CVE-2023-26920

Exp

fast-xml-parser before 4.1.2 allows __proto__ for Prototype Pollution.

Published: 2023-12-12 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-26920 is rated Exploit Available (54.5/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.17%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2023-26920

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2023-26920

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-11-21 0.32% 0.17% -0.15%
2 2025-11-18 0.17% 0.32% +0.16%
3 2025-04-15 — 0.17% —

Full EPSS history (8 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-26920

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 3.6 [email protected]

Weakness enumeration for CVE-2023-26920

GitHub Security Advisory for CVE-2023-26920

GHSA-x3cc-x39p-42qx · Severity: medium · Ecosystem: npm — fast-xml-parser vulnerable to Prototype Pollution through tag or attribute name

OS Trackers for CVE-2023-26920

vendor priority summary link
debian not yet assigned CVE-2023-26920 not yet assigned priority: Debian including 1 source packages (node-webfont), 4 status rows across 4 suites (bookworm, forky, sid, trixie): undetermined 4. https://security-tracker.debian.org/tracker/CVE-2023-26920
ubuntu medium CVE-2023-26920 medium priority: Ubuntu including 1 source packages (node-webfont), 4 status rows across 4 suites (jammy, noble, questing, upstream): needs-triage 3, DNE 1. https://ubuntu.com/security/CVE-2023-26920

Affected software / configurations for CVE-2023-26920

Vendor Product Version Raw CPE
naturalintelligence fast_xml_parser < 4.1.2 cpe:2.3:a:naturalintelligence:fast_xml_parser:*:*:*:*:*:*:*:*

References for CVE-2023-26920

cvelogic Threat Intelligence