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CVE-2026-49406

MEDIUM Exploitation: PoC
5.5
CVSS 3.1
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.

Metadata

CVE ID
CVE-2026-49406
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-05-29 19:08 UTC
Published
2026-06-23 17:19 UTC
Last updated
2026-06-23 17:50 UTC
Primary CWE
CWE-22
CWE-22: Improper Limitation of a Pathname to a Restricted Di…
Vendor / Product
denoland / deno
Sources
cve.org  ·  NVD

Severity & Metrics

5.5 MEDIUM CVSS 3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
SSVC — CISA Coordinator
Exploitation
PoC
Automatable
no
Tech. Impact
partial
Affected products (1)
VendorProductPlatformVersions
denoland deno — < 2.7.12
Weakness (CWE)
CWESourceDescription
CWE-22 cna CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CVSS scores (1)
ScoreSeverityVersionSourceVector
5.5 MEDIUM 3.1 cna CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
References (1)
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