79:T246f,Bumps [undici](https://github.com/nodejs/undici) from 8.11.2 to 8.12.3.

Release notes

v8.12.3

What's Changed

ci: use Python 3.14 for the WPT server on macOS by @mrityunjay-pandey in nodejs/undici#6029

build(deps-dev): bump neostandard from 0.13.0 to 0.14.0 by @dependabot[bot] in nodejs/undici#6006

build(deps-dev): bump eslint from 9.39.4 to 10.12.0 by @dependabot[bot] in nodejs/undici#5967

docs: document the options of interceptors.cache() by @qodelicious in nodejs/undici#6050

fix(h2): replace a connection that stops responding after a stream timeout by @mcollina in nodejs/undici#6052

fix(pool): keep caller async context for queued requests by @mcollina in nodejs/undici#5982

New Contributors

@qodelicious made their first contribution in nodejs/undici#6050

Full Changelog: https://github.com/nodejs/undici/compare/v8.12.2...v8.12.3

v8.12.2

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 Agent options

CVE-2026-109383 · GHSA-2m5v-pch6-74hx

Agent used a JSON-based clone for constructor options, which silently removed function-valued TLS options such as checkServerIdentity. 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 Agent combined redirect and shared-cache interceptors as compose(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-Encoding values

CVE-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 decompress interceptor

CVE-2026-87029 · GHSA-55wc-3pg8-jfw6

... (truncated)

Commits

ff9cc5e Bumped v8.12.3 (#6053)
0bbf614 fix(pool): keep caller async context for queued requests (#5982)
aa1eef1 fix(h2): replace a connection that stops responding after a stream timeout (#...
e34b872 docs: document the options of interceptors.cache() (#6050)
e8f3423 build(deps-dev): bump eslint from 9.39.4 to 10.12.0 (#5967)
b777e40 build(deps-dev): bump neostandard from 0.13.0 to 0.14.0 (#6006)
43700ff ci: use Python 3.14 for the WPT server on macOS (#6029)
bb6cc0a Bumped v8.12.2 (#6021)
b217373 fix(websocket): bound automatic PONG writes under backpressure
789ef26 fix(eventsource): bound retained SSE parser state
Additional commits viewable in compare view

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v8.12.3

What's Changed

New Contributors

v8.12.2

Security fixes

High severity

Denial of service via TLS 1.2 certificate-changing renegotiation

TLS certificate validation bypass through dropped `Agent` options

Cache poisoning and cross-user disclosure through cross-origin redirects

Denial of service through excessive `Content-Encoding` values

Medium severity

Denial of service through the `decompress` interceptor

Commits on Fri, Oct 30, 2026