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http3: limit frame size to prevent unbounded memory allocation#250

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BiswajeetRay7:fix-http3-header-size-limit
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http3: limit frame size to prevent unbounded memory allocation#250
BiswajeetRay7 wants to merge 1 commit into
golang:masterfrom
BiswajeetRay7:fix-http3-header-size-limit

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@BiswajeetRay7

@BiswajeetRay7 BiswajeetRay7 commented Jun 9, 2026

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Without a size limit on incoming HTTP/3 frames, a malicious client
could send an arbitrarily large HEADERS frame causing unbounded
memory allocation and an OOM crash.

This adds a maxHeaderSectionSize constant (10MB) matching the
default MaxHeaderListSize used by the HTTP/2 implementation.

Fixes potential DoS via oversized HEADERS frames.

Fixes golang/go#79922

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This PR (HEAD: 17b15fd) has been imported to Gerrit for code review.

Please visit Gerrit at https://go-review.googlesource.com/c/net/+/788863.

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Without a size limit on incoming HTTP/3 frames, a malicious client
could send an arbitrarily large HEADERS frame causing unbounded
memory allocation and an OOM crash.

This adds a maxHeaderSectionSize constant (10MB) matching the
default MaxHeaderListSize used by the HTTP/2 implementation.

Fixes potential DoS via oversized HEADERS frames.

Fixes golang/go#79922
@BiswajeetRay7 BiswajeetRay7 force-pushed the fix-http3-header-size-limit branch from 17b15fd to 00fb81d Compare June 9, 2026 17:34
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Message from Gopher Robot:

Patch Set 1:

(1 comment)


Please don’t reply on this GitHub thread. Visit golang.org/cl/788863.
After addressing review feedback, remember to publish your drafts!

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This PR (HEAD: 00fb81d) has been imported to Gerrit for code review.

Please visit Gerrit at https://go-review.googlesource.com/c/net/+/788863.

Important tips:

  • Don't comment on this PR. All discussion takes place in Gerrit.
  • You need a Gmail or other Google account to log in to Gerrit.
  • To change your code in response to feedback:
    • Push a new commit to the branch used by your GitHub PR.
    • A new "patch set" will then appear in Gerrit.
    • Respond to each comment by marking as Done in Gerrit if implemented as suggested. You can alternatively write a reply.
    • Critical: you must click the blue Reply button near the top to publish your Gerrit responses.
    • Multiple commits in the PR will be squashed by GerritBot.
  • The title and description of the GitHub PR are used to construct the final commit message.
    • Edit these as needed via the GitHub web interface (not via Gerrit or git).
    • You should word wrap the PR description at ~76 characters unless you need longer lines (e.g., for tables or URLs).
  • See the Sending a change via GitHub and Reviews sections of the Contribution Guide as well as the FAQ for details.

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Message from Gopher Robot:

Patch Set 1:

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Please don’t reply on this GitHub thread. Visit golang.org/cl/788863.
After addressing review feedback, remember to publish your drafts!

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Message from Biswajeet Ray:

Patch Set 1:

(1 comment)


Please don’t reply on this GitHub thread. Visit golang.org/cl/788863.
After addressing review feedback, remember to publish your drafts!

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x/net/http3: missing header frame size limit allows OOM

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