nodejs vulnerabilities

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Latest nodejs CVEs

Newest publication first · page 4 of 13

1. CVE-2026-6733 undici vulnerable to HTTP response queue poisoning via keep-alive socket reuse

   Published 2026-06-17

   Low·CVSS 3.7 EPSS 0.22%

   Impact: Undici's HTTP/1.1 client is vulnerable to response queue poisoning on reused keep-alive sockets. An attacker-controlled upstream server can inject an unsolicited HTTP/1.1 response onto an idle socket after a request completes. When the client dispatches the next request o...

2. CVE-2026-9678 undici vulnerable to cross-user information disclosure via shared cache whitespace bypass

   Published 2026-06-17

   Medium·CVSS 5.9 EPSS 0.39%

   Impact: Undici's cache interceptor incorrectly classifies some responses as cacheable when the upstream Cache-Control header uses whitespace-padded qualified private or no-cache field names such as private=" authorization" or no-cache="\tauthorization". The parser preserves the s...

3. CVE-2026-9679 undici vulnerable to HTTP header injection via Set-Cookie percent-decoding

   Published 2026-06-17

   Medium·CVSS 5.9 EPSS 0.26%

   Impact: undici's cookie parser in parseSetCookie percent-decodes cookie values via qsUnescape, turning encoded sequences like %0D%0A, %00, %3B, and %3D into their literal byte equivalents. RFC 6265 §5.4 does not specify any decoding and browsers do not decode either. Applications...

4. CVE-2026-9697 undici vulnerable to TLS certificate validation bypass via dropped requestTls in SOCKS5 ProxyAgent

   Published 2026-06-17

   High·CVSS 7.4 EPSS 0.46%

   Impact: undici's ProxyAgent silently drops the requestTls option when configured with a SOCKS5 proxy URI (socks5:// or socks://). The target HTTPS connection through the SOCKS5 tunnel falls back to Node's default trust store, ignoring user-configured ca, cert, key, rejectUnauthor...

5. CVE-2026-6734 undici vulnerable to cross-origin request routing via SOCKS5 proxy pool reuse

   Published 2026-06-17

   High·CVSS 8.8 EPSS 0.35%

   Impact: When using Socks5ProxyAgent, undici reuses a single connection pool across different origins without verifying that the pool's origin matches the requested origin. All requests are dispatched through the pool connected to the first origin, regardless of the intended desti...

6. CVE-2026-9675 undici WebSocket client vulnerable to denial of service via cumulative fragment bypass

   Published 2026-06-17

   High·CVSS 7.5 EPSS 0.43%

   Impact: The undici WebSocket client enforces maxPayloadSize per-frame but does not enforce the cumulative size of fragmented uncompressed messages. A malicious WebSocket server can stream many small fragments that each pass per-frame validation but collectively exceed the configu...

7. CVE-2026-12151 undici WebSocket client vulnerable to denial of service via fragment count bypass

   Published 2026-06-17

   High·CVSS 7.5 EPSS 0.79%

   Impact: The undici WebSocket client enforces maxPayloadSize on the cumulative byte count of fragments in a message but does not enforce a limit on the number of fragments. A malicious WebSocket server can stream many small or empty continuation frames that each pass per-frame and...

8. CVE-2026-21717 A flaw in V8's string hashing mechanism causes integer-like strings to be hashed to their numeric value, making hash collisions trivially predictable. By crafting a request that causes many such colli...

   Published 2026-03-30

   Medium·CVSS 5.9 EPSS 0.27%

   A flaw in V8's string hashing mechanism causes integer-like strings to be hashed to their numeric value, making hash collisions trivially predictable. By crafting a request that causes many such collisions in V8's internal string table, an attacker can significantly degrade perfo...

9. CVE-2026-21716 An incomplete fix for CVE-2024-36137 leaves `FileHandle.chmod()` and `FileHandle.chown()` in the promises API without the required permission checks, while their callback-based equivalents (`fs.fchmod...

