CVE-2023-26920 json
fast-xml-parser before 4.1.2 allows __proto__ for Prototype Pollution.
published 2023-12-12 2 y ago modified 2026-06-17 4 mo ago also EUVD-2023-1910
- cvss
- 6.5
- version 3.1, NVD
- 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
fast-xml-parser before 4.1.2 allows __proto__ for Prototype Pollution.
Patch / fix
- naturalintelligence fast_xml_parser 4.1.2
Exploit prediction
1.15% chance of exploitation in the next 30 days, higher than 67% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- gist.github.com https://gist.github.com/Sudistark/a5a45bd0804d522a1392cb5023aa7ef7 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
Classification
- Weakness
-
- CWE-1321 Improperly Controlled Modification of Object Prototype Attributes
References
Sources
- CVE List CVE-2023-26920
- NVD CVE-2023-26920
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.