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TI-2026-36568 Aliases CVE-2026-49406GHSA-968w-xfqw-vp9q

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

Priority MEDIUM 58CWE-22Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-22 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00176 7th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed deno (denoland): 2.7.12deno (crates.io): 2.7.12

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
denolanddenobefore 2.7.122.7.12Patch availableCNA
—deno (crates.io)before 2.7.122.7.12Patch availableGHSA-968w-xfqw-vp9q
  • deno Vendordenoland Affected before 2.7.12 Fixed in 2.7.12 Patch available CNA
  • deno (crates.io) Vendor— Affected before 2.7.12 Fixed in 2.7.12 Patch available GHSA-968w-xfqw-vp9q

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:deno:deno:*:*:*:*:*:*:*:*before 2.7.12Vulnerabledenoland
  • cpe:2.3:a:deno:deno:*:*:*:*:*:*:*:* Versions before 2.7.12 Vulnerable ·denoland

Remediation

  • Fix · CNA deno (denoland) Fixed in 2.7.12
  • Fix · GHSA-968w-xfqw-vp9q deno (crates.io) Fixed in 2.7.12 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-49406
  2. 2026-10-03 Alias added: GHSA-968w-xfqw-vp9q

References

Exploit 1

Advisory 1

Other 1

  • TI-2026-21627 Deno has a Command Injection via Incomplete shell metacharacter blocklist in node:child_process CVSS 3.1CRITICAL 9.8
  • TI-2025-17782 Deno's AES GCM authentication tags are not verified CVSS 4.0HIGH 7.7
  • TI-2024-18537 *const c_void / ExternalPointer unsoundness leading to use-after-free CVSS 3.1HIGH 8.8
  • TI-2024-18536 Deno arbitrary file descriptor close via `op_node_ipc_pipe()` leading to permission prompt bypass CVSS 3.1HIGH 8.8
  • TI-2023-12990 Deno is vulnerable to interactive `run` permission prompt spoofing via improper ANSI neutralization CVSS 3.1HIGH 8.8
  • TI-2023-11328 Regular expression denial of service in deno CVSS 3.1HIGH 7.5
See all 37 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences