CVE-2026-27820

Katalog CVE

CVSS 9.8 · Critical EPSS 0,75%

Kerentanan Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') pada ruby-lang zlib. Skor CVSS 3.1 9.8 (Critical) menurut NVD.

Deskripsi (NVD)

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.

Rincian

Terbit di NVD

16 April 2026

Terakhir diubah

17 Juni 2026

Status NVD

Analyzed

CVSS 3.1

9.8 (Critical), sumber NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CWE-131: Incorrect Calculation of Buffer Size

EPSS (30 hari)

0,75% peluang dieksploitasi; lebih tinggi dari 53,8% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://github.com/ruby/zlib/security/advisories/GHSA-g857-hhfv-j68w advisory vendor
• https://hackerone.com/reports/3467067 permissions required