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Response snapshot Oct 29, 2026, 02:31 UTC

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VulnerabilityCVE-2026-116583

Seroval: Code injection through a typed array's own constructor property

seroval writes a typed array as a call to its constructor. In affected versions, the constructor name in the output is read from a property that data on the value can replace, and it is written without checks.

At a glance

Exploited
Not known
Severity
5.3 Medium (CVSS 4.0)
Chance of exploitation
0.3% in the next 30 days
Sources
1 source

What to do

GitHub lists first patched versions: seroval: 1.6.11. Confirm the affected range and upgrade guidance in the exact advisory.

Read GitHub-reviewed advisory GHSA-f86p-h4j2-7qgj (opens a new tab)

What happened

Summary

seroval writes a typed array as a call to its constructor. In affected versions, the constructor name in the output is read from a property that data on the value can replace, and it is written without checks. A typed array that received properties from untrusted data can then put arbitrary code into the serialized output.

Details

Version 1.6.0 changed how seroval finds the class of an object, so that objects with their own constructor property serialize correctly. Typed arrays still took the constructor name from the value itself, so the name could come from the untrusted property instead of the array's real type.

Continue reading

These functions are affected:

- serialize, serializeAsync - crossSerialize, crossSerializeAsync, crossSerializeStream - the Serializer class - compileJSON

fromJSON and fromCrossJSON are not affected: they only accept the names of the built-in typed arrays. With the compactArrayBufferViews option, the same lookup throws a TypeError instead of writing code.

Impact

An application is affected only when it serializes a typed array that has an own constructor property set from untrusted data. That requires code that copies properties from untrusted objects onto a typed array. This is unusual, so the severity is rated Low, even though the result is script execution in the page that receives the output.

Patches

Fixed in 1.6.11. The constructor name now comes from the array's internal type, which properties on the value cannot change. compactArrayBufferViews uses the real type as well.

Workarounds

If you cannot upgrade, do not copy properties from untrusted objects onto typed arrays, or remove an own constructor property from a typed array before serializing it.

Affected package ranges reported by GitHub: seroval: >= 1.6.0, < 1.6.11

Scores and how they were measured

CVSS base severity

5.3

Version 4.0As of

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

0.3%

Scored Percentile 18.9%

Model and measurement source (opens a new tab)

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Related technology

Sources

  1. Primary source

    GitHub-reviewed advisory GHSA-f86p-h4j2-7qgj (opens a new tab)

    The public advisory supplies the description, affected package/version ranges, and any listed CVSS metric. GitHub review is not local review.

    Published Checked

  2. Primary source

    GitHub public advisory API page (opens a new tab)

    The API page supplied GHSA-f86p-h4j2-7qgj, its actual identifiers, source dates, and structured metrics.

    Published Date not suppliedChecked

  3. Primary source

    FIRST measured EPSS score (opens a new tab)

    Measured EPSS probability and percentile for CVE-2026-116583, scored 2026-10-28. This is a model estimate, not proof of exposure.

    Published Checked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, October 28). Seroval: Code injection through a typed array's own constructor property (CVE-2026-116583). https://kevwire.com/record/CVE-2026-116583

MLA

"Seroval: Code injection through a typed array's own constructor property (CVE-2026-116583)." KEVWire, 28 Oct. 2026, kevwire.com/record/CVE-2026-116583.

Chicago

KEVWire. "Seroval: Code injection through a typed array's own constructor property (CVE-2026-116583)." Last modified October 28, 2026. https://kevwire.com/record/CVE-2026-116583.

Evidence summary (plain text)

Seroval: Code injection through a typed array's own constructor property (Oct 28, 2026).
seroval writes a typed array as a call to its constructor. In affected versions, the constructor name in the output is read from a property that data on the value can replace, and it is written without checks. A typed array that received properties from untrusted data can then put arbitrary code into the serialized output.

Version 1.6.0 changed how seroval finds the class of an object, so that objects with their own constructor property serialize correctly.
CVSS 5.3 (version 4.0; evidence as of Oct 28, 2026; https://github.com/advisories/GHSA-f86p-h4j2-7qgj).
EPSS 0.3% for the following 30 days, scored Oct 28, 2026 (https://api.first.org/data/v1/epss?cve=CVE-2026-116583&date=2026-10-28).
Sources:
GitHub-reviewed advisory GHSA-f86p-h4j2-7qgj: https://github.com/advisories/GHSA-f86p-h4j2-7qgj
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc
FIRST measured EPSS score: https://api.first.org/data/v1/epss?cve=CVE-2026-116583&date=2026-10-28
Record ID: CVE-2026-116583.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Not assessed.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
About this data

This record was ingested from a data source. Retrieved: Oct 29, 2026, 02:16 UTC. Ingestion is not an independent editorial investigation.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

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Record details

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