How many CVEs have patched writeH1?

2 published CVEs changed writeH1 in nodejs/undici, in 4 distinct patches totalling 13 changed lines, between 2026 and 2026.

What is the latest CVE that changed writeH1?

CVE-2026-15157 (undici vulnerable to CRLF Injection via blob-like body 'type' property), published 2026-07-29, changed lines 1138 to 1147 of lib/dispatcher/client-h1.js.

How does writeH1 compare to the rest of nodejs/undici?

nodejs/undici has 32 CVEs with a located fix in total; 2 of them changed writeH1.

What do the line numbers refer to?

Line numbers are in the fixed version of the file, as the upstream patch left it. A CVE whose fix was backported to several branches is listed once, with the lines from the upstream commit.

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WriteH1

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Patched Functions
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Undici
WriteH1

writeH1 in nodejs/undici: Patched by 2 CVEs

nodejs/undici

Function

writeH1

Name: writeH1 in nodejs/undici: CVE fixes
Creator: RadicalNotion.AI
License: https://creativecommons.org/licenses/by-nc/4.0/

lib/dispatcher/client-h1.js

Last patched July 29, 2026

CVEs

That changed this function

Distinct patches

Backports counted once

Lines changed

Added plus removed

2026

Years

By CVE publication date

Overview

writeH1 in nodejs/undici was changed by 2 published CVE fixes in 2026, in 4 distinct patches that added or removed 13 lines in total.

nodejs/undici has 32 CVEs with a located fix in total, so 6% of them touched this function.

CVEs that patched it

Every published CVE whose fix changed writeH1, newest first, with the lines each fix touched.

On this page

Overview
CVEs that patched it
Other functions in these files
Other hotspots in the repository
FAQ
References

undici vulnerable to CRLF Injection via blob-like body 'type' property
CVE-2026-15157 · lines 1138–1147 · +10 −2
Medium · CVSS 5.4
EPSS 0.2%2026-07-29
undici vulnerable to HTTP response queue poisoning via keep-alive socket reuse
CVE-2026-6733 · line 1186 · +1 −0
Low · CVSS 3.7
EPSS 0.3%2026-06-17

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Other functions in these files

Functions in the same file that CVE fixes also changed.

1busylib/dispatcher/client-h1.js1 CVEs · 1 patches2026
2clearIdleSocketValidationlib/dispatcher/client-h1.js1 CVEs · 1 patches2026
3connectH1lib/dispatcher/client-h1.js1 CVEs · 1 patches2026
4onHttpSocketCloselib/dispatcher/client-h1.js1 CVEs · 1 patches2026
5readMorelib/dispatcher/client-h1.js1 CVEs · 1 patches2026

Other hotspots in the repository

Functions in nodejs/undici changed by the most CVE fixes.

processHeader3 CVEs · lib/core/request.js canCacheResponse2 CVEs · lib/handler/cache-handler.js httpRedirectFetch2 CVEs · lib/fetch/index.js shouldRetry2 CVEs · lib/handler/retry-handler.js parseCacheControlHeader2 CVEs · lib/util/cache.js checkpointResponseEnd1 CVEs · lib/handler/retry-handler.js

All patched functions in nodejs/undici

Frequently asked questions

Common questions about CVE fixes to writeH1.

How many CVEs have patched writeH1?: 2 published CVEs changed writeH1 in nodejs/undici, in 4 distinct patches totalling 13 changed lines, between 2026 and 2026.
What is the latest CVE that changed writeH1?: CVE-2026-15157 (undici vulnerable to CRLF Injection via blob-like body 'type' property), published 2026-07-29, changed lines 1138 to 1147 of lib/dispatcher/client-h1.js.
How does writeH1 compare to the rest of nodejs/undici?: nodejs/undici has 32 CVEs with a located fix in total; 2 of them changed writeH1.
What do the line numbers refer to?: Line numbers are in the fixed version of the file, as the upstream patch left it. A CVE whose fix was backported to several branches is listed once, with the lines from the upstream commit.

References

lib/dispatcher/client-h1.js on GitHub (opens in a new tab)
All patched functions in nodejs/undici
Patched functions directory

Fix locations are computed by RadicalNotion.AI from the upstream patch diff of each CVE. CVE data is sourced from the CVE Program.

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