How severe is GHSA-r9w8-h9r3-54w4?

No CVSS score has been assigned to GHSA-r9w8-h9r3-54w4 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-r9w8-h9r3-54w4?

GHSA-r9w8-h9r3-54w4 affects the following packages: devalue (npm). Ecosystems affected: npm.

How do I fix GHSA-r9w8-h9r3-54w4?

Update devalue to 5.9.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-r9w8-h9r3-54w4 is resolved across your whole dependency graph.

How do I detect GHSA-r9w8-h9r3-54w4 in my npm dependencies?

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

How do I mitigate GHSA-r9w8-h9r3-54w4 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Is GHSA-r9w8-h9r3-54w4 actively exploited in the wild?

No public exploit code has been indexed for GHSA-r9w8-h9r3-54w4 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

When was GHSA-r9w8-h9r3-54w4 published, and has it been updated?

GHSA-r9w8-h9r3-54w4 was published on October 1, 2026 and was last updated on October 1, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

📦 npm

Not in CISA KEV

devalue: Custom ArrayBuffer revivers can bypass typed-array allocation validationGHSA-r9w8-h9r3-54w4

Fix: sveltejs/devalue@8f8d78e

GHSA-r9w8-h9r3-54w4 is a security vulnerability in devalue. A fix is available for devalue — see the affected versions and patch details below.

Published

Oct 1, 2026

Updated

Oct 1, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Oct 1, 2026 · OSV.dev, FIRST.org (EPSS)

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.

377other npm packages depend on this — each one inherits the vulnerability until it's patched upstream

devaluenpm

11.0Mdownloads / week

Description

Under very specific circumstances, parse could create massive ArrayBuffers with very small input. This required a malformed ArrayBuffer custom reviver.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
📦npm	`devalue`	all versions	5.9.3`npm install devalue@5.9.3`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for devalue, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update devalue to 5.9.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-r9w8-h9r3-54w4 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

Under very specific circumstances, `parse` could create massive ArrayBuffers with very small input. This required a malformed `ArrayBuffer` custom reviver.

O3 Security · Impact-Aware SCA

Is GHSA-r9w8-h9r3-54w4 in your dependencies?

Find it across npm, including transitive dependencies.

Scan my dependencies How O3 SCA works