🛡️ USN-8478-1 — ruby2.7

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

ruby2.7, ruby3.0, ruby3.2, ruby3.3 vulnerabilities

It was discovered that Ruby's Net::IMAP library did not properly verify

that TLS encryption was started after issuing a STARTTLS command. A remote

attacker could use this to perform a machine-in-the-middle attack and silently

bypass TLS encryption. (CVE-2026-42246)

It was discovered that Ruby's Net::IMAP library did not validate

string arguments passed to certain commands. A remote attacker could use

this to inject arbitrary IMAP commands. (CVE-2026-42257)

It was discovered that Ruby's Net::IMAP library was vulnerable to a

denial of service attack when authenticating with SCRAM-SHA1 or

SCRAM-SHA256. A hostile server could send a very large iteration count

value to cause excessive computation in the client. This issue only

affected ruby3.3. (CVE-2026-42256)

Affected software

USN-8478-1 is recorded against 4 packages.

  • ruby2.7 (fixed in 2.7.0-5ubuntu1.18+esm5)
  • ruby3.0 (fixed in 3.0.2-7ubuntu2.13)
  • ruby3.2 (fixed in 3.2.3-1ubuntu0.24.04.8)
  • ruby3.3 (fixed in 3.3.8-2ubuntu3.1)

Timeline and source

Published on 29 June 2025 and last revised on 30 June 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

ubuntu.com (Advisory)
ubuntu.com (Report)
ubuntu.com (Report)
ubuntu.com (Report)

Details

Severity Unknown
CVSS Score N/A
CVSS Vector N/A
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2025-06-29
Updated 2026-08-12
Modified 2026-06-30
Fix URL N/A

Affected Packages

Software From version Fixed in
ruby2.7 — 2.7.0-5ubuntu1.18+esm5
ruby3.0 — 3.0.2-7ubuntu2.13
ruby3.2 — 3.2.3-1ubuntu0.24.04.8
ruby3.3 — 3.3.8-2ubuntu3.1

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