-g2qw-gcm7
CVSS 4.0
6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CVSS 3.1
4.9 MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-22
Updated
2026-11-02
NVD 6.9

MinIO is a high-performance object storage system. From RELEASE.2022-07-24T01-54-52Z to before RELEASE.2026-04-14T21-32-45Z, A path traversal vulnerability in MinIO's ReadMultiple internode storage-REST endpoint allows a caller holding the cluster root JWT to read files from outside the configured drive roots, bounded only by the MinIO process UID. The attacker sends POST minio/storage/{drivePath}/v63/rmpl with a msgpack-encoded body carrying ../ sequences in the Bucket field. The server opens the resulting path via os.OpenFile with O_RDONLY|O_NOATIME and returns its contents in the msgpack response stream. This vulnerability is fixed in RELEASE.2026-04-14T21-32-45Z.

Record
CVE-2026-42600
CVSS 4.0
6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/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
CVSS 3.1
4.9 MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-22
Updated
2026-11-02
OSVGHSA-xh8f-g2qw-gcm7 6.9

MinIO vulnerable to Path Traversal via msgpack Body in `ReadMultiple` Storage-REST Endpoint

Impact

What kind of vulnerability is it? Who is impacted?

A path traversal vulnerability in MinIO's ReadMultiple internode storage-REST endpoint allows a caller holding the cluster root JWT to read files from outside the configured drive roots, bounded only by the MinIO process UID.

Distributed-erasure (multi-node) MinIO deployments are impacted. Single-node standalone deployments do not register the route and are not affected. The attack requires an HS512 JWT signed with MINIO_ROOT_PASSWORD and carrying accessKey = MINIO_ROOT_USER — the same secret every peer in the cluster holds to authenticate internode traffic, so a compromised peer or any actor in possession of the root credential can mint one.

The ReadMultiple handler (cmd/storage-rest-server.go) decodes a msgpack ReadMultipleReq body containing Bucket, Prefix, and Files fields and forwards them to xlStorage.ReadMultiple (cmd/xl-storage.go) without validation:

volumeDir := pathJoin(s.drivePath, req.Bucket)          // traversal resolves here
for _, f := range req.Files {
    fullPath := pathJoin(volumeDir, req.Prefix, f)
    data, mt, err = s.readAllDataWithDMTime(ctx, req.Bucket, volumeDir, fullPath)
}

pathJoin calls path.Clean, which resolves .. components and produces an absolute path anywhere on the filesystem — it is not a root jail. The global setRequestValidityMiddleware rejects .. in r.URL.Path and r.Form but does not inspect request bodies, so msgpack-encoded traversal bypasses it. Sibling storage methods (StatInfoFile, ReadFileHandler, ReadVersion) validate their volume argument through s.getVolDir(volume), which rejects ..; ReadMultiple skips this call.

The attacker sends POST /minio/storage/{drivePath}/v63/rmpl with a msgpack-encoded body carrying ../ sequences in the Bucket field. The server opens the resulting path via os.OpenFile with O_RDONLY|O_NOATIME and returns its contents in the msgpack response stream.

Impact by deployment:

  • Bare-metal with User=minio in the systemd unit — the O_NOATIME ownership check bounds the read to files owned by the MinIO UID. Reachable secrets include TLS private keys, KMS/KES key material, systemd credentials, and data belonging to other tenants sharing the same UID on the host. Secrets leaked this way persist across cluster credential rotation.

  • Containerized running as UID 0 (the historical default for the official Docker image, docker-compose examples, and Helm charts without securityContext.runAsNonRoot) — the primitive escalates to arbitrary host-filesystem disclosure: /etc/shadow, /root/**, Kubernetes service-account tokens, cloud-init metadata caches.

Affected components: cmd/storage-rest-server.go (ReadMultiple handler), cmd/xl-storage.go (xlStorage.ReadMultiple).

CWE: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory — 'Path Traversal')

CVSS v4.0 Score: 6.9 (Medium)

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Affected Versions

All MinIO releases from RELEASE.2022-07-24T01-54-52Z through the final release of the minio/minio open-source project, RELEASE.2025-09-07T16-13-09Z.

The vulnerability was introduced in commit f939d1c18 ("Independent Multipart Uploads", PR #15346), which added the ReadMultiple storage-REST endpoint as part of the multipart upload redesign. The first affected release is RELEASE.2022-07-24T01-54-52Z.

Patches

Fixed in: MinIO AIStor RELEASE.2026-04-14T21-32-45Z (recommended upgrade target). The fix — which removed the ReadMultiple handler, the corresponding storage-driver method, the msgpack datatypes, the REST-client wrapper, and the route registration — first shipped in MinIO AIStor RELEASE.2024-10-23T19-38-07Z. Every…

Record
GHSA-xh8f-g2qw-gcm7
CVSS 4.0
6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CVSS 3.1
4.9 MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-22
Updated
2026-11-02
OSVGO-2026-5757 No score

MinIO vulnerable to Path Traversal via msgpack Body in `ReadMultiple` Storage-REST Endpoint in github.com/minio/minio

MinIO vulnerable to Path Traversal via msgpack Body in ReadMultiple Storage-REST Endpoint in github.com/minio/minio.

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: github.com/minio/minio from v0.0.0-20220724015452 before v0.0.0-20260414213245.

Record
GO-2026-5757
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
github.com/minio/minio
Go
 0.0.0-20220724015452 up to 0.0.0-20260414213245
0.0.0-20260414213245
github.com/minio/minio
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-2026-42600 is a medium vulnerability (CVSS 6.9) in Minio, published May 5, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 8.70%, the 95th percentile. Fixed in github.com/minio/minio 0.0.0-20260414213245.

References

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