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npm package

undici 8.10.0 vulnerabilities, and the version that fixes all of them

undici 8.10.0 has 11 known vulnerabilities (3 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
11
3 rated high or critical
Released
Aug 3, 2026
Latest is 8.12.2
Downloads last week
4.8M
2% 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 11 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 8.10.0

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. 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.

  2. WarningCVE-2026-85024 on OSV.dev (opens in a new tab)GHSA-3wwx-pv8p-q78vEPSS: top 67%

    undici vulnerable to Denial of Service via unhandled error in WebSocket permessage-deflate decompression

    Fixed in 8.10.2. Published Sep 28, 2026.

  3. 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.

  4. 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.

  5. 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.

  6. 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.

  7. 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.

  8. 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.

  9. CriticalCVE-2026-85152 on OSV.dev (opens in a new tab)GHSA-vp8m-p9jh-q5pmEPSS: top 95%

    undici vulnerable to cross-origin cache poisoning via missing origin isolation in interceptors

    Fixed in 8.10.2. Published Sep 29, 2026.

  10. 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.

  11. 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 8.10.0, 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.