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CVE-2026-104845— Seroval: Memory exhaustion via unchecked TypedArray length in JSON deserialization

Quick assessment

Affected
lxsmnsyc seroval
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Seroval 支持 JavaScript 值的字符串化（stringification），包括超出 JSON.stringify 能力范围的复杂结构。在版本 1.6.3 之前， 和 中的 函数将反序列化后的源值视为 ArrayBuffer，且未对序列化后的元素数量设置上限。攻击者可以提供一个具有较大 length 值的小型不受信任的 JSON 对象，从而导致类似数组的 TypedArray 构造函数同步分配指定数量的元素，进而耗尽 CPU 或内存资源，并导致事件循环（event loop）饥饿。由于 为 unde

CVSS 7.5 · High EPSS 0.43% · P35

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
lxsmnsyc seroval < 1.6.3 affected
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I. Basic Information for CVE-2026-104845

Vulnerability Information
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Vulnerability Title
Seroval: Memory exhaustion via unchecked TypedArray length in JSON deserialization
Source: CVE Program / CVE List V5
Vulnerability Description
Seroval facilitates JS value stringification, including complex structures beyond JSON.stringify capabilities. Prior to 1.6.3, deserializeTypedArray in fromJSON and fromCrossJSON trusts a deserialized source value as an ArrayBuffer and does not bound the serialized element count. An attacker can provide a small untrusted JSON object with a large length value, causing the array-like TypedArray constructor to synchronously allocate the selected number of elements and exhaust CPU or memory while starving the event loop. The offset check does not reject the crafted source because source.byteLength is undefined. DataView reaches a similar unchecked cast but throws rather than allocating, and the issue has no identified confidentiality or integrity impact. This issue is fixed in version 1.6.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
lxsmnsyc seroval < 1.6.3 -

II. Public POCs for CVE-2026-104845

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III. Intelligence Information for CVE-2026-104845

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Patches & Fixes for CVE-2026-104845 (2)

Vendor Advisories for CVE-2026-104845 (1)

IV. Related Vulnerabilities

Same product: seroval
Same vendor: lxsmnsyc
Same weakness: CWE-770

V. Comments for CVE-2026-104845

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