Dashboard / CVE-2026-123567

CVE-2026-123567

MEDIUM
MEDIUM Priority: 0.01 BB Relevance: 73/100
Published: 2026-11-08 Modified: 2026-11-13 First seen: 2026-11-08 Status: active

Attack Surface

Network Low Complexity No Auth No Interaction

CVSS Vector Breakdown

AV: Network
AC: Low
PR: None
UI: None
S: X
AT: Present
VC: None
VI: Low
VA: None

Description

Sveltejs devalue before 5.6.4 contains a prototype injection vulnerability that allows attackers to inject __proto__ own properties into objects returned by devalue.parse and devalue.unflatten. Attackers can supply crafted serialized input that, when downstream code merges results via Object.assign, alters the target object's prototype.

Weakness Classification (1)

Affected Software (2)

VendorProductVersion
sveltejs devalue 0 < 5.6.4
sveltejs devalue 0 < 5.6.4

References & Advisories (2)

Bug Bounty Relevance

73 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

6.3 / 10.0 v4.0
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS — Exploitation Probability

0.24%
Raw Score 0.002370
Percentile 14.8%
Date 2026-11-13

EPSS Trend

2026-11-13
0.00237
2026-11-12
0.00237
2026-11-10
0.00237
2026-11-09
0.00237
2026-11-08
0.00237

Intelligence Sources

mitre ref →
nvd ref →

External Links