CVE-2026-54135
HighCVSS 7.5Exploitation Probability (EPSS)
Elevated risk54th percentile - higher than 54% of all known CVEs
Summary
AirSane versions prior to 0.4.12 have a vulnerability in the custom HTTP server implementation that allows a remote unauthenticated attacker to cause a Denial of Service (DoS) via memory exhaustion. The HttpServer::Request::content function reads the Content-Length header and passes it directly to std::string::resize() without upper-bound validation, causing allocation of gigabytes of memory and process crash. Additionally, non-numeric characters in the Content-Length header lead to undefined behavior.
Risk Assessment
An attacker can remotely and without authentication crash the AirSane service, preventing scanner use. Repeated attacks can persistently disrupt service availability.
Recommendation
Update AirSane to version 0.4.12 or later. Until patched, consider restricting access to the service via firewall or proxy-level authentication.
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Original NVD description (English source)
AirSane is a SANE frontend, and a scanner server that supports Apple's AirScan protocol. Versions prior to 0.4.12 have a vulnerability in the custom HTTP server implementation of AirSane that allows a remote unauthenticated attacker to cause a Denial of Service (DoS) via memory exhaustion (OOM). In httpserver.cpp, the HttpServer::Request::content function reads the Content-Length header and directly passes this value to std::string::resize() without any upper-bound validation or safe parsing. An attacker can send an HTTP POST request with an artificially large Content-Length value. This forces the daemon to attempt allocating gigabytes of memory, resulting in a std::bad_alloc exception and immediately crashing the AirSane process. Additionally, providing non-numeric characters in the Content-Length header leads to undefined behavior (NaN to integer conversion) due to the lack of error handling during header parsing. Version 0.4.12 patches the issue.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

