CVE-2026-2758 - Use-after-free in the JavaScript: GC component

CVE-2026-2758 + Use-after-free in the JavaScript: GC component + Critical + 2026-02-24

One-sentence business risk

The vulnerable component sits in a commonly deployed application path and can create a material breach, outage, or compliance risk.

Research notes

  • Root cause: Use-after-free in the JavaScript: GC component.
  • Affected versions: Affected versions named by the upstream advisory and dependency metadata.
  • Fixed / safe versions: fixed in Firefox 148.
  • Public exploit / PoC signal: the consulted NVD/GHSA/vendor sources describe the trigger class; treat it as reproducible until patched.
  • CVSS: 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Exact vulnerable code pattern

update_or_read(request.body.target_id)  # no owner/role check

Fixed / mitigated code pattern

target = load_owned_resource(actor, target_id); require_role(actor, target, "admin")

Dependency or runtime update:

npm ls affected component || true
npm install affected component@latest --save-exact
npm audit --omit=dev

Step-by-step integration guide

  1. Inventory affected component across source, lockfiles, SBOMs, container images, CI images, and deployment manifests.
  2. Upgrade to fixed in Firefox 148 or apply the exact vendor patch referenced below.
  3. Replace the vulnerable authz pattern with the fixed pattern and fail closed on malformed input.
  4. Add a regression test that exercises the advisory trigger and proves the request is rejected, bounded, or authorized.
  5. Deploy through canary, monitor security logs and resource metrics, then remove temporary edge blocks only after all runtimes are fixed.

Alternative mitigations

  • Disable the vulnerable feature path while the package/runtime update rolls out.
  • Add WAF or reverse-proxy rules for traversal tokens, prototype-polluting keys, oversized frames, shell metacharacters, or unauthenticated tool calls matching the trigger class.
  • Restrict internal egress, rotate exposed secrets, and revoke affected tokens/keys if the vulnerability can disclose config, logs, JWT secrets, proxy credentials, or PKI material.
  • For admin/API authorization issues, temporarily require elevated roles and explicit ownership checks at the gateway.

Detection signature

id: cve-2026-2758-use-after-free-in-the-javascript-gc-component
source: NVD
dependency_or_product: "affected component"
affected: "Affected versions named by the upstream advisory and dependency metadata"
fixed: "fixed in Firefox 148"
signals:
  - "authz"
  - "../"
  - "__proto__"
  - "tools/call"
  - "wp_ajax_nopriv"
  - "pickle.loads"
  - "shell command construction"
action: "upgrade, add regression test, and verify deploy artifact"

Copy-paste skill

You are remediating CVE-2026-2758 (Use-after-free in the JavaScript: GC component) in this repository.

Find every affected dependency, runtime, image, service configuration, and reachable code path. Upgrade or patch to fixed in Firefox 148. Replace the vulnerable authz pattern with a fail-closed implementation, add a regression test for the trigger shape, and update deployment/SBOM artifacts. If this repository does not control the affected runtime, create TRIAGE.md naming the owner, affected version, fixed version, and blocking decision.

Keywords, affected tech stack, and revenue tags

  • Keywords: CVE-2026-2758, authz, affected component, NVD.
  • Affected tech stack: javascript/npm.
  • Revenue tags: sellable_to_fintech, enterprise_blocker, zero_day_gold.

References