CVE-2021-21384
In shescape before version 1.1.3, anyone using _Shescape_ to defend against shell injection may still be vulnerable against shell injection if the attacker manages to insert a into the payload.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.58%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
shescape is a simple shell escape package for JavaScript. In shescape before version 1.1.3, anyone using _Shescape_ to defend against shell injection may still be vulnerable against shell injection if the attacker manages to insert a into the payload. For an example see the referenced GitHub Security Advisory. The problem has been patched in version 1.1.3. No further changes are required.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.58% probability · 47th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-88
- Affected
- shescape project/shescape
- Source
- security-advisories@github.com
EPSS 0.6% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://github.com/ericcornelissen/shescape/commit/07a069a66423809cbedd61d980c11ca44a29ea2bPatch, Third Party Advisory
- https://github.com/ericcornelissen/shescape/releases/tag/v1.1.3Release Notes, Third Party Advisory
- https://github.com/ericcornelissen/shescape/security/advisories/GHSA-f2rp-38vg-j3ghExploit, Third Party Advisory
- https://www.npmjs.com/package/shescapeProduct
- https://github.com/ericcornelissen/shescape/commit/07a069a66423809cbedd61d980c11ca44a29ea2bPatch, Third Party Advisory
- https://github.com/ericcornelissen/shescape/releases/tag/v1.1.3Release Notes, Third Party Advisory
- https://github.com/ericcornelissen/shescape/security/advisories/GHSA-f2rp-38vg-j3ghExploit, Third Party Advisory
- https://www.npmjs.com/package/shescapeProduct
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.