Length-Unchecked NEW_TOKEN in HAProxy 3.0-3.3.3 (incl. Enterprise & ALOHA)
CVE-2026-26081 Published on July 20, 2026
HAProxy Community Edition 3.0 through 3.3 before 3.3.3 lacks a length check for the NEW_TOKEN format. HAProxy Enterprise and ALOHA are also affected.
Vulnerability Analysis
CVE-2026-26081 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, with no impact on integrity and availability.
Weakness Type
What is a length manipulation Vulnerability?
The software parses a formatted message or structure, but it does not handle or incorrectly handles a length field that is inconsistent with the actual length of the associated data. If an attacker can manipulate the length parameter associated with an input such that it is inconsistent with the actual length of the input, this can be leveraged to cause the target application to behave in unexpected, and possibly, malicious ways. One of the possible motives for doing so is to pass in arbitrarily large input to the application. Another possible motivation is the modification of application state by including invalid data for subsequent properties of the application. Such weaknesses commonly lead to attacks such as buffer overflows and execution of arbitrary code.
CVE-2026-26081 has been classified to as a length manipulation vulnerability or weakness.
Products Associated with CVE-2026-26081
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Affected Versions
HAProxy:- Version 3.0 and below 3.0.12 is affected.
- Version 3.1 and below 3.1.14 is affected.
- Version 3.2 and below 3.2.12 is affected.
- Version 3.3 and below 3.3.3 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.