Dashboard / CVE-2026-123561

CVE-2026-123561

MEDIUM
MEDIUM Priority: 0.02 BB Relevance: 73/100
Published: 2026-11-08 Modified: 2026-11-12 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

devalue before 5.9.3 allows malformed null-prototype object keys to bypass parse's __proto__ rejection through property-key coercion, an incomplete fix for GHSA-mwv9-gp5h-frr4. Attackers can supply crafted payloads that yield objects with a __proto__ own property, which alone does not cause prototype pollution.

Weakness Classification (1)

Affected Software (2)

VendorProductVersion
sveltejs devalue 0 < 5.9.3
sveltejs devalue 0 < 5.9.3

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

0.25%
Raw Score 0.002490
Percentile 16.3%
Date 2026-11-13

EPSS Trend

2026-11-13
0.00249
2026-11-12
0.00249
2026-11-10
0.00249
2026-11-09
0.00249
2026-11-08
0.00249

Intelligence Sources

mitre ref →
nvd ref →

External Links