CVE catalog

CVE-2026-109932

node-undici: CVE-2026-109932

[CVE catalog]

Severity
Medium · CVSS 5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
Source
[NVD] · [CVE record]
EPSS
0.32% · Oct 25, 2026

undici is an HTTP client library for Node.js. In versions 5.15.0 through 6.29.0, 7.0.0 through 7.30.0, and 8.0.0 through 8.12.1, its WebSocket client, including the bundled WebSocket exposed by Node.js, can be driven to exhaust process memory by a malicious or compromised WebSocket server. For every PING frame received, the client automatically writes a PONG response and ignores the backpressure signal from the socket write, 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, since small inbound PINGs produce a much larger retained outbound queue, with availability the only impact. The issue is fixed in undici 6.29.1, 7.30.1, and 8.12.2, which pause WebSocket frame parsing when the automatic PONG response hits socket backpressure and resume on drain, bounding the outbound queue, and users should upgrade to one of those versions or later. There is no workaround.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

DistributionPackageReleaseVersionStatus
Debiannode-undicisid8.12.2+dfsg+~cs3.2.3-2fixed
Debiannode-undiciforky8.10.2+dfsg+~cs3.2.2-1vulnerable
Debiannode-undicitrixie7.3.0+dfsg1+~cs24.12.11-1vulnerable
Debiannode-undicibookworm5.15.0+dfsg1+~cs20.10.9.3-1+deb12u4vulnerable
Debiannode-undicibookworm-security5.15.0+dfsg1+~cs20.10.9.3-1+deb12u3vulnerable
CpeundiciNot reported8.12.2fixed
Ubuntunode-undici24.045.22.1+dfsg1+~cs20.10.10.2-1ubuntu1vulnerable
Ubuntunode-undici24.045.26.3+dfsg1+~cs23.10.12-2vulnerable
Ubuntunode-undici26.107.18.2+dfsg+~cs3.2.0-1build1vulnerable
Ubuntunode-undici26.107.24.6+dfsg+~cs3.2.0-3vulnerable
Ubuntunode-undici26.108.5.0+dfsg+~cs3.2.0-2vulnerable
Ubuntunode-undici26.108.5.0+dfsg+~cs3.2.0-3vulnerable
Ubuntunode-undici26.108.9.0+dfsg+~cs3.2.0-1vulnerable
Ubuntunode-undici26.047.3.0+dfsg1+~cs24.12.11-2vulnerable
Ubuntunode-undici26.047.16.0+dfsg+~cs3.2.0-2vulnerable
Ubuntunode-undici26.047.18.2+dfsg+~cs3.2.0-1vulnerable
Ubuntunode-undici26.047.18.2+dfsg+~cs3.2.0-1build1vulnerable

Fixed-version evidence

DistributionPackageTypeReleaseFixed versionUrgencyOriginBugs
Debiannode-undicisourcesid8.12.2+dfsg+~cs3.2.3-1not yet assignedNot reportedNot reported
Debiannode-undicisourceforky(unfixed)not yet assignedNot reportedNot reported
Debiannode-undicisourcetrixie(unfixed)not yet assignedNot reportedNot reported
Debiannode-undicisourcebookworm(unfixed)not yet assignedNot reportedNot reported
CpeundicicpeNot reported8.12.2Not reportedNVD-CVE-2026-109932Not reported

Notes

[trixie] node-undici: Minor issue

OpenFactory catalog packages

[Debian 12 (Bookworm)]

  • [node-llhttp]Affected

    Source package: [node-undici]

    Details (4)

    • 8.1.0~5.15.0+dfsg1+~cs20.10.9.3-1+deb12u4 · all · bookworm

      Affected

      dsa · node-undici · debian · bookworm; dsa · node-undici · debian · 12

    • 8.1.0~5.15.0+dfsg1+~cs20.10.9.3-1+deb12u4 · all · bookworm

      Affected

      dsa · node-undici · debian · bookworm; dsa · node-undici · debian · 12

    • 8.1.0~5.15.0+dfsg1+~cs20.10.9.3-1+deb12u3 · all · bookworm-security

      Affected

      dsa · node-undici · debian · bookworm; dsa · node-undici · debian · 12

    • 8.1.0~5.15.0+dfsg1+~cs20.10.9.3-1+deb12u3 · all · bookworm-security

      Affected

      dsa · node-undici · debian · bookworm; dsa · node-undici · debian · 12

  • [node-undici]Affected
    Details (4)

    • 5.15.0+dfsg1+~cs20.10.9.3-1+deb12u4 · all · bookworm

      Affected

      dsa · node-undici · debian · bookworm; dsa · node-undici · debian · 12

    • 5.15.0+dfsg1+~cs20.10.9.3-1+deb12u4 · all · bookworm

      Affected

      dsa · node-undici · debian · bookworm; dsa · node-undici · debian · 12

    • 5.15.0+dfsg1+~cs20.10.9.3-1+deb12u3 · all · bookworm-security

      Affected

      dsa · node-undici · debian · bookworm; dsa · node-undici · debian · 12

    • 5.15.0+dfsg1+~cs20.10.9.3-1+deb12u3 · all · bookworm-security

      Affected

      dsa · node-undici · debian · bookworm; dsa · node-undici · debian · 12

[Debian 13 (Trixie)]

  • [libllhttp9.2]Affected

    Source package: [node-undici]

    Details (2)

    • 9.2.1~7.3.0+dfsg1+~cs24.12.11-1 · amd64 · trixie

      Affected

      dsa · node-undici · debian · 13

    • 9.2.1~7.3.0+dfsg1+~cs24.12.11-1 · arm64 · trixie

      Affected

      dsa · node-undici · debian · 13

  • [libllhttp-dev]Affected

    Source package: [node-undici]

    Details (2)

    • 9.2.1~7.3.0+dfsg1+~cs24.12.11-1 · amd64 · trixie

      Affected

      dsa · node-undici · debian · 13

    • 9.2.1~7.3.0+dfsg1+~cs24.12.11-1 · arm64 · trixie

      Affected

      dsa · node-undici · debian · 13

  • [node-llhttp]Affected

    Source package: [node-undici]

    Details (2)

    • 9.2.1~7.3.0+dfsg1+~cs24.12.11-1 · all · trixie

      Affected

      dsa · node-undici · debian · 13

    • 9.2.1~7.3.0+dfsg1+~cs24.12.11-1 · all · trixie

      Affected

      dsa · node-undici · debian · 13

  • [node-undici]Affected
    Details (2)

    • 7.3.0+dfsg1+~cs24.12.11-1 · all · trixie

      Affected

      dsa · node-undici · debian · 13

    • 7.3.0+dfsg1+~cs24.12.11-1 · all · trixie

      Affected

      dsa · node-undici · debian · 13

Observed:

References

[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]