CVE-2026-8468Unbounded buffer accumulation in multipart header parsing causes denial of service in plug
- 8.2HighCVSS base score
- 0.62%Exploitation in 30 daysEPSS · top 50% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By EEF
- 1 day later
· 1 day later
Published
- 13 days later
· 13 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| EEFCNA (assigner) | 4.0 | High8.2 | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
| NVDNVD · Deferred | 4.0 | High8.2 | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
- EPSS (exploitation in 30 days)
- 0.62% · top 50% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.2.
Affected products
- affected 1.4.0 – < 1.15.4
- affected 1.16.0 – < 1.16.3
- affected 1.17.0 – < 1.17.1
- affected 1.18.0 – < 1.18.2
- affected 1.19.0 – < 1.19.2
- affected c52b2f32c90bccd718202bafccb5f95594e30183 – < *
Affected packages
From reviewed advisories of the GitHub Advisory Database.
References
References9
- https://github.com/elixir-plug/plug/security/advisories/GHSA-468c-vq7p-gh64 (opens in a new tab)vendor-advisoryrelated
- https://cna.erlef.org/cves/CVE-2026-8468.html (opens in a new tab)related
- https://osv.dev/vulnerability/EEF-CVE-2026-8468 (opens in a new tab)related
- https://cna.erlef.org/cves/CVE-2026-8466.html (opens in a new tab)related
- https://github.com/elixir-plug/plug/commit/2cb7958d33030aa826b0c7404375844d4593d43a (opens in a new tab)patch
- https://github.com/elixir-plug/plug/commit/aa69c5ece99c40ded88b8c6581ecc86664b0b734 (opens in a new tab)patch
- https://github.com/elixir-plug/plug/commit/d5dfffe25e975585227b1b85d247b0d14164bc45 (opens in a new tab)patch
- https://github.com/elixir-plug/plug/commit/df812a1527bae9e941965e897308a2b8bbf83a94 (opens in a new tab)patch
- https://github.com/elixir-plug/plug/commit/33858427c7f2737d560a2e40a0c9a9270d77d1d7 (opens in a new tab)patch
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-30266 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-468c-vq7p-gh64 (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-8468)Record last updated .