CVE-2026-103104
Executive Summary
CVE-2026-103104 is an improper input validation vulnerability in Pexip Infinity's media implementation that allows a remote, unauthenticated attacker to trigger a software abort, resulting in denial of service. All deployments running versions before 38.2, as well as 39.0, 39.1, and 40.0, are affected. Because the flaw requires no authentication or user interaction and is network-reachable, it poses a serious availability risk to enterprise video conferencing and real-time media infrastructure.
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Technical Analysis
The vulnerability resides in the media implementation of Pexip Infinity, a platform used for enterprise video conferencing, interoperability, and real-time media relay. Per the NVD description, the root cause is improper input validation: the software fails to correctly validate input processed by the media subsystem. When malformed or unexpected input reaches this component, it triggers a software abort — typically an assertion failure, unhandled exception, or explicit termination call — that crashes the affected process or service.
The associated weakness is CWE-617 (Reachable Assertion), which describes a condition where a reachable assertion can be triggered by an attacker. In this case, the assertion is reachable via network-delivered input to the media path, meaning an attacker who can send crafted traffic to the media endpoint can force the abort without any credentials.
Key characteristics:
- Attack vector: Network (AV:N)
- Attack complexity: Low (AC:L)
- Privileges required: None (PR:N)
- User interaction: None (UI:N)
- Scope: Unchanged (S:U)
- Confidentiality impact: None (C:N)
- Integrity impact: None (I:N)
- Availability impact: High (A:H)
The CVSS 3.1 base score of 7.5 reflects a high-availability impact with no confidentiality or integrity loss. The media implementation is inherently exposed to untrusted network input, since media streams must be accepted from remote participants and peer systems. This makes the attack surface broad: any host able to reach the media service can attempt to deliver the triggering input.
Because no public PoC, exploit code, or Nuclei template exists, the precise input pattern that triggers the assertion is not publicly documented. The analysis is therefore conducted at the vulnerability-class level: improper validation of media input leading to a reachable assertion and service abort. Specific parser functions, message formats, or protocol fields are not disclosed in the available data, and the report deliberately avoids inventing them.
It is important to note that Pexip Infinity deployments frequently sit at the edge of enterprise networks to enable external video conferencing, meaning the vulnerable media service may be directly reachable from the internet. This exposure elevates the practical risk even though the CVSS score is 7.5 rather than 9.0+; there is no need to elevate privileges or trick a user, only to reach the media endpoint.
Exploitation Scenarios
No public PoC is available; the attack chain below is inferred from the vulnerability class (improper input validation leading to a reachable assertion / software abort) and is described without fabricating specific implementation details.
Reconnaissance / target identification An attacker identifies internet-facing or network-reachable Pexip Infinity deployments. This can be done through Shodan-style queries for the product banner or TLS certificate, or through organizational knowledge that a target uses Pexip for video conferencing. The attacker confirms the version where possible, since versions before 38.2 and 39.0/39.1/40.0 are vulnerable.
Triggering the flaw class The attacker sends crafted input to the media implementation. Because the flaw is improper input validation, the input is malformed or unexpected relative to what the media subsystem expects. The subsystem fails to reject or sanitize it, reaching an assertion condition that has not been guarded.
Payload / execution method (vulnerability-class level) The payload is network-delivered input to the media service. No authentication, user interaction, or prior foothold is required. The exact byte sequence or protocol message is not published; the attacker would fuzz or craft inputs against the media endpoint to identify the abort condition. This is a classic availability attack rather than a code-execution attack: the goal is to reach the failing assertion.
Post-exploitation impact Upon reaching the assertion, the software aborts, terminating the affected process or service. This causes denial of service for legitimate users — conference sessions drop, media relay fails, and the service may need to be restarted. Depending on architecture and supervision, a crash could be repeated to maintain a sustained outage. There is no evidence that this flaw permits data exfiltration or code execution; the impact is strictly availability.
Impact Assessment
Business impact centers on availability of the Pexip Infinity media service. Organizations relying on Pexip for video conferencing, telehealth, distance learning, or inter-agency communications could experience dropped or failed sessions during an attack. Because the service is often externally reachable, a single remote attacker can disrupt operations without credentials.
Blast radius: any Pexip Infinity deployment running versions before 38.2, or 39.0, 39.1, or 40.0. Clustered or load-balanced deployments may mask a single node crash, but repeated triggering can degrade or exhaust capacity. The CVSS subscores (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) confirm a low-effort, remotely exploitable availability attack with high availability impact and no confidentiality/integrity impact.
Organizations with externally exposed media endpoints, those without robust rate limiting or supervision/auto-restart, and those using Pexip for critical communications are at greatest risk.
