CVE-2026-104845

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.

CVSS 3.1

7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

0.4% chance of exploitation in the next 30 days; higher than 36% of CVEs (scores of 2026-10-25)

CWE

CWE-770

Published

2026-10-02

Modified

2026-10-06

Record from

the NVD, synced 2026-10-19

Packages (OSV)

References

• https://github.com/lxsmnsyc/seroval/commit/ac0163e420ac7dcbbefac4d069bcefad300a4851
• https://github.com/lxsmnsyc/seroval/commit/e54a6f62784b9e48e3a5fa2ab4089ca69fb8996e
• https://github.com/lxsmnsyc/seroval/security/advisories/GHSA-jp82-f5mq-hwhp

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