Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
denoland deno — Deno: BYONM module resolution allows `package.json` main path traversal to bypass `--allow-read` restrictions
AV AC PR UI S C I A CVSS EPSS %ile KEV
L L L N U H N N 5.5 .0017 6.9 —
AFFECTED
Product Versions Fixed
deno < 2.7.12 – —
TIMELINE
May 29 Reserved by GitHub_M
Jun 23 EXPLOIT PUBLISHED — CVE-2026-49406 (denoland deno). Public exploit reference added.
Jun 23 Published (CNA: GitHub_M)
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.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| May 29, 2026 | Reserved | Reserved by GitHub_M |
| June 23, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-49406 (denoland deno). Public exploit reference added. |
| June 23, 2026 | Published | Published (CNA: GitHub_M) |
Affected
Affected products and packages — 1 row
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| denoland | deno | — | < 2.7.12 | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-49406 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.