SB2026052155 - Splunk Universal Forwarder update for third-party components (May 2026)

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Main Vulnerability Database SB2026052155

SB2026052155 - Splunk Universal Forwarder update for third-party components (May 2026)

Published: May 21, 2026

Security Bulletin ID SB2026052155
CSH Severity
Critical
Patch available
YES
Number of vulnerabilities 4
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

Critical 25% Medium 75%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 4 vulnerabilities.


1) Heap-based buffer overflow (CVE-ID: CVE-2024-12084)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Red


The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error when handling checksum lengths (s2length). A remote attacker can send specially crafted packets to the daemon, trigger a heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.


2) Information disclosure (CVE-ID: CVE-2024-12086)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to excessive data output by the application when handling checksums. A remote attacker can trick the victim into connecting to an attacker-controlled server and enumerate contents of arbitrary files on the client's machine, basically allowing a rouge server to read contents byte-by-byte of any file on the client's system.

This issue occurs when files are being copied from a client to a server.


3) Path traversal (CVE-ID: CVE-2024-12087)

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote server to write files to arbitrary locations on the system.

The vulnerability exists due to input validation error when using "--inc-recursive" option. A remote attacker can can trick the victim into connecting to a rouge rsync server and write arbitrary files to arbitrary locations on the client system.


4) Path traversal (CVE-ID: CVE-2024-12088)

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote server to write files to arbitrary locations on the system.

The vulnerability exists due to input validation error when using "--safe-links" option. A remote attacker can can trick the victim into connecting to a rouge rsync server and write arbitrary files to arbitrary locations on the client system.

Remediation

Install update from vendor's website.

References