CVE-2026-21637
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2026
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
A flaw in Node.js TLS error handling allows remote attackers to crash or exhaust resources of a TLS server when `pskCallback` or `ALPNCallback` are in use. Synchronous exceptions thrown during these callbacks bypass standard TLS error handling paths (tlsClientError and error), causing either immediate process termination or silent file descriptor leaks that eventually lead to denial of service. Because these callbacks process attacker-controlled input during the TLS handshake, a remote client can repeatedly trigger the issue. This vulnerability affects TLS servers using PSK or ALPN callbacks across Node.js versions where these callbacks throw without being safely wrapped.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
node
- Vendor
- nodejs
- Product
- node
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 20.19.6 | affected | semver | Unavailable | 20.19.6 | None listed |
| 22.21.1 | affected | semver | Unavailable | 22.21.1 | None listed |
| 24.12.0 | affected | semver | Unavailable | 24.12.0 | None listed |
| 25.2.1 | affected | semver | Unavailable | 25.2.1 | None listed |
| 4.0 | affected | semver | 4.* | Unavailable | None listed |
| 5.0 | affected | semver | 5.* | Unavailable | None listed |
| 6.0 | affected | semver | 6.* | Unavailable | None listed |
| 7.0 | affected | semver | 7.* | Unavailable | None listed |
| 8.0 | affected | semver | 8.* | Unavailable | None listed |
| 9.0 | affected | semver | 9.* | Unavailable | None listed |
| 10.0 | affected | semver | 10.* | Unavailable | None listed |
| 11.0 | affected | semver | 11.* | Unavailable | None listed |
| 12.0 | affected | semver | 12.* | Unavailable | None listed |
| 13.0 | affected | semver | 13.* | Unavailable | None listed |
| 14.0 | affected | semver | 14.* | Unavailable | None listed |
| 15.0 | affected | semver | 15.* | Unavailable | None listed |
| 16.0 | affected | semver | 16.* | Unavailable | None listed |
| 17.0 | affected | semver | 17.* | Unavailable | None listed |
| 18.0 | affected | semver | 18.* | Unavailable | None listed |