CVE-2021-4279 json
Starcounter-Jack JSON-Patch prototype pollution
published 2022-12-25 3 y ago modified 2026-06-17 4 mo ago also GHSA-8gh8-hqwg-xf34 , EUVD-2022-7564
- cvss
- 6.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.2%
- EPSS 1.2% chance of exploitation in 30 days, percentile 67%
- public exploits
- 0
- none known
Summary
A vulnerability has been found in Starcounter-Jack JSON-Patch up to 3.1.0 and classified as problematic. This vulnerability affects unknown code. The manipulation leads to improperly controlled modification of object prototype attributes ('prototype pollution'). The attack can be initiated remotely. The exploit has been disclosed to the public and may be used. Upgrading to version 3.1.1 is able to address this issue. The name of the patch is 7ad6af41eabb2d799f698740a91284d762c955c9. It is recommended to upgrade the affected component. VDB-216778 is the identifier assigned to this vulnerability.
Patch / fix
- npm fast-json-patch 3.1.1
- starcounter-jack json-patch 3.1.1
Exploit prediction
1.16% chance of exploitation in the next 30 days, higher than 67% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/Starcounter-Jack/JSON-Patch/pull/262 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L |
| CNA | 3.0 | 6.3 | CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L |
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| GitHub | 3.1 | 7.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | fast-json-patch | <3.1.1 |
3.1.1 |
Affected products
- Starcounter-Jack JSON-Patch
Classification
- Weakness
-
- CWE-1321 Improperly Controlled Modification of Object Prototype Attributes
References
-
github.com
/Starcounter-Jack/JSON-Patch/pull/262
exploit, issue-tracking, patch, web, third-party-advisory
-
github.com
/Starcounter-Jack/JSON-Patch/commit/7ad6af41eabb2d799f698740a91284d762c955c9
patch, web, third-party-advisory
-
github.com
/Starcounter-Jack/JSON-Patch/releases/tag/3.1.1
patch, web, release-notes, third-party-advisory
-
vuldb.com
/?id.216778
vdb-entry, web, third-party-advisory
-
vuldb.com
/?ctiid.216778
signature, permissions-required, web, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-4279
advisory
-
blog.effectrenan.com
/pwn2win-2021-illusion-web-challenge
web
-
github.com
/Starcounter-Jack/JSON-Patch
package
-
huntr.dev
/bounties/1-npm-fast-json-patch
web
Sources
- CVE List CVE-2021-4279
- GitHub Advisory GHSA-8gh8-hqwg-xf34
- NVD CVE-2021-4279
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.