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Copy-fail-C – portable C port of CVE-2026-31431, with a checker

  • Hacker News

This is a C port of Theori/Xint's Copy Fail PoC ( https://copy.fail/ , 2026-04-29). The original depended on Python and embedded x86_64 shellcode. I managed to reimplement the shellcode as portable C using nolibc borrowed from the kernel, and now the whole thing can be compile...

  • Published: Apr 30, 2026
  • First seen: Apr 30, 2026
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AI Summary

This is a C port of Theori/Xint's Copy Fail PoC ( https://copy.fail/ , 2026-04-29). The original depended on Python and embedded x86_64 shellcode. I managed to reimplement the shellcode as portable C using nolibc borrowed from the kernel, and now the whole thing can be compile...

Best for

Teams evaluating AI product workflows / Builders comparing emerging tools / Operators tracking early category shifts

Why it matters

Primary discovery source is Hacker News.

Key Features

  • Primary public product URL is https://github.com/tgies/copy-fail-c.
  • Description: This is a C port of Theori/Xint's Copy Fail PoC ( https://copy.fail/ , 2026-04-29). The original depended on Python and embedded x86_64 shellcode. I managed to reimplement the shellcode as portable C using nolibc borr....
  • GitHub repository is linked as tgies/copy-fail-c.
  • Listed on Hacker News as "Copy-fail-C – portable C port of CVE-2026-31431, with a checker".
  • Source description: This is a C port of Theori/Xint's Copy Fail PoC ( https://copy.fail/ , 2026-04-29). The original depended on Python and embedded x86_64 shellcode. I managed to reimplement the shellcode as portable C using nolibc borr....

Use Cases

  • Primary discovery source is Hacker News.
  • A public GitHub repo is available for direct technical review.
  • Hacker News mention is recent (2026-04-30).
  • Primary public product URL is https://github.com/tgies/copy-fail-c.
  • Description: This is a C port of Theori/Xint's Copy Fail PoC ( https://copy.fail/ , 2026-04-29). The original depended on Python and embedded x86_64 shellcode. I managed to reimplement the shellcode as portable C using nolibc borr....

Why Now

Copy-fail-C – portable C port of CVE-2026-31431, with a checker is appearing on fresh discovery surfaces, so it is worth reviewing while momentum is still forming. Confidence is currently medium (49/100), so treat this as an early signal rather than a settled trend.

Community Signals

Trend score

39.3

24h momentum

Rising

Hacker News points

2

Rising

Facts / Signals / Inference / Unknowns

Facts

  • Listed on Hacker News as "Copy-fail-C – portable C port of CVE-2026-31431, with a checker".
  • Source description: This is a C port of Theori/Xint's Copy Fail PoC ( https://copy.fail/ , 2026-04-29). The original depended on Python and embedded x86_64 shellcode. I managed to reimplement the shellcode as portable C using nolibc borr....
  • Source publish date is 2026-04-30.
  • Description: This is a C port of Theori/Xint's Copy Fail PoC ( https://copy.fail/ , 2026-04-29). The original depended on Python and embedded x86_64 shellcode. I managed to reimplement the shellcode as portable C using nolibc borr....
  • GitHub repository is linked as tgies/copy-fail-c.
  • Primary public product URL is https://github.com/tgies/copy-fail-c.

Signals

  • Hacker News mention is recent (2026-04-30).
  • A public GitHub repo is available for direct technical review.
  • Primary discovery source is Hacker News.

Inference

  • Public code access can lower evaluation friction for developer audiences.

Unknowns

  • Documentation is not explicitly linked in the current allowed evidence set.
  • No tagline is stored on the current product record.
  • Pricing details are not explicitly linked in the current allowed evidence set.
  • Recent changelog or release history is not explicitly linked in the current allowed evidence set.
  • Release cadence cannot be confirmed unless a changelog or release link is explicitly provided.

Evidence Snapshots

Copy-fail-C – portable C port of CVE-2026-31431, with a checker

Listed on Hacker News as "Copy-fail-C – portable C port of CVE-2026-31431, with a checker".

Copy-fail-C – portable C port of CVE-2026-31431, with a checker GitHub repository

GitHub repository is linked as tgies/copy-fail-c.

Copy-fail-C – portable C port of CVE-2026-31431, with a checker official profile

Primary public product URL is https://github.com/tgies/copy-fail-c.

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Original Sources

Hacker News