build(deps): bump undici from 6.26.0 to 6.27.0 by dependabot[bot] · Pull Request #10129 · firebase/firebase-js-sdk · GitHub
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Bumps undici from 6.26.0 to 6.27.0.
Release notesSourced from undici's releases.
v6.27.0
⚠️ Security Release
This release line addresses 4 security advisories.
Action required: Upgrade to undici 6.27.0 or later.
Note on patched version: the v6 fixes shipped in v6.27.0, not 6.26.0 — v6.26.0 contains only the chunked-EOF fix (#5308) and the version bump, none of the security fixes below.
The v6 line is not affected by the SOCKS5 advisories (GHSA-vmh5-mc38-953g, GHSA-hm92-r4w5-c3mj), the shared-cache disclosure (GHSA-pr7r-676h-xcf6), or the 8.x-only WebSocket regression (GHSA-38rv-x7px-6hhq).
Summary
High severity
WebSocket DoS via fragment count bypass — CVE-2026-12151
GHSA-vxpw-j846-p89q · CWE-400, CWE-770 Fix: b7f252e7 Backport WebSocket maxPayloadSize fixes (#5423, backported to v6 in #5428)
A malicious WebSocket server can stream a large number of small or empty continuation frames. Undici enforced a limit on cumulative payload size but did not limit the number of fragments per message, leading to unbounded memory growth and denial of service. All releases from 6.17.0 onward are affected.
Moderate severity
HTTP header injection via Set-Cookie percent-decoding — CVE-2026-9679
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