CVE-2026-18540 (LOW): detected in Lambda Docker Images.

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評価

難易度
3/5
見積もり時間
1〜2日
初心者へのやさしさ
55/100
issue の種類
バグ
明瞭さ
おおむね明確
活発さ
活発
技術スタック
aws, docker, node.js
領域
cloud, devops, security

調査の方向性

Start by locating the build definitions for the affected Lambda Node.js images: latest, 26-preview, 24, and 22. Check how undici 6.27.0 enters the images, update it to a listed fixed version, then rebuild and scan the images to confirm the vulnerable version is absent.

索引モデルが issue の本文から書いたものです。

説明

CVE Details

CVE ID Severity Affected Package Installed Version Fixed Version Date Published Date of Scan
CVE-2026-18540 LOW undici 6.27.0 6.28.1, 7.29.1, 8.10.2 2026-09-04T18:17:50.02Z 2026-09-30T10:18:20.696138078Z

Affected Docker Images

Image Name SHA
public.ecr.aws/lambda/nodejs:latest public.ecr.aws/lambda/nodejs@sha256:523ce8499e16c3bff599c94691e1c6a1405aac415c13b95b98dbb9dddd052b77
public.ecr.aws/lambda/nodejs:26-preview public.ecr.aws/lambda/nodejs@sha256:f5118e838e4efe4462b87cb77b1b255170952560a5766ad9c0d3f30016c57800
public.ecr.aws/lambda/nodejs:24 public.ecr.aws/lambda/nodejs@sha256:523ce8499e16c3bff599c94691e1c6a1405aac415c13b95b98dbb9dddd052b77
public.ecr.aws/lambda/nodejs:22 public.ecr.aws/lambda/nodejs@sha256:282bd7028e6d1f365a3a174751634c7a84e12ef8a466cdcf786c3f4d744e743a

Description

undici's retry interceptor can append the body of a ranged retry response to bytes already delivered from an earlier partial response while still presenting the original response's status and headers. This happens when an upstream server delivers part of a body without a trustworthy resume checkpoint, for example a non-success response whose headers were already sent or a partial-content response with an unusable content range, then closes the connection and answers the resumed range request with more bytes. As a result the response body can be longer than the Content-Length that the application observes. An application that relays such a response to a downstream HTTP/1.1 peer without normalizing the framing can emit a body that exceeds the forwarded Content-Length, and the excess bytes can be interpreted as the start of a following response, which enables downstream response splitting or desynchronization. Exploitation requires an attacker-controlled upstream server and an application that forwards the response through a framing-sensitive path. This affects undici versions before 6.28.1, from 7.0.0 up to 7.29.1, and from 8.0.0 up to 8.10.2. Users should upgrade to undici 6.28.1, 7.29.1, or 8.10.2.

Remediation Steps
  • Update the affected package undici from version 6.27.0 to 6.28.1, 7.29.1, 8.10.2.
About this issue
  • This issue may not contain all the information about the CVE nor the images it affects.
  • This issue will not be updated with new information and the list of affected images may have changed since the creation of this issue.
  • For more, visit Lambda Watchdog.
  • This issue was created automatically by Lambda Watchdog.
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