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CVE-2026-49406— Deno: BYONM module resolution allows `package.json` main path traversal to bypass `--allow-read` restrictions

Quick assessment

Affected
denoland deno
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Deno是Deno组织开源的一个简单、现代且安全的 JavaScript 和 TypeScript 运行环境。 Deno Land Deno 2.7.12之前版本存在路径遍历漏洞，该漏洞源于模块解析器在BYONM模式下未验证包的入口点是否在node_modules/<pkg>/目录内，导致恶意package.json中的..段可解析到磁盘上的任意路径，并绕过--allow-read白名单读取文件。

CVSS 5.5 · Medium EPSS 0.18% · P6

Affected Version Matrix 1

VendorProduct Version RangeStatus
denoland deno < 2.7.12 affected
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I. Basic Information for CVE-2026-49406

Vulnerability Information
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Vulnerability Title
Deno: BYONM module resolution allows `package.json` main path traversal to bypass `--allow-read` restrictions
Source: CVE Program / CVE List V5
Vulnerability Description
Deno is a JavaScript, TypeScript, and WebAssembly runtime. Prior to 2.7.12, when Deno was run in BYONM mode (nodeModulesDir: "manual"), the module resolver did not validate that a package's resolved entrypoint stayed within its node_modules/<pkg>/ directory. A malicious package.json whose main field contained .. segments was able to resolve to an arbitrary path on disk, and the resolver then read that file without consulting the --allow-read allowlist. This let a require("evil-pkg") call return the contents of a file that a direct Deno.readTextFileSync(...) call would have been blocked from reading. This vulnerability is fixed in 2.7.12.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/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
Deno Land Deno 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Deno是Deno组织开源的一个简单、现代且安全的 JavaScript 和 TypeScript 运行环境。 Deno Land Deno 2.7.12之前版本存在路径遍历漏洞，该漏洞源于模块解析器在BYONM模式下未验证包的入口点是否在node_modules/<pkg>/目录内，导致恶意package.json中的..段可解析到磁盘上的任意路径，并绕过--allow-read白名单读取文件。
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
denoland deno < 2.7.12 -

II. Public POCs for CVE-2026-49406

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III. Intelligence Information for CVE-2026-49406

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Vendor Advisories for CVE-2026-49406 (1)

Same Patch Batch · denoland · 2026-06-23 · 10 CVEs total

CVE-2026-49402 8.1 HIGH Deno: Command Injection via spawnSync & spawn on Windows
CVE-2026-49440 7.4 HIGH Deno: Miller-Rabin Primality Test Allows Zero Rounds
CVE-2026-44726 7.4 HIGH Deno: TLS retry copies stale upgrade hook, risking plaintext traffic
CVE-2026-49401 7.3 HIGH Deno Permission Bypass via Unicode Normalization Mismatch on macOS (APFS)
CVE-2026-49411 6.5 MEDIUM Deno Node TCPWrap numeric hostname aliases bypass --deny-net resolved-IP deny checks
CVE-2026-49983 5.2 MEDIUM Deno: process.loadEnvFile() bypasses env permission checks and mutates process.env with on
CVE-2026-49860 5.2 MEDIUM Deno: WebSocket API sandbox bypass via missing post-DNS check
CVE-2026-49859 5.2 MEDIUM Deno: `fetch()` API sandbox bypass via missing DNS resolution check
CVE-2026-55517 4.3 MEDIUM Deno: Denial of service via non-ASCII bytes in WebSocket response headers

IV. Related Vulnerabilities

Same product: deno
Same vendor: denoland
Same weakness: CWE-22

V. Comments for CVE-2026-49406

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