   Published 2026-03-30

   Low·CVSS 3.3 EPSS 0.14%

   An incomplete fix for CVE-2024-36137 leaves FileHandle.chmod() and FileHandle.chown() in the promises API without the required permission checks, while their callback-based equivalents (fs.fchmod(), fs.fchown()) were correctly patched. As a result, code running under --permission...

10. CVE-2026-21715 A flaw in Node.js Permission Model filesystem enforcement leaves `fs.realpathSync.native()` without the required read permission checks, while all comparable filesystem functions correctly enforce the...

    Published 2026-03-30

    Low·CVSS 3.3 EPSS 0.15%

    A flaw in Node.js Permission Model filesystem enforcement leaves fs.realpathSync.native() without the required read permission checks, while all comparable filesystem functions correctly enforce them. As a result, code running under --permission with restricted --allow-fs-read ca...

11. CVE-2026-21714 A memory leak occurs in Node.js HTTP/2 servers when a client sends WINDOW_UPDATE frames on stream 0 (connection-level) that cause the flow control window to exceed the maximum value of 2³¹-1. The serv...

    Published 2026-03-30

    Medium·CVSS 5.3 EPSS 0.43%

    A memory leak occurs in Node.js HTTP/2 servers when a client sends WINDOW_UPDATE frames on stream 0 (connection-level) that cause the flow control window to exceed the maximum value of 2³¹-1. The server correctly sends a GOAWAY frame, but the Http2Session object is never cleaned...

12. CVE-2026-21713 A flaw in Node.js HMAC verification uses a non-constant-time comparison when validating user-provided signatures, potentially leaking timing information proportional to the number of matching bytes. U...

    Published 2026-03-30

    Medium·CVSS 5.9 EPSS 0.37%

    A flaw in Node.js HMAC verification uses a non-constant-time comparison when validating user-provided signatures, potentially leaking timing information proportional to the number of matching bytes. Under certain threat models where high-resolution timing measurements are possibl...

13. CVE-2026-21711 A flaw in Node.js Permission Model network enforcement leaves Unix Domain Socket (UDS) server operations without the required permission checks, while all comparable network paths correctly enforce th...

    Published 2026-03-30

    Medium·CVSS 5.3 EPSS 0.17%

    A flaw in Node.js Permission Model network enforcement leaves Unix Domain Socket (UDS) server operations without the required permission checks, while all comparable network paths correctly enforce them. As a result, code running under --permission without --allow-net can create...

14. CVE-2026-21710 A flaw in Node.js HTTP request handling causes an uncaught `TypeError` when a request is received with a header named `__proto__` and the application accesses `req.headersDistinct`. When this occurs,...

    Published 2026-03-30

    High·CVSS 7.5 EPSS 25.4%

    A flaw in Node.js HTTP request handling causes an uncaught TypeError when a request is received with a header named __proto__ and the application accesses req.headersDistinct. When this occurs, dest["__proto__"] resolves to Object.prototype rather than undefined, causing .push()...

15. CVE-2026-21712 A flaw in Node.js URL processing causes an assertion failure in native code when `url.format()` is called with a malformed internationalized domain name (IDN) containing invalid characters, crashing t...

    Published 2026-03-30

    Medium·CVSS 6.5 EPSS 0.33%

    A flaw in Node.js URL processing causes an assertion failure in native code when url.format() is called with a malformed internationalized domain name (IDN) containing invalid characters, crashing the Node.js process.

16. CVE-2026-2229 undici is vulnerable to Unhandled Exception in undici WebSocket Client Due to Invalid server_max_window_bits Validation

    Published 2026-03-12

    High·CVSS 7.5 EPSS 1.0%

    ImpactThe undici WebSocket client is vulnerable to a denial-of-service attack due to improper validation of the server_max_window_bits parameter in the permessage-deflate extension. When a WebSocket client connects to a server, it automatically advertises support for permessage-d...

