StackPrism

npm package

undici 8.0.0 vulnerabilities, and the version that fixes all of them

undici 8.0.0 has 22 known vulnerabilities (7 rated high or critical); 8.10.2 fixes all of them.

npm (opens in a new tab) describes it as “An HTTP/1.1 client, written from scratch for Node.js”

Known vulnerabilities
22
7 rated high or critical
Released
Apr 2, 2026
Latest is 8.12.2
Downloads last week
3.1K
Under 1% of undici downloads
Licence
MIT
OpenSSF Scorecard
8.1/10
nodejs/undici (opens in a new tab)
Dependencies
None
Resolved by deps.dev

What to upgrade to

8.10.2 is the closest release with no known vulnerabilities.

  • 8.10.2Upgrade to this

    Fixes all 22 known vulnerabilities. Released Sep 4, 2026.

    No known vulnerabilities

  • 8.12.2

    Newest 8.x release and the latest release. Released Oct 15, 2026.

    No known vulnerabilities

8.10.2 came out on Sep 4, 2026. A coding agent trained before then doesn’t know it exists, so it may suggest an older release. AI knowledge cutoff dates

Hand the fix to your coding agent

One task with the upgrade, the file to change and why. Paste it into Claude Code, Cursor or Codex.

Findings

Every advisory for undici 8.0.0

Known exploited first (CISA KEV), then by how likely they are to be exploited (FIRST EPSS), then by severity. Each id links to its OSV.dev record.

  1. CriticalCVE-2026-12151 on OSV.dev (opens in a new tab)GHSA-vxpw-j846-p89qEPSS: top 45%

    undici WebSocket client vulnerable to denial of service via fragment count bypass

    Fixed in 8.5.0. Published Jun 19, 2026.

  2. CriticalCVE-2026-13697 on OSV.dev (opens in a new tab)GHSA-4cwx-7wf7-3272EPSS: top 55%

    undici vulnerable to cross-user information disclosure and parse-time crash via degenerate private cache directives

    Fixed in 8.9.0. Published Aug 3, 2026.

  3. CriticalCVE-2026-9697 on OSV.dev (opens in a new tab)GHSA-vmh5-mc38-953gEPSS: top 55%

    undici vulnerable to TLS certificate validation bypass via dropped requestTls in SOCKS5 ProxyAgent

    Fixed in 8.5.0. Published Jun 18, 2026.

  4. CriticalCVE-2026-9675 on OSV.dev (opens in a new tab)GHSA-38rv-x7px-6hhqEPSS: top 60%

    undici WebSocket client vulnerable to denial of service via cumulative fragment bypass

    Fixed in 8.5.0. Published Jun 18, 2026.

  5. WarningCVE-2026-9678 on OSV.dev (opens in a new tab)GHSA-pr7r-676h-xcf6EPSS: top 66%

    undici vulnerable to cross-user information disclosure via shared cache whitespace bypass

    Fixed in 8.5.0. Published Jun 18, 2026.

  6. WarningCVE-2026-84890 on OSV.dev (opens in a new tab)GHSA-3xpg-4rpp-hhhmEPSS: top 67%

    undici vulnerable to Denial of Service via unbounded decompression of compressed responses

    Fixed in 8.10.2. Published Sep 29, 2026.

  7. WarningCVE-2026-14643 on OSV.dev (opens in a new tab)GHSA-jr45-8vmc-qm54EPSS: top 68%

    undici vulnerable to cross-user information disclosure via whitespace around equals in Cache-Control directives

    Fixed in 8.9.0. Published Aug 3, 2026.

  8. CriticalCVE-2026-19534 on OSV.dev (opens in a new tab)GHSA-rfgv-xxqx-mfg5EPSS: top 69%

    undici vulnerable to Denial of Service via unrequested WebSocket subprotocol

    Fixed in 8.10.2. Published Sep 29, 2026.

  9. CriticalCVE-2026-6734 on OSV.dev (opens in a new tab)GHSA-hm92-r4w5-c3mjEPSS: top 69%

    undici vulnerable to cross-origin request routing via SOCKS5 proxy pool reuse

    Fixed in 8.2.0. Published Jun 19, 2026.

  10. WarningCVE-2026-85014 on OSV.dev (opens in a new tab)GHSA-rx4f-c7p8-82vqEPSS: top 71%

    undici vulnerable to Denial of Service via WebSocketStream unclean close

    Fixed in 8.10.2. Published Sep 29, 2026.

