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chore(deps): update dependency undici to v7.30.1 [security] - #848
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This PR contains the following updates:
7.29.1→7.30.1undici vulnerable to Denial of Service via unhandled error on excessive content-encodings
CVE-2026-109869 / GHSA-xjj6-f33q-929c
More information
Details
Impact
undici's
fetch()crashes the Node.js process when a malicious server returns a response with more than five content codings and closes the connection before sending the body. undici rejects such responses (a content-encoding limit), but it created the internal response stream before that check and returned without attaching an error listener or aborting the request. The early close then surfaces a content-length mismatch on that orphaned internal stream, which Node.js treats as an unhandlederrorand terminates the process. A remote, unauthenticated server can trigger this with a single response, even when the application correctly catches thefetch()rejection. undici 6.x, 7.x, and 8.x are affected.Patches
Upgrade to
6.29.1,7.30.1, or8.12.2. undici now validates the content-encoding chain before creating the internal body stream and aborts the response when the limit is exceeded, so no error can surface on an orphaned stream.Workarounds
None.
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HReferences
This data is provided by the GitHub Advisory Database (CC-BY 4.0).
undici WebSocket client vulnerable to Denial of Service via unbounded automatic PONG buffering
CVE-2026-109932 / GHSA-9fm3-97px-rjf6
More information
Details
Impact
undici's WebSocket client (including Node.js's bundled
globalThis.WebSocket) can be driven to exhaust process memory by a malicious or compromised WebSocket server. For every PING frame received, the receiver automatically writes a PONG response to the socket and ignores thefalsereturn value fromsocket.write(), which is a backpressure signal, so a server that streams small PING frames while never reading the client's PONGs makes the outbound write queue and heap grow without bound until the Node.js process runs out of memory and terminates. The attack is remote and unauthenticated, needs only a normal WebSocket connection, and is asymmetric: small inbound PINGs produce a much larger retained outbound queue. Availability is the only impact. undici 5.x, 6.x, 7.x, and 8.x are affected; the WebSocket client was introduced in 5.15.0.Patches
Upgrade to
6.29.1,7.30.1, or8.12.2, which pause WebSocket frame parsing when the automatic PONG response hits socket backpressure and resume on drain, bounding the outbound queue.Workarounds
None.
Severity
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:HReferences
This data is provided by the GitHub Advisory Database (CC-BY 4.0).
undici vulnerable to TLS certificate validation bypass via dropped tls options in Agent
CVE-2026-109383 / GHSA-2m5v-pch6-74hx
More information
Details
Impact
undici's
Agentpasses its constructor options through a JSON-based deep clone (JSON.parse(JSON.stringify(...))) before forwarding them to each per-originPool. JSON cannot represent functions, so a caller-suppliedtlsoption containing acheckServerIdentitycallback is silently dropped before it reaches the TLS layer. As a result, a TLS peer whose certificate a customcheckServerIdentitywas written to reject, but which passes Node's default hostname and chain checks, is silently accepted when the request is made throughAgent. BecauseAgentis the default dispatcher behindrequest,fetch, andsetGlobalDispatcher, this is the path most applications use.EnvHttpProxyAgentis also affected on its direct andNO_PROXYroutes, which delegate to an internalAgent.Only applications that pass a function-valued
tlsoption (such as a customcheckServerIdentityfor certificate or public-key pinning) are affected. Passing the same options throughconnectis not affected. This is theAgentcounterpart of theBalancedPoolcertificate validation bypass fixed in CVE-2026-84961.Patches
Upgrade to undici
6.29.1,7.30.1, or8.12.2.Agentnow preserves thetlsoption outside the JSON clone, so custom TLS verification callbacks are forwarded to each origin unchanged.Workarounds
Pass the TLS options through
connectinstead oftls. For proxiedEnvHttpProxyAgentdestinations, userequestTls/proxyTls.Severity
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:NReferences
This data is provided by the GitHub Advisory Database (CC-BY 4.0).
Release Notes
nodejs/undici (undici)
v7.30.1Compare Source
Security fixes
High severity
Denial of service via TLS 1.2 certificate-changing renegotiation
CVE-2026-87018 · GHSA-qrxm-fqhp-jwvm
A malicious or compromised HTTPS server could crash the Node.js process by initiating TLS 1.2 renegotiation and presenting a different, CA-trusted certificate whose hostname did not match the requested host. The resulting socket error reached an assertion in undici's HTTP/1.1 and HTTP/2 connection handling. This release handles post-connect certificate errors without terminating the process.
TLS certificate validation bypass through dropped
AgentoptionsCVE-2026-109383 · GHSA-2m5v-pch6-74hx
Agentused a JSON-based clone for constructor options, which silently removed function-valued TLS options such ascheckServerIdentity. Applications relying on custom certificate or public-key verification could therefore accept a certificate that the callback was intended to reject. This release preserves TLS options when creating per-origin dispatchers.Cache poisoning and cross-user disclosure through cross-origin redirects
CVE-2026-109829 · GHSA-4w7w-5xrc-9h26
When an originless
Agentcombined redirect and shared-cache interceptors ascompose(redirect(), cache()), a response from a cross-origin redirect could be stored under the original URL. This could allow persistent cache poisoning or disclosure of user-specific responses to later callers. This release verifies the response origin before caching and preserves redirect-hop cache-control policy.Denial of service through excessive
Content-EncodingvaluesCVE-2026-109869 · GHSA-xjj6-f33q-929c
A malicious HTTP server could crash the Node.js process by returning more than five content codings and closing the connection before sending the body. Although
fetch()rejected the response, an error from an orphaned internal stream could remain unhandled. This release validates the content-encoding chain before creating the body stream and aborts oversized chains safely.Medium severity
Denial of service through the
decompressinterceptorCVE-2026-87029 · GHSA-55wc-3pg8-jfw6
An exception thrown by a downstream response handler from an asynchronous decompression callback could escape as an uncaught exception. A server could trigger this when
decompresswas composed with a handler such asdumpwith a size limit. This release converts downstream handler exceptions into per-request errors.Subresource Integrity bypass with non-lowercase algorithm tokens
CVE-2026-109841 · GHSA-f72v-6w45-q472
fetch()treated valid mixed-case or uppercase SRI algorithm tokens, such asSHA256, as unknown and could accept a response whose body did not match the configured digest. This release normalizes algorithm tokens before validation and digest selection.Denial of service through unbounded EventSource parser state
CVE-2026-109924 · GHSA-4qv8-2p9j-2685
A malicious Server-Sent Events endpoint could exhaust process memory by sending many tiny
data:fields without completing an event, or by splitting an unfinished line across many chunks. This release bounds retained EventSource parser state, including field counts, buffered chunks, unfinished-line length, and retained field data.Denial of service through unbounded automatic WebSocket PONG buffering
CVE-2026-109932 · GHSA-9fm3-97px-rjf6
A malicious WebSocket server could exhaust process memory by flooding the client with PING frames while not reading the automatic PONG responses. undici previously ignored socket backpressure and allowed the outbound queue to grow without bound. This release pauses frame parsing when PONG writes encounter backpressure and resumes after the socket drains.
What's Changed
New Contributors
Full Changelog: nodejs/undici@v7.30.0...v7.30.1
v7.30.0Compare Source
What's Changed
Full Changelog: nodejs/undici@v7.29.1...v7.30.0
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