17. CVE-2026-1528 undici is vulnerable to Malicious WebSocket 64-bit length overflows undici parser and crashes the client

    Published 2026-03-12

    High·CVSS 7.5 EPSS 0.56%

    ImpactA server can reply with a WebSocket frame using the 64-bit length form and an extremely large length. undici's ByteParser overflows internal math, ends up in an invalid state, and throws a fatal TypeError that terminates the process. Patches Patched in the undici version v7...

18. CVE-2026-1527 undici is vulnerable to CRLF Injection via upgrade option

    Published 2026-03-12

    Medium·CVSS 4.6 EPSS 0.32%

    ImpactWhen an application passes user-controlled input to the upgrade option of client.request(), an attacker can inject CRLF sequences (\r\n) to: Inject arbitrary HTTP headers Terminate the HTTP request prematurely and smuggle raw data to non-HTTP services (Redis, Memcached, Ela...

19. CVE-2026-2581 undici is vulnerable to Unbounded Memory Consumption in in Undici's DeduplicationHandler via Response Buffering leads to DoS

    Published 2026-03-12

    Medium·CVSS 5.9 EPSS 0.63%

    This is an uncontrolled resource consumption vulnerability (CWE-400) that can lead to Denial of Service (DoS). In vulnerable Undici versions, when interceptors.deduplicate() is enabled, response data for deduplicated requests could be accumulated in memory for downstream handlers...

20. CVE-2026-1526 undici is vulnerable to Unbounded Memory Consumption in undici WebSocket permessage-deflate Decompression

    Published 2026-03-12

    High·CVSS 7.5 EPSS 1.3%

    The undici WebSocket client is vulnerable to a denial-of-service attack via unbounded memory consumption during permessage-deflate decompression. When a WebSocket connection negotiates the permessage-deflate extension, the client decompresses incoming compressed frames without en...

21. CVE-2026-1525 undici is vulnerable to Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

    Published 2026-03-12

    Critical·CVSS 9.8 EPSS 0.56%

    Undici allows duplicate HTTP Content-Length headers when they are provided in an array with case-variant names (e.g., Content-Length and content-length). This produces malformed HTTP/1.1 requests with multiple conflicting Content-Length values on the wire. Who is impacted: Applic...

22. CVE-2025-59466 nodejs: Nodejs denial of service

    Published 2026-01-20

    High·CVSS 7.5 EPSS 0.68%

    We have identified a bug in Node.js error handling where "Maximum call stack size exceeded" errors become uncatchable when async_hooks.createHook() is enabled. Instead of reaching process.on('uncaughtException'), the process terminates, making the crash unrecoverable. Application...

23. CVE-2025-59465 nodejs: Nodejs denial of service

    Published 2026-01-20

    High·CVSS 7.5 EPSS 4.0%

    A malformed HTTP/2 HEADERS frame with oversized, invalid HPACK data can cause Node.js to crash by triggering an unhandled TLSSocket error ECONNRESET. Instead of safely closing the connection, the process crashes, enabling a remote denial of service. This primarily affects applica...

24. CVE-2025-59464 nodejs: Nodejs memory leak

    Published 2026-01-20

    High·CVSS 7.5 EPSS 0.27%

    A memory leak in Node.js’s OpenSSL integration occurs when converting X.509 certificate fields to UTF-8 without freeing the allocated buffer. When applications call socket.getPeerCertificate(true), each certificate field leaks memory, allowing remote clients to trigger steady mem...

25. CVE-2025-55132 nodejs: Nodejs filesystem permissions bypass

    Published 2026-01-20

    Medium·CVSS 5.3 EPSS 0.26%

    A flaw in Node.js's permission model allows a file's access and modification timestamps to be changed via futimes() even when the process has only read permissions. Unlike utimes(), futimes() does not apply the expected write-permission checks, which means file metadata can be mo...

Sources: CVE.org, NVD, CISA KEV, FIRST EPSS, OSV and public exploit-reference metadata. Product matching comes from the published CVE records. A proof-of-concept means public code exists; it is not evidence of exploitation.