Dashboard / CVE-2026-123564

CVE-2026-123564

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 from 1.0.0 before 5.9.3 contains a memory exhaustion flaw in uneval, whose generated code for sparse arrays allocates memory proportional to the array's declared length when evaluated. Attackers who can influence a very large sparse array serialized by an application can exhaust memory in the browser or runtime evaluating the output.

Weakness Classification (1)

Affected Software (2)

VendorProductVersion
sveltejs devalue 1.0.0 < 5.9.3
sveltejs devalue 1.0.0 < 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