CVE-2025-48934
Software relying on the combination of both flags to allow access to most environment variables except a few sensitive ones will be vulnerable to malicious code trying to steal secrets using the `Deno.env.toObject()` method.
Does this matter?
Lower severity and a low EPSS score (0.43%). Track it; it rarely justifies an emergency change on its own.
Description
Deno is a JavaScript, TypeScript, and WebAssembly runtime. Prior to versions 2.1.13 and 2.2.13, the `Deno.env.toObject` method ignores any variables listed in the `--deny-env` option of the `deno run` command. When looking at the documentation of the `--deny-env` option this might lead to a false impression that variables listed in the option are impossible to read. Software relying on the combination of both flags to allow access to most environment variables except a few sensitive ones will be vulnerable to malicious code trying to steal secrets using the `Deno.env.toObject()` method. Versions 2.1.13 and 2.2.13 contains a patch.
- CVSS 4.0
- 5.5 MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.43% probability · 36th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-201
- Affected
- deno/deno
- Source
- security-advisories@github.com
References
- https://docs.deno.com/api/deno/~/Deno.Env.toObjectProduct
- https://docs.deno.com/runtime/fundamentals/security/#environment-variablesProduct
- https://github.com/denoland/deno/commit/2959e083912420988066a001c2b2d6732a1b562fPatch
- https://github.com/denoland/deno/commit/946ccda1aa19a00c478a5e6826b75053b050d753Patch
- https://github.com/denoland/deno/pull/29079Issue Tracking, Patch
- https://github.com/denoland/deno/security/advisories/GHSA-7w8p-chxq-2789Exploit, Vendor Advisory
- https://github.com/denoland/deno/security/advisories/GHSA-7w8p-chxq-2789Exploit, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.