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CVE-2018-12026

Phusion Passenger SpawningKit Contains Arbitrary Read/Write Vulnerability

9.8 CriticalFix available

During the spawning of a malicious Passenger-managed application, SpawningKit in Phusion Passenger 5.3.x before 5.3.2 allows such applications to replace key files or directories in the spawning communication directory with symlinks. This then could result in arbitrary reads and writes, which in turn can result in information disclosure and privilege escalation.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

1.92%Up 1.3 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 9.8

During the spawning of a malicious Passenger-managed application, SpawningKit in Phusion Passenger 5.3.x before 5.3.2 allows such applications to replace key files or directories in the spawning communication directory with symlinks. This then could result in arbitrary reads and writes, which in turn can result in information disclosure and privilege escalation.

Record
CVE-2018-12026
CVSS 3.0
9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0
7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Weakness
CWE-59
Updated
2026-11-02
CVE List No score

During the spawning of a malicious Passenger-managed application, SpawningKit in Phusion Passenger 5.3.x before 5.3.2 allows such applications to replace key files or directories in the spawning communication directory with symlinks. This then could result in arbitrary reads and writes, which in turn can result in information disclosure and privilege escalation.

Record
CVE-2018-12026
Updated
2026-11-02
EUVDEUVD-2022-2976 No score

During the spawning of a malicious Passenger-managed application, SpawningKit in Phusion Passenger 5.3.x before 5.3.2 allows such applications to replace key files or directories in the spawning communication directory with symlinks. This then could result in arbitrary reads and writes, which in turn can result in information disclosure and privilege escalation.

Record
EUVD-2022-2976
Updated
2026-11-03
GitHub AdvisoriesGHSA-7cv3-gvmc-8mq5 9.8

Phusion Passenger SpawningKit Contains Arbitrary Read/Write Vulnerability

During the spawning of a malicious Passenger-managed application, SpawningKit in Phusion Passenger 5.3.x before 5.3.2 allows such applications to replace key files or directories in the spawning communication directory with symlinks. This then could result in arbitrary reads and writes, which in turn can result in information disclosure and privilege escalation.

Record
GHSA-7cv3-gvmc-8mq5
CVSS 3.0
9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-59
Updated
2026-11-02
OSV 9.8

During the spawning of a malicious Passenger-managed application, SpawningKit in Phusion Passenger 5.3.x before 5.3.2 allows such applications to replace key files or directories in the spawning communication directory with symlinks. This then could result in arbitrary reads and writes, which in turn can result in information disclosure and privilege escalation.

Record
CVE-2018-12026
CVSS 3.0
9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVGHSA-7cv3-gvmc-8mq5 9.8

Phusion Passenger SpawningKit Contains Arbitrary Read/Write Vulnerability

During the spawning of a malicious Passenger-managed application, SpawningKit in Phusion Passenger 5.3.x before 5.3.2 allows such applications to replace key files or directories in the spawning communication directory with symlinks. This then could result in arbitrary reads and writes, which in turn can result in information disclosure and privilege escalation.

Record
GHSA-7cv3-gvmc-8mq5
CVSS 3.0
9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-59
Updated
2026-11-02
OSVUBUNTU-CVE-2018-12026 9.8

During the spawning of a malicious Passenger-managed application, SpawningKit in Phusion Passenger 5.3.x before 5.3.2 allows such applications to replace key files or directories in the spawning communication directory with symlinks. This then could result in arbitrary reads and writes, which in turn can result in information disclosure and privilege escalation.

Record
UBUNTU-CVE-2018-12026
CVSS 3.0
9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVopenSUSE-SU-2024:11341-1 No score

ruby2.7-rubygem-passenger-6.0.8-3.2 on GA media

These are all security issues fixed in the ruby2.7-rubygem-passenger-6.0.8-3.2 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:11341-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
passenger
RubyGems
5.3.0 up to 5.3.2
5.3.2
passenger
RubyGems
5.3.0 up to 5.3.2, plus listed versions
5.3.1
5.3.2

History

History
RecordedChangedSources
facts
affected
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2018-12026 is a critical vulnerability (CVSS 9.8) in Phusion Passenger, published June 17, 2018. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.92%, the 80th percentile. Fixed in passenger 5.3.2.

References

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