CVE-2026-8468
Plug: Unbounded buffer accumulation in multipart header parsing causes denial of service
描述
### Summary An Allocation of Resources Without Limits or Throttling vulnerability in `Plug.Conn.read_part_headers/2` allows an unauthenticated attacker to exhaust server memory by sending a crafted `multipart/form-data` request, causing a denial of service. ### Details `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`. ### Impact This is a denial-of-service vulnerability. Any application using `Plug.Parsers` with the `:multipart` parser, or calling `Plug.Conn.read_part_headers/2` directly, is affected. An unauthenticated remote attacker can trigger the issue by sending crafted HTTP requests with no special privileges. ### References * Intro Commit: https://github.com/elixir-plug/plug/commit/c52b2f32c90bccd718202bafccb5f95594e30183 * Patch Commit: https://github.com/elixir-plug/plug/commit/d878b42efea9f12b243dc3e362a2ed048a798203
如何修補 CVE-2026-8468
要修補 CVE-2026-8468,請將受影響套件升級到下列已修補版本。
- —升級至 1.15.4 或更新版本
CVE-2026-8468 正在被利用嗎?
低 — EPSS 為 0.6%,目前沒有觀察到大規模利用活動。
受影響套件(1)
- >= 1.4.0, < 1.15.4
CVSS 分數
| 來源 | 版本 | 嚴重程度 | 向量 |
|---|---|---|---|
| osv | CVSS 4.0 | — | 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 |