CVE-2026-92708: devalue `stringify`/`uneval` Serialize Shared Memory Vulnerability

HIGH
Advisory Identifier: GHSA-j22f-vq7h-c4qm
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CVSS 7.5
CWE-200 CWE-226
Published
Advisory Summary

CVE-2026-92708 is a HIGH (CVSS 7.5) `stringify`/`uneval` serialize shared memory vulnerability (CWE-200: Exposure of Sensitive Information to an Unauthorized Actor) affecting devalue libraries in the npm ecosystem. The issue involves `stringify`/`uneval` serialize shared memory. Remediation is available by upgrading affected packages to version 5.9.3.

CVE-2026-92708 at a Glance

CVE Identifier CVE-2026-92708
GHSA Identifier GHSA-j22f-vq7h-c4qm
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
Affected Product devalue
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2026-92708

To remediate this vulnerability, upgrade all affected devalue dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

devalue fixed: 5.9.3 
npm install devalue@5.9.3
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls devalue

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2026-92708, inspect your project dependencies using npm:

npm ls devalue

Analyze the terminal output to locate any version of devalue in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 5.9.3), your application is affected.

Note: The npm ls devalue command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor, where the product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. In devalue, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Impact `stringify` and `uneval` serialize a typed array by emitting its backing `ArrayBuffer`, not just the view. In the case of a Node `Buffer` object, the backing buffer is a process-wide shared pool, meaning unrelated memory can be serialized into a response that is then sent to the client. For a Node `Buffer` the backing store is Node's **process-wide shared pool**, so serializing a small `Buffer` copies up to 64 KB of unrelated process memory — including bytes from other in-flight requests — into the output. In an SSR framework (SvelteKit, Nuxt) a public page whose `load()` returns a 2-byte `Buffer`, or a small file read with `readFileSync`, ships another user's request body / `Authorization` header in its HTML. Unauthenticated, silent, ~43,000× amplification. This is serialization-side, so the `parse`/`unflatten` prototype-pollution and DoS guards do not apply — it fires on every SSR render, not only when parsing untrusted input. ### Workarounds Convert Node `Buffer` objects to `Uint8Array`: ```diff payload = { - buffer + buffer: new Uint8Array(buffer) } ```

CVE-2026-92708 Affected devalue Versions

1 component(s)
Fixed Versions:
5.9.3
Product / Package Ecosystem Affected Versions Fixed Version
devalue
npm/devalue
npm
≥ 5.1.0
< 5.9.3
5.9.3

References

GitHub Advisory / Wiki ADVISORY
https://github.com/sveltejs/devalue/security/advisories/GHSA-j22f-vq7h-c4qm
NVD — CVE-2026-92708 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-92708
Security Fix Commit FIX COMMIT
https://github.com/sveltejs/devalue/commit/46dc877b3570dafb1cd3291b9bb48cecef8f7266
devalue Source Repository REPOSITORY
https://github.com/sveltejs/devalue
devalue Release RELEASE
https://github.com/sveltejs/devalue/releases/tag/v5.9.3

Frequently Asked Questions

What is CVE-2026-92708?
CVE-2026-92708 is a security vulnerability in devalue involving `stringify`/`uneval` serialize shared memory under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor.
Which devalue versions are affected?
Affected versions include releases prior to 5.9.3 across affected packages: devalue.
What version fixes CVE-2026-92708?
Upgrading to 5.9.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is devalue affected?
Yes, devalue is affected in releases prior to 5.9.3. Upgrade your dependency to 5.9.3 or later.
What is the CVSS score of CVE-2026-92708?
CVE-2026-92708 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2026-92708?
CVE-2026-92708 is classified under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor (The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.).
How can I check npm dependencies for CVE-2026-92708?
Run the dependency tree command: 'npm ls devalue'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-j22f-vq7h-c4qm",
  "modified" : "2026-10-01T15:18:06Z",
  "published" : "2026-10-01T15:18:06Z",
  "aliases" : [ "CVE-2026-92708" ],
  "summary" : "devalue: `stringify`/`uneval` serialize shared memory",
  "details" : "### Impact\n\n`stringify` and `uneval` serialize a typed array by emitting its backing `ArrayBuffer`, not just the view. In the case of a Node `Buffer` object, the backing buffer is a process-wide shared pool, meaning unrelated memory can be serialized into a response that is then sent to the client. For a Node `Buffer` the backing store is Node's **process-wide shared pool**, so serializing a small `Buffer` copies up to 64 KB of unrelated process memory — including bytes from other in-flight requests — into the output. In an SSR framework (SvelteKit, Nuxt) a public page whose `load()` returns a 2-byte `Buffer`, or a small file read with `readFileSync`, ships another user's request body / `Authorization` header in its HTML. Unauthenticated, silent, ~43,000× amplification.\n\nThis is serialization-side, so the `parse`/`unflatten` prototype-pollution and DoS guards do not apply — it fires on every SSR render, not only when parsing untrusted input.\n\n### Workarounds\n\nConvert Node `Buffer` objects to `Uint8Array`:\n\n```diff\npayload = {\n- buffer\n+ buffer: new Uint8Array(buffer)\n}\n```",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "devalue"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "5.1.0"
      }, {
        "fixed" : "5.9.3"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 5.9.2"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/sveltejs/devalue/security/advisories/GHSA-j22f-vq7h-c4qm"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-92708"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/sveltejs/devalue/commit/46dc877b3570dafb1cd3291b9bb48cecef8f7266"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/sveltejs/devalue"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/sveltejs/devalue/releases/tag/v5.9.3"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-200", "CWE-226" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-10-01T15:18:06Z",
    "nvd_published_at" : "2026-09-18T20:17:30Z"
  }
}