Dashboard / CVE-2026-123566

CVE-2026-123566

HIGH
MEDIUM Priority: 0.03 BB Relevance: 77/100
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: None
VC: None
VI: None
VA: High

Description

Sveltejs devalue before 5.9.3 contains a denial of service vulnerability that allows attackers to cause CPU amplification by supplying sparse arrays to uneval. Attackers who influence sparse values passed to uneval can force synchronous work proportional to the declared array length, blocking the event loop.

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

77 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

8.7 / 10.0 v4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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

0.34%
Raw Score 0.003430
Percentile 28.3%
Date 2026-11-13

EPSS Trend

2026-11-13
0.00343
2026-11-12
0.00343
2026-11-10
0.00343
2026-11-09
0.00343
2026-11-08
0.00343

Intelligence Sources

mitre ref →
nvd ref →

External Links