Buffer Overflow Affecting ruby2.5-devel package, versions <2.5.9-150700.24.6.1


Severity

Recommended
0.0
high
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.56% (43rd percentile)

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  • Snyk IDSNYK-SLES157-RUBY25DEVEL-15852731
  • published31 Mar 2026
  • disclosed26 Mar 2026

Introduced: 26 Mar 2026

CVE-2026-27820  (opens in a new tab)
CWE-120  (opens in a new tab)
CWE-131  (opens in a new tab)

How to fix?

Upgrade SLES:15.7 ruby2.5-devel to version 2.5.9-150700.24.6.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream ruby2.5-devel package and not the ruby2.5-devel package as distributed by SLES. See How to fix? for SLES:15.7 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1