Detection Guidance
Sigma Rule
title: Pexip Infinity Media Input Validation DoS Attempt
id: 8f3c2b1a-4d5e-4f6a-9b7c-1e2d3f4a5b6c
status: experimental
description: Detects potential exploitation of CVE-2026-103104 via abnormal media service crashes or repeated abrupt process terminations on Pexip Infinity.
references:
- https://nvd.nist.gov/vuln/detail/CVE-2026-103104
author: Threat Intelligence
date: 2026/01/01
tags:
- attack.t1499
logsource:
product: linux
service: syslog
detection:
selection_service:
- 'pexip'
- 'infinity'
selection_crash:
- 'abort'
- 'assertion'
- 'core dumped'
- 'segfault'
- 'SIGABRT'
condition: selection_service and selection_crash
falsepositives:
- Legitimate service restarts and maintenance
- Unrelated application crashes with similar keywords
level: medium
YARA Rule
rule CVE_2026_103104_Pexip_Media_Abort
{
meta:
description = "Detects Pexip Infinity version strings associated with CVE-2026-103104"
author = "Threat Intelligence"
date = "2026-01-01"
reference = "https://nvd.nist.gov/vuln/detail/CVE-2026-103104"
severity = "high"
strings:
$prod = "Pexip Infinity" ascii wide nocase
$v38 = "38.1" ascii wide
$v39 = "39.0" ascii wide
$v391 = "39.1" ascii wide
$v40 = "40.0" ascii wide
condition:
$prod and any of ($v38, $v39, $v391, $v40)
}
Suricata IDS Rule
alert tcp any any -> any any (msg:"CVE-2026-103104 Pexip Infinity Media Input Validation DoS Attempt"; flow:to_server,established; content:"Pexip"; nocase; http_header; threshold: type both, track by_src, count 20, seconds 60; classtype:attempted-dos; reference:cve,2026-103104; sid:2026103104; rev:1;)
Elastic Detection
sequence by host.id with maxspan=5m
[process where process.name != null and process.args : "*pexip*"] by host.id
[process where event.action == "end" and process.exit_code != 0 and
(process.name : "*pexip*" or process.command_line : "*infinity*")]
Splunk SPL Query
index=* (sourcetype=syslog OR sourcetype=linux_secure OR source="*pexip*")
("Pexip" OR "Infinity")
("abort" OR "assertion" OR "SIGABRT" OR "core dumped" OR "segfault")
| stats count min(_time) as first_seen max(_time) as last_seen by host
| where count >= 3
| eval first_seen=strftime(first_seen,"%Y-%m-%d %H:%M:%S"), last_seen=strftime(last_seen,"%Y-%m-%d %H:%M:%S")
| sort - count
Wazuh OSSEC Rule
<group name="pexip,cve-2026-103104,">
<rule id="100310" level="10">
<decoded_as>syslog</decoded_as>
<match>Pexip|Infinity</match>
<regex>abort|assertion|SIGABRT|core dumped|segfault</regex>
<description>CVE-2026-103104: Potential Pexip Infinity media service abort / DoS condition detected</description>
<mitre>
<id>T1499</id>
</mitre>
<group>availability_impact,</group>
</rule>
</group>
Mitigation & Patch Guidance
Patch confidence: 0/4 (UNPATCHED — no patch evidence from any tracked source).
- Immediate mitigations
- Restrict network access to the Pexip Infinity media endpoints to trusted networks, peer systems, and expected peer IP ranges where operationally feasible.
- Apply rate limiting and connection throttling at the network edge and on the media service to make repeated triggering harder.
- Ensure process supervision and automatic restart are enabled so an aborted media process recovers quickly; monitor for rapid restart loops.
- Segment video conferencing infrastructure from general corporate networks to reduce the population of hosts that can reach the media service.
- Increase logging verbosity for the media subsystem and forward logs to the SIEM to catch abort/assertion events.
- Patch / upgrade steps
- There is no confirmed vendor patch in the available data. Monitor the vendor's advisory and release notes for fixed versions of Pexip Infinity (the affected range is before 38.2, plus 39.0, 39.1, and 40.0).
- When a fixed release becomes available, test it in a staging environment and upgrade all nodes/workers in the deployment, including any external-facing media nodes.
- Verify the version post-upgrade and confirm the media service operates normally.
- Long-term hardening
- Maintain a hardware/software inventory and vulnerability management process that flags Pexip Infinity versions against future CVEs.
- Adopt defense-in-depth for availability: redundant media nodes, health checks, and failover to preserve service during crashes.
- Conduct periodic fuzzing and input-validation review of media/media-relay components in-house or via trusted partners.
- Monitor CISA KEV and vendor advisories for exploit-in-the-wild evidence and adjust urgency accordingly. As of this report, CVE-2026-103104 is not in CISA KEV and no public PoC or exploit code is known.
References
- NVD — CVE-2026-103104: https://nvd.nist.gov/vuln/detail/CVE-2026-103104
- MITRE CWE-617 (Reachable Assertion): https://cwe.mitre.org/data/definitions/617.html
- MITRE ATT&CK T1499 (Endpoint Denial of Service): https://attack.mitre.org/techniques/T1499/
- Pexip Infinity documentation and security advisories (vendor release notes for Infinity 38.2 and later): https://docs.pexip.com/
- CISA Known Exploited Vulnerabilities Catalog (CVE-2026-103104 not listed at time of writing): https://www.cisa.gov/known-exploited-vulnerabilities-catalog
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