  11. WarningCVE-2026-18149 on OSV.dev (opens in a new tab)GHSA-pmjh-fq2x-6v4xEPSS: top 72%

    undici vulnerable to Denial of Service via orphaned RetryHandler response body

    Fixed in 8.10.2. Published Sep 29, 2026.

  12. WarningCVE-2026-9679 on OSV.dev (opens in a new tab)GHSA-p88m-4jfj-68fvEPSS: top 76%

    undici vulnerable to HTTP header injection via Set-Cookie percent-decoding

    Fixed in 8.5.0. Published Jun 19, 2026.

  13. WarningCVE-2026-84933 on OSV.dev (opens in a new tab)GHSA-2jfj-6hjv-fm6jEPSS: top 79%

    undici vulnerable to cross-user cookie disclosure via Set-Cookie caching in shared caches

    Fixed in 8.10.2. Published Sep 29, 2026.

  14. LowCVE-2026-6733 on OSV.dev (opens in a new tab)GHSA-35p6-xmwp-9g52EPSS: top 83%

    undici vulnerable to HTTP response queue poisoning via keep-alive socket reuse

    Fixed in 8.5.0. Published Jun 19, 2026.

  15. LowCVE-2026-18540 on OSV.dev (opens in a new tab)GHSA-r53p-7pc4-xj5rEPSS: top 87%

    undici vulnerable to downstream response splitting via retry interceptor

    Fixed in 8.10.2. Published Sep 29, 2026.

  16. LowCVE-2026-11525 on OSV.dev (opens in a new tab)GHSA-g8m3-5g58-fq7mEPSS: top 87%

    undici vulnerable to Set-Cookie SameSite attribute downgrade via permissive substring matching

    Fixed in 8.5.0. Published Jun 19, 2026.

  17. LowCVE-2026-84947 on OSV.dev (opens in a new tab)GHSA-2gqq-gqf2-x968EPSS: top 92%

    undici vulnerable to response truncation via oversized chunked responses in the dump interceptor

    Fixed in 8.10.2. Published Sep 29, 2026.

  18. WarningCVE-2026-15157 on OSV.dev (opens in a new tab)GHSA-m8rv-5g2x-5cg5EPSS: top 92%

    undici vulnerable to CRLF Injection via blob-like body 'type' property

    Fixed in 8.9.0. Published Aug 3, 2026.

  19. WarningCVE-2026-16729 on OSV.dev (opens in a new tab)GHSA-v3r7-h72x-cjcmEPSS: top 92%

    undici vulnerable to cookie attribute injection via unsanitized domain and unparsed setCookie fields

    Fixed in 8.9.0. Published Aug 3, 2026.

  20. WarningCVE-2026-16728 on OSV.dev (opens in a new tab)GHSA-8xcm-r25x-g524EPSS: top 94%

    undici vulnerable to downstream response desynchronization via retry interceptor

    Fixed in 8.9.0. Published Aug 3, 2026.

  21. CriticalCVE-2026-84961 on OSV.dev (opens in a new tab)GHSA-w293-vg96-wgc3EPSS: top 97%

    undici vulnerable to TLS certificate validation bypass via dropped connect options in BalancedPool

    Fixed in 8.10.2. Published Sep 29, 2026.

  22. LowCVE-2026-85008 on OSV.dev (opens in a new tab)GHSA-8436-99hf-9mmvEPSS: top 99%

    undici vulnerable to caching and replay of unsafe HTTP method responses

    Fixed in 8.10.2. Published Sep 29, 2026.

Who is still on a vulnerable undici

51% of last week’s 217.5M undici downloads went to versions with known vulnerabilities.

From npm’s per-version download counts for the last 7 days, each version checked against OSV.dev. The versions checked cover over 99% of downloads.

Is undici the only one?

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How this page is checked

StackPrism asks OSV.dev which advisories affect exactly undici 8.0.0, merges duplicates filed under several ids, and ranks them with CISA’s Known Exploited Vulnerabilities list and FIRST EPSS. Release dates and deprecation come from deps.dev and npm. No AI writes this page: every sentence comes from that data, refreshed every few hours.

Last checked against npm, OSV.dev, deps.dev, CISA KEV and FIRST EPSS.