CVE-2026-85731

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2026-85731
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-85731.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-85731
Aliases
Downstream
CGA (328)
CLEANSTART (3)
DEBIAN (1)
ECHO (1)
MINI (181)
openSUSE (1)
ROOT (1)
SUSE (1)
UBUNTU (1)
Related
Published
2026-09-16T16:24:48Z
Modified
2026-10-28T02:30:39Z
Severity
  • 8.8 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H CVSS Calculator
Summary
oras-go: Arbitrary file write outside file.Store root via symlink-chain bypass in tar extraction (pushDir)
Details

oras-go is a Go library for managing OCI artifacts. Prior to 2.6.2, content/file.Store extraction of OCI layers marked with io.deis.oras.content.unpack=true can write outside the store working directory. The pushDir path through extractTarDirectory and ensureLinkPath validates symlink targets lexically, resolveRelToBase skips its parent-symlink walk for root-level entries, and writeFile follows a terminal symlink when opening a regular file. A malicious archive can therefore create a symlink chain whose lexical target remains inside the extraction root but whose resolved target is an attacker-selected absolute path, then overwrite that target with a same-named regular-file entry even when AllowPathTraversalOnWrite is false. Pulling an attacker-controlled artifact can create or overwrite any file writable by the process and may lead to code execution. This issue is fixed in version 2.6.2.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-22",
        "CWE-59"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85731.json"
}
References

Affected packages

Git / github.com/oras-project/oras-go

Affected ranges

Type
GIT
Repo
https://github.com/oras-project/oras-go
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
105715ee12eac6895ec736a075285c34d9f2eeb6
Fixed
adab2f25ea95ef4e6e41f50db9266a6701399422
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "2.6.2"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StringRangeExpression"
        },
        {
            "range":  [
                {
                    "fixed":  "adab2f25ea95ef4e6e41f50db9266a6701399422"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "original_tag":  "v2.6.2",
            "range":  [
                {
                    "fixed":  "105715ee12eac6895ec736a075285c34d9f2eeb6"
                }
            ],
            "source":  "REFERENCES_TAG"
        }
    ]
}

Affected versions

v0.*
v0.1.0
v0.2.0
v0.3.0
v0.4.0
v0.5.0
v2.*
v2.0.0
v2.0.0-alpha
v2.0.0-rc.1
v2.0.0-rc.2
v2.0.0-rc.3
v2.0.0-rc.4
v2.0.0-rc.5
v2.0.0-rc.6
v2.0.1
v2.0.2
v2.1.0
v2.2.0
v2.3.0
v2.4.0
v2.5.0
v2.6.0
v2.6.1

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-85731.json"