CVE catalog

CVE-2026-109924

node-undici: CVE-2026-109924

[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 6.5.0 through 6.29.0, 7.0.0 through 7.30.0, and 8.0.0 through 8.12.1, its EventSource client can be driven to exhaust process memory by a malicious or compromised Server-Sent Events peer. By sending millions of tiny completed data fields with no blank event separator, or a single unfinished line split across many chunks, the parser retains a growing amount of per-field and per-chunk state that the byte-based maxEventSize and maxResponseSize limits do not bound, and because maxResponseSize is enforced on the compressed body before decompression, a small compressed response can expand into enough retained memory to terminate the process. An application only needs to maintain an EventSource connection to an untrusted peer, which controls only the response, and availability is the only impact. The issue is fixed in undici 6.29.1, 7.30.1, and 8.12.2, which bound the retained parser state independently of the byte limits, 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-2026-109924Not 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]