CVE-2026-49401 json
Deno Permission Bypass via Unicode Normalization Mismatch on macOS (APFS)
published 2026-06-16 4 mo ago modified 2026-10-25 14 d ago also EUVD-2026-38547 , GHSA-8xpq-cjcf-3wh9 , JLSEC-2026-655
- cvss
- 7.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 9%
- public exploits
- 0
- none known
Summary
Deno is a JavaScript, TypeScript, and WebAssembly runtime. Prior to 2.7.14, Deno's permission system enforces filesystem and execution restrictions by comparing the requested path against the path supplied to --deny-read, --deny-write, --deny-run, or --deny-ffi. On macOS, that comparison was done at the raw-byte level while the APFS filesystem treats different Unicode spellings of the same name as the same file. That means a program could reach a denied path by spelling it differently than the deny rule. This vulnerability is fixed in 2.7.14.
Patch / fix
- crates.io deno 2.7.14
- julia Deno_jll 2.8.1+0
- deno deno 2.7.14
- deno deno_runtime 2.7.14
- deno serde_v8 2.7.14
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 4 mo ago
Exploit prediction
0.20% chance of exploitation in the next 30 days, higher than 9% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/denoland/deno/security/advisories/GHSA-8xpq-cjcf-3wh9 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.3 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N |
| GitHub | 3.1 | 7.3 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N |
| NVD | 3.1 | 8.4 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N |
| OSV | 3.1 | 8.4 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| crates.io | deno | <2.7.14 |
2.7.14 |
| julia | Deno_jll | <2.8.1+0 |
2.8.1+0 |
Affected products
- denoland deno
Classification
References
-
github.com
/denoland/deno/security/advisories/GHSA-8xpq-cjcf-3wh9
web, exploit, mitigation, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-49401
advisory
-
github.com
/denoland/deno
package
-
github.com
/advisories/GHSA-8xpq-cjcf-3wh9
web
Sources
- CVE List CVE-2026-49401
- GitHub Advisory GHSA-8xpq-cjcf-3wh9
- NVD CVE-2026-49401
- OSV JLSEC-2026-655
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.