Timing side-channel in HMAC verification in Node.js
| Advisory ID | CVE Number | Date discovered | Severity | Advisory revision |
|---|---|---|---|---|
| STORM-2026-009 | CVE-2026-21713 | 03/24/2026 | medium | v1 |
Vulnerability details
A flaw in Node.js HMAC verification can potentially leaking timing information
Impacted products
| Products | Severity | Detail |
|---|---|---|
| Stormshield Management Center | medium | SMC is impacted |
Revisions
| Version | Date | Description |
|---|---|---|
| v1 | 04/22/2026 | Initial release |
Stormshield Management Center |
CVSS v3.1 Overall Score: 5.2
|
Analysis |
Impacted version |
|
SMC is not directly affected by this vulnerability, but a component used by the project is affected |
|
Workaround solution |
Solution |
|
There is no workaround solution. |
The SMC 3.9.1 update will fix this vulnerability. |
| Attack Vector | Attack Complexity | Privileges Required | User Interaction | Scope | Confidentiality Impact | Integrity Impact | Availability impact |
|---|---|---|---|---|---|---|---|
| Adjacent Network | High | High | None | Unchanged | High | Low | Low |
| CVSS Base score: 5.3 | CVSS Vector: (AV:A/AC:H/PR:H/UI:N/S:U/C:H/I:L/A:L) |
| Exploit Code Maturity | Remediation Level | Report Confidence |
|---|---|---|
| Unproven that exploit exists | Official fix | Confirmed |
| CVSS Temporal score: 4.6 | CVSS Vector: (AV:A/AC:H/PR:H/UI:N/S:U/C:H/I:L/A:L/E:U/RL:O/RC:C) |
| Attack Vector (MAV) | Attack Complexity (MAC) | Privileges Required (MPR) | User Interaction (MUI) | Scope (MS) |
|---|---|---|---|---|
| Adjacent Network | High | High | None | Unchanged |
| Confidentiality Impact (MC) | Integrity Impact (MI) | Availability Impact (MA) |
|---|---|---|
| High | None | None |
| Confidentiality Requirement (CR) | Integrity Requirement (IR) | Availability Requirement (AR) |
|---|---|---|
| High | Low | Low |
| CVSS Environmental score: 5.2 | CVSS Vector: (AV:A/AC:H/PR:H/UI:N/S:U/C:H/I:L/A:L/E:U/RL:O/RC:C/CR:H/IR:L/AR:L/MAV:X/MAC:X/MPR:X/MUI:X/MS:X/MC:X/MI:X/MA:X) |