[Aikido] Fix 9 security issues in puma, json, net-imap and 2 more

[aikido-autofix]

Upgrade Puma, JSON, Net-IMAP, Msgpack, and Psych to fix DoS, memory exhaustion, heap corruption, source IP spoofing, and command injection vulnerabilities.

✅ 9 CVEs resolved by this upgrade

This PR will resolve the following CVEs:

Issue	Severity	Description
CVE-2026-47736	LOW	[puma] PROXY protocol v1 support allows attackers to send continuous bytes without CRLF terminators, causing unbounded memory growth and CPU consumption that can lead to process OOM or denial of service through a single unauthenticated TCP connection.
CVE-2026-47737	LOW	[puma] Source IP spoofing vulnerability when PROXY protocol v1 is enabled with persistent connections; attackers can inject malicious PROXY headers between keep-alive requests to spoof REMOTE_ADDR, potentially bypassing security controls like rate limiting or access lists.
AIKIDO-2026-10977	LOW	[json] A heap buffer overflow vulnerability exists in the native generator when computing output buffer capacity for repeated indent/spacing strings, potentially causing memory corruption. Additionally, an unchecked depth option can cause denial of service through excessive nesting work.
AIKIDO-2026-10978	LOW	[json] A use-after-free vulnerability in JSON parsing allows concurrent mutation of the source string during parsing through Ruby-level hooks, potentially causing memory corruption and parsed value divergence. The patch freezes or copies the source buffer to prevent modification during parsing.
CVE-2026-47240	LOW	[net-imap] IMAP command injection vulnerability where non-synchronizing literals in raw data arguments can be interpreted as new commands on servers lacking LITERAL+/LITERAL-/IMAP4rev2 support, enabling arbitrary IMAP command execution. Affects search, sort, thread, and fetch commands when processing unvalidated user input.
CVE-2026-47242	LOW	[net-imap] The #id and #enable commands fail to validate arguments, allowing attackers to inject arbitrary IMAP commands via CRLF sequences. This could enable command injection attacks when untrusted input is passed to these methods, potentially leading to unauthorized mailbox operations.
CVE-2026-47241	LOW	[net-imap] A regex validation bypass in IMAP commands allows attackers to inject literal-continuation markers (e.g., {0}) that cause command absorption and connection hangs, resulting in denial of service. The vulnerability affects search, sort, thread, and fetch commands when processing user-controlled input.
AIKIDO-2026-11117	LOW	[msgpack] A use-after-free vulnerability in the Buffer clear method fails to reset cursor pointers, allowing freed memory pages to be reused and causing data corruption or information disclosure between buffers in the same process.
AIKIDO-2026-11069	LOW	[psych] A heap out-of-bounds write vulnerability exists in the YAML parser's IO reader callback, which fails to validate the length of data returned by IO#read operations. This allows attackers to trigger a buffer overflow and achieve remote code execution through Psych.load, Psych.safe_load, or Psych.parse.

🔗 Related Tasks

• https://aikido.atlassian.net/browse/AIK-14881

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[aikido-autofix]

Closed by Aikido: a new AutoFix has been created → #302