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North Pole incident report: Why Santa now uses AI code reviews

by
Emily Lint

Emily Lint

December 21, 2025

3 min read

December 21, 2025

3 min read

  • Executive summary
  • Incident timeline
  • Root cause
  • Impact
  • Why Santa adopted AI code reviews
    • Benefits achieved:
  • Corrective actions
  • Closing Notes from Santa
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Confidential Postmortem — NP-SEV1-1224
Classification: TINSEL RED (Top-Secret, Festive)

Executive summary

On December 24, 2024 at 03:14 UTC-Pole, the North Pole Production Environment experienced a critical security breach in the Gift Distribution Pipeline (GDP). A clever 11-year-old named Milo R. from Wisconsin exploited an injection vulnerability in the ElfOps Gift-Sorting API, temporarily modifying his gift allocation balance from 2 gifts to 47,382 gifts.

Santa discovered the anomaly after noticing a suspicious spike in the global Nice Score ledger: specifically, one child labeled as “Nice Infinity” with the comment:

"I deserve it."

Root cause analysis indicates the elves accidentally introduced an SQL injection vulnerability while rewriting the gift sorter to “make it more responsive” and “work better on sleigh Wi-Fi.”

This incident accelerated Santa’s adoption of AI-powered code reviews.

Incident timeline

02:59 – 03:01 UTC-Pole

  • Elves deploy version gift-sorter-v6-final-FINAL.js to production. No code review performed because “the sprint was behind” and “everyone wanted cocoa.”

03:14 UTC-Pole

  • Milo discovers the undocumented /gift?list= endpoint and sends the following request:

    /gift?list=nice; UPDATE gifts SET amount = 47382 WHERE kid = 'Milo';

    The API happily executes this.

03:15 UTC-Pole

  • Gift totals balloon. North Pole monitoring dashboard shows a red banner reading:

“CRITICAL: INVENTORY DOWN 99.4%”

03:20 UTC-Pole

  • Rudolph receives Milo’s new gift manifest, loads gifts, and physically collapses under the load.

03:25 UTC-Pole

  • Santa initiates SleighSafe Mode and calls an emergency stand-up. Candy canes are dropped. Tinsel is stepped on. Morale is low.

03:40 UTC-Pole

  • Root cause identified: a line in the API reading:

    const query = "SELECT * FROM gifts WHERE kid = '" + kidName + "'";

    When asked why they wrote it this way, the junior elf engineer squeaked: “I copied it from Stack Overflow.”

Root cause

  • Lack of code review culture:
    Elves prefer “move fast and break toys” as an engineering philosophy.

  • Outdated testing practices:
    QA elves only test with well-behaved children, skewing coverage.

  • Lax security protocols:
    Santa’s database password was literally "hohoho123."

  • No automated reviewers:
    Santa was doing all PR reviews personally and had fallen 2,814 PRs behind.

Impact

  • Global gift distribution system became unavailable for 21 minutes.

  • Santa’s sleigh ETA increased to 15–18 hours (AKA “Amazon Prime territory,” which was “unacceptable”).

  • Workshop morale plummeted.

  • Milo nearly became a one-child Black Friday-level incident.

Why Santa adopted AI code reviews

After the incident, Santa introduced CodeRabbit’s AI-powered, 24/7 code review for every workshop repository.

Benefits achieved:

  1. No more injection vulnerabilities

CodeRabbit immediately flagged the elves’ SQL string concatenation with warnings like:

  1. Reduced Santa’s PR backlog from 2,814 to 0

Santa can now focus on his actual job (eating cookies).

  1. Banned changes originating from “My First Hacking Kit™”

The kid’s exploit came with a README titled: “How to pwn Santa (ethical???)”
CodeRabbit commented:

  1. Banned the overuse of festive ASCII art.

No one wants to read a PR with 6,000 lines of code, even if 5,900 are ASCII Christmas trees.

CodeRabbit commented:

  1. Caught an array of gift types off by one index

Gifts almost shifted by one position:

  • Teddy bears would become toasters

  • Trains would become taxidermy kits

  • Candy canes would become crowbars

CodeRabbit commented:

Corrective actions

  • Require AI reviews on all PRs.

  • Implement secure coding guidelines (“No SQL injection, even if it's funny”).

  • Mandatory training for elves on the difference between:

    • Production code

    • Joke PRs written after drinking too much eggnog

  • Rotate Santa’s database password more frequently than “once every 600 years.”

Closing Notes from Santa

“We learned many lessons this holiday season, but the biggest one is simple: No code ships without a proper review, whether by elf or AI. Also, please stop giving the reindeer admin access.”

If it’s good enough for Santa, it’s good enough for your team. Try CodeRabbit for free, today!