# CVE-2026-15157: node-undici: undici does not validate the type property of a duck-typed blob-like request body before using it as the Content-Type...

CVE-2026-15157 is fixed in 21 products on 1 platform, first by DEBIAN-CVE-2026-15157, released August 5, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-15157
- Priority: Routine
- CVSS: 5.4 (medium)
- EPSS: 0.0026
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 29, 2026

## Description

undici does not validate the type property of a duck-typed blob-like request body before using it as the Content-Type header on the HTTP/1.1 dispatcher. In undici before 6.28.0, from 7.0.0 up to before 7.29.0, and from 8.0.0 up to before 8.9.0, an application that passes a hand-rolled blob-like body (via request, stream, pipeline, or dispatch) whose type is derived from untrusted input allows an attacker to inject CRLF sequences and append arbitrary HTTP headers, potentially smuggling a second request past the upstream. Native Blob objects are safe because their constructor strips CRLF from the type, and fetch is unaffected because it validates headers, but ecosystem libraries that build duck-typed blob shapes from user input can reach the vulnerable path. This is the same defect class as CVE-2022-35948 and CVE-2026-1527, on a header sink that the earlier fixes did not cover. The issue is fixed in undici 6.28.0, 7.29.0, and 8.9.0.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | node-undici Debian 14 | 8.9.0+dfsg+~cs3.2.0-1 | [DEBIAN-CVE-2026-15157](https://patchblox.com/security/data/fix/linux/debian-cve-2026-15157.md) | Aug 5, 2026 |
| Linux | nodejs22 amzn 2023 | 1:22.23.2-1.amzn2023.0.2 | [ALAS2023-2026-2060](https://patchblox.com/security/data/fix/linux/alas2023-2026-2060.md) | Aug 17, 2026 |
| Linux | nodejs22-debuginfo amzn 2023 | 1:22.23.2-1.amzn2023.0.2 | [ALAS2023-2026-2060](https://patchblox.com/security/data/fix/linux/alas2023-2026-2060.md) | Aug 17, 2026 |
| Linux | nodejs22-debugsource amzn 2023 | 1:22.23.2-1.amzn2023.0.2 | [ALAS2023-2026-2060](https://patchblox.com/security/data/fix/linux/alas2023-2026-2060.md) | Aug 17, 2026 |
| Linux | nodejs22-devel amzn 2023 | 1:22.23.2-1.amzn2023.0.2 | [ALAS2023-2026-2060](https://patchblox.com/security/data/fix/linux/alas2023-2026-2060.md) | Aug 17, 2026 |
| Linux | nodejs22-docs amzn 2023 | 1:22.23.2-1.amzn2023.0.2 | [ALAS2023-2026-2060](https://patchblox.com/security/data/fix/linux/alas2023-2026-2060.md) | Aug 17, 2026 |
| Linux | nodejs22-full-i18n amzn 2023 | 1:22.23.2-1.amzn2023.0.2 | [ALAS2023-2026-2060](https://patchblox.com/security/data/fix/linux/alas2023-2026-2060.md) | Aug 17, 2026 |
| Linux | nodejs22-libs amzn 2023 | 1:22.23.2-1.amzn2023.0.2 | [ALAS2023-2026-2060](https://patchblox.com/security/data/fix/linux/alas2023-2026-2060.md) | Aug 17, 2026 |
| Linux | nodejs22-libs-debuginfo amzn 2023 | 1:22.23.2-1.amzn2023.0.2 | [ALAS2023-2026-2060](https://patchblox.com/security/data/fix/linux/alas2023-2026-2060.md) | Aug 17, 2026 |
| Linux | nodejs22-npm amzn 2023 | 1:10.9.8-1.22.23.2.1.amzn2023.0.2 | [ALAS2023-2026-2060](https://patchblox.com/security/data/fix/linux/alas2023-2026-2060.md) | Aug 17, 2026 |
| Linux | nodejs24 amzn 2023 | 1:24.18.1-1.amzn2023.0.2 | [ALAS2023-2026-2059](https://patchblox.com/security/data/fix/linux/alas2023-2026-2059.md) | Aug 17, 2026 |
| Linux | nodejs24-debuginfo amzn 2023 | 1:24.18.1-1.amzn2023.0.2 | [ALAS2023-2026-2059](https://patchblox.com/security/data/fix/linux/alas2023-2026-2059.md) | Aug 17, 2026 |
| Linux | nodejs24-debugsource amzn 2023 | 1:24.18.1-1.amzn2023.0.2 | [ALAS2023-2026-2059](https://patchblox.com/security/data/fix/linux/alas2023-2026-2059.md) | Aug 17, 2026 |
| Linux | nodejs24-devel amzn 2023 | 1:24.18.1-1.amzn2023.0.2 | [ALAS2023-2026-2059](https://patchblox.com/security/data/fix/linux/alas2023-2026-2059.md) | Aug 17, 2026 |
| Linux | nodejs24-docs amzn 2023 | 1:24.18.1-1.amzn2023.0.2 | [ALAS2023-2026-2059](https://patchblox.com/security/data/fix/linux/alas2023-2026-2059.md) | Aug 17, 2026 |
| Linux | nodejs24-full-i18n amzn 2023 | 1:24.18.1-1.amzn2023.0.2 | [ALAS2023-2026-2059](https://patchblox.com/security/data/fix/linux/alas2023-2026-2059.md) | Aug 17, 2026 |
| Linux | nodejs24-libs amzn 2023 | 1:24.18.1-1.amzn2023.0.2 | [ALAS2023-2026-2059](https://patchblox.com/security/data/fix/linux/alas2023-2026-2059.md) | Aug 17, 2026 |
| Linux | nodejs24-libs-debuginfo amzn 2023 | 1:24.18.1-1.amzn2023.0.2 | [ALAS2023-2026-2059](https://patchblox.com/security/data/fix/linux/alas2023-2026-2059.md) | Aug 17, 2026 |
| Linux | nodejs24-npm amzn 2023 | 1:11.16.0-1.24.18.1.1.amzn2023.0.2 | [ALAS2023-2026-2059](https://patchblox.com/security/data/fix/linux/alas2023-2026-2059.md) | Aug 17, 2026 |
| Linux | v8-12.4-devel amzn 2023 | 3:12.4.254.21-1.22.23.2.1.amzn2023.0.2 | [ALAS2023-2026-2060](https://patchblox.com/security/data/fix/linux/alas2023-2026-2060.md) | Aug 17, 2026 |
| Linux | v8-13.6-devel amzn 2023 | 3:13.6.233.17-1.24.18.1.1.amzn2023.0.2 | [ALAS2023-2026-2059](https://patchblox.com/security/data/fix/linux/alas2023-2026-2059.md) | Aug 17, 2026 |

---

Data as of 2026-11-08T19:12:23Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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