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CVE record · CVE-2026-109821

Unbounded port parsing in URI.parse/1 enables CPU exhaustion denial of service in Elixir

CVSS 6.3 MediumEPSS 0.0050 · 42nd percentile

Published by the CVE Program (CNA: EEF) at 30 Oct 2026, 08:54 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
VendorProductVersions
elixir-lang elixir Package name: elixir pkg:otp/elixir?repository_url=https:%2F%2Fgithub.com%2Felixir-lang%2Felixir&vcs_url=git%2Bhttps:%2F%2Fgithub.com%2Felixir-lang%2Felixir.git
  • affected 0.5.0 to before 1.18.6 semver
  • affected 1.19.0-rc.0 to before 1.19.7 semver
  • affected 1.20.0-rc.0 to before 1.20.5 semver
Other versions: unaffected
elixir-lang elixir Package name: elixir-lang/elixir https://github.com pkg:github/elixir-lang/elixir
  • affected 39801821eef2d06524e5ebf5a0e4b3c380ad23ae to before * git
Other versions: unaffected
Identifiers
CVE-2026-109821
CNA
EEF
Weakness (CWE)
CWE-400 · CWE-1284
Tags
Published
30 Oct 2026
Updated
30 Oct 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

ScoreRatingCVSSVectorSource
6.3 Medium 4.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N CNA (EEF)
  • CISA KEV Not listed.
  • EPSS 0.0050, the 42nd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 30 Oct 2026. New records show when each source confirmed them.

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.