Buffer Overflow Affecting truffleruby package, versions <34.0.1-r0


Severity

Recommended
0.0
critical
0
10

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Threat Intelligence

EPSS
0.56% (43rd percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-TRUFFLERUBY-16916785
  • published28 May 2026
  • disclosed16 Apr 2026

Introduced: 16 Apr 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 Chainguard truffleruby to version 34.0.1-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream truffleruby package and not the truffleruby package as distributed by Chainguard. See How to fix? for Chainguard 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