USN-8556-1: ruby2.3 Ubuntu

CVSS: UnknownPublished
Published 16-07-2026Last modified 16-07-2026
Open JSON

Vulnerability summary

USN-8556-1 is a vulnerability in ruby2.3 Ubuntu with no CVSS score yet.

Overall risk
0/100
0100
Minimal · default modelHow is this calculated?
CVSS score
Not scored
010
No CVSS score recorded
EPSS score
Not scored
0%100%
No EPSS score yet
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 2 · Downstream 0 · Related 2
CVE-2026-27820CVE-2026-42258

Timeline

  1. 16-07-2026
    PublishedVulnerability first disclosed.
  2. 16-07-2026
    Last modifiedVulnerability information updated.

Description

ruby2.3 vulnerabilities It was discovered that the Net::IMAP client in Ruby did not properly sanitize Symbol arguments passed to IMAP commands. A remote attacker controlling a malicious IMAP server, or able to influence command arguments, could use this to inject arbitrary IMAP commands via CRLF sequences. (CVE-2026-42258) It was discovered that the Zlib::GzipReader in Ruby did not correctly ensure sufficient buffer capacity in the zstream_buffer_ungets function. An attacker could use this to craft a gzip stream that, when processed, could cause a buffer overflow, resulting in memory corruption and possibly arbitrary code execution. (CVE-2026-27820)

CVSS metrics

Risk metrics not yet published.

EPSS trend

No EPSS score has been published for this record yet.

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu1 product
  • ruby2.3< 2.3.1-2~ubuntu16.04.16+esm15

1 vendor · 1 product

References

3 links