CVE-2026-8468
Description
Allocation of Resources Without Limits or Throttling vulnerability in plug_project plug allows denial of service via unbounded buffer accumulation in multipart header parsing.
'Elixir.Plug.Conn':read_part_headers/2 in lib/plug/conn.ex does not obey its :length parameter. There is no upper bound on the size of the accumulated buffer. By contrast, the sibling function read_part_body has an explicit byte_size(acc) > length guard that stops accumulation once a limit is reached. No such guard exists in read_part_headers. An unauthenticated remote attacker can exhaust server memory by sending a crafted multipart/form-data request, causing a denial of service.
This issue affects plug from 1.4.0 before 1.15.4, 1.16.3, 1.17.1, 1.18.2, and 1.19.2.
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
plugHex | >= 1.4.0, < 1.15.4 | 1.15.4 |
plugHex | >= 1.16.0, < 1.16.3 | 1.16.3 |
plugHex | >= 1.17.0, < 1.17.1 | 1.17.1 |
plugHex | >= 1.18.0, < 1.18.2 | 1.18.2 |
plugHex | >= 1.19.0, < 1.19.2 | 1.19.2 |
Affected products
1Patches
Vulnerability mechanics
References
11- github.com/advisories/GHSA-468c-vq7p-gh64ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-8468ghsaADVISORY
- cna.erlef.org/cves/CVE-2026-8466.htmlnvdWEB
- cna.erlef.org/cves/CVE-2026-8468.htmlnvdWEB
- github.com/elixir-plug/plug/commit/2cb7958d33030aa826b0c7404375844d4593d43anvdWEB
- github.com/elixir-plug/plug/commit/33858427c7f2737d560a2e40a0c9a9270d77d1d7nvdWEB
- github.com/elixir-plug/plug/commit/aa69c5ece99c40ded88b8c6581ecc86664b0b734nvdWEB
- github.com/elixir-plug/plug/commit/d5dfffe25e975585227b1b85d247b0d14164bc45nvdWEB
- github.com/elixir-plug/plug/commit/df812a1527bae9e941965e897308a2b8bbf83a94nvdWEB
- github.com/elixir-plug/plug/security/advisories/GHSA-468c-vq7p-gh64nvdWEB
- osv.dev/vulnerability/EEF-CVE-2026-8468nvdWEB
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