Vulnerability in plug (CVE-2026-8468)
Summary
Vulnerability in plug (CVE-2026-8468). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 1.15.4, 1.16.3, 1.17.1, 1.18.2, 1.19.2 or later.
Original description
The description as published by the source.
Summary
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.
Configurations
The application must use Plug.Parsers with the :multipart parser, or otherwise call Plug.Conn.read_part_headers/2 to process multipart/form-data request bodies. Deployments that do not handle multipart uploads are not affected.
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-8468 has been found in plug.
Risk of unauthorized operations or information disclosure.
What to do: upgrade plug to 1.15.4, 1.16.3, 1.17.1, 1.18.2, 1.19.2 or later.
If unsure, ask your IT team or search "plug CVE-2026-8468" on the vendor's site.
CVE-2026-8468 (plug) — CWE-770
Patched: 1.15.4, 1.16.3, 1.17.1, 1.18.2, 1.19.2 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-770) exists in plug.
Check the vendor advisory for the affected versions of plug.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 1.15.4, 1.16.3, 1.17.1, 1.18.2, 1.19.2.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'plug' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'plug' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
plugを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade plug to 1.15.4, 1.16.3, 1.17.1, 1.18.2, 1.19.2ステージング環境で 1.15.4, 1.16.3, 1.17.1, 1.18.2, 1.19.2 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory github.com
- advisory nvd.nist.gov
- package hex.pm
- package github.com
- patch github.com
- patch github.com
- patch github.com
- patch github.com
- patch github.com
- web cna.erlef.org
- web cna.erlef.org
- web osv.dev
- web github.com