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HIGH severity

Seroval `fromJSON`/`fromCrossJSON` denial of service via unvalidated array node lengthGHSA-wp97-x4hv-qvhp

HIGHFix: lxsmnsyc/seroval@cdcee3e

GHSA-wp97-x4hv-qvhp is a high-severity (CVSS 7.5) CWE-770 vulnerability in seroval. A fix is available for seroval — see the affected versions and patch details below.

Also known asCVE-2026-116584
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 27, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs30th percentile — riskier than 30% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

GHSA-wp97-x4hv-qvhp by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 396,966 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

67other npm packages depend on this — each one inherits the vulnerability until it's patched upstream
serovalnpm
22.1Mdownloads / week

Description

Summary

fromJSON and fromCrossJSON did not check that an array node's element list is an array. A small crafted payload could set the length the decoder used. That length controlled how much memory was allocated and how many times the decoder looped, and it did not depend on the size of the payload.

Impact

A service that passes untrusted input to fromJSON or fromCrossJSON can be made unavailable by an unauthenticated request.

  • A small payload can allocate enough memory to end the process.
  • A small payload can block the thread for seconds, or without end.

This affects any framework that decodes request bodies with these functions before its own validation runs.

This issue is a bypass of the fix for GHSA-66fc-rw6m-c2q6 in 1.4.1.

Patches

Fixed in [email protected]. The deserializer now rejects any node whose element list is not an array, and throws SerovalMalformedNodeError.

Workarounds

None. Upgrade to 1.6.8.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npmseroval≥ 1.4.1&&< 1.6.81.6.8npm install seroval@1.6.8

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for seroval, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update seroval to 1.6.8 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-wp97-x4hv-qvhp is resolved across your whole dependency graph.

  3. Workarounds

    Do not deserialise data from untrusted sources: where the format allows it, restrict deserialisation to an explicit allowlist of expected types, and prefer a data-only format (JSON, Protobuf) over one that can reconstruct arbitrary objects until you can upgrade.

Frequently Asked Questions

### Summary `fromJSON` and `fromCrossJSON` did not check that an array node's element list is an array. A small crafted payload could set the length the decoder used. That length controlled how much memory was allocated and how many times the decoder looped, and it did not depend on the size of the payload. ### Impact A service that passes untrusted input to `fromJSON` or `fromCrossJSON` can be made unavailable by an unauthenticated request. - A small payload can allocate enough memory to end the process. - A small payload can block the thread for seconds, or without end. This affects any
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Seroval `fromJSON`/`fromCrossJSON` denial of service via…