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CVE-2026-50163— oras-go: Hardlink entry with relative Linkname escapes extract dir via process CWD resolution in `oras-go` tar extraction

Quick assessment

Affected
oras-project oras-go
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

oras-project oras-go是oras-project组织的一个基于OCI标准的内容分发库软件。 oras-project oras-go 2.6.2之前版本存在安全漏洞，该漏洞源于ensureLinkPath函数验证硬链接目标时返回未解析的目标，可能导致暴露或篡改文件。

CVSS 7.1 · High EPSS 0.35% · P27

Affected Version Matrix 1

VendorProduct Version RangeStatus
oras-project oras-go < 2.6.2 affected
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I. Basic Information for CVE-2026-50163

Vulnerability Information
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Vulnerability Title
oras-go: Hardlink entry with relative Linkname escapes extract dir via process CWD resolution in `oras-go` tar extraction
Source: CVE Program / CVE List V5
Vulnerability Description
oras-go is a Go library for managing OCI artifacts. Prior to 2.6.2, ensureLinkPath in content/file/utils.go:262-275 validates a hardlink target relative to the extract base but returns the unresolved target, causing os.Link("victim.secret", "<extract_base>/payload.tar.gz/evil_cwd_link") to resolve header.Linkname against the process current working directory for a Typeflag=TypeLink entry such as Name=payload.tar.gz/evil_cwd_link and Linkname="victim.secret" with io.deis.oras.content.unpack: "true", which can expose or tamper with files such as .env, .git/config, .aws/credentials, and ~/.ssh/config. This issue is fixed in version 2.6.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
oras-project oras-go 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
oras-project oras-go是oras-project组织的一个基于OCI标准的内容分发库软件。 oras-project oras-go 2.6.2之前版本存在安全漏洞，该漏洞源于ensureLinkPath函数验证硬链接目标时返回未解析的目标，可能导致暴露或篡改文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
oras-project oras-go < 2.6.2 -

II. Public POCs for CVE-2026-50163

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
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claude_code · 12466 chars
GitHub 复现环境（可 clone 直接跑）
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POC zip download
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III. Intelligence Information for CVE-2026-50163

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Patches & Fixes for CVE-2026-50163 (3)

Vendor Advisories for CVE-2026-50163 (1)

Same Patch Batch · oras-project · 2026-07-17 · 4 CVEs total

CVE-2026-50151 7.5 HIGH oras-go: credential forwarding via unvalidated Location header in blob upload
CVE-2026-48978 oras-go: Malicious registry can hijack Bearer token realm to exfiltrate credentials and re
CVE-2026-50162 oras-go: file store write outside workingDir via symlink traversal

IV. Related Vulnerabilities

Same product: oras-go
Same vendor: oras-project
Same weakness: CWE-22

V. Comments for CVE-2026-50163

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