CVE-2026-27820: ruby zlib, грешка в паметта

Описание

Оригинално описание

zlib is a Ruby interface for the zlib compression/decompression library. Versions 3.0.0 and below, 3.1.0, 3.1.1, 3.2.0 and 3.2.1 contain a buffer overflow vulnerability in the Zlib::GzipReader. The zstream_buffer_ungets function prepends caller-provided bytes ahead of previously produced output but fails to guarantee the backing Ruby string has enough capacity before the memmove shifts the existing data. This can lead to memory corruption when the buffer length exceeds capacity. This issue has been fixed in versions 3.0.1, 3.1.2 and 3.2.3.

Засегнати продукти

• ruby zlib: < 3.0.1; >= 3.1.0, < 3.1.2; >= 3.2.0, < 3.2.3

Вид слабост

• CWE-120 Копиране в буфер без проверка на размера на входа
• CWE-131 Неправилно изчисляване на размер на буфер

История

Първоизточници

• https://www.cve.org/CVERecord?id=CVE-2026-27820
• https://nvd.nist.gov/vuln/detail/CVE-2026-27820
• https://github.com/ruby/zlib/security/advisories/GHSA-g857-hhfv-j68w
• https://hackerone.com/reports/3467067