Bug 2569612 (CVE-2026-125403)

Summary: CVE-2026-125403 ettercap: ettercap: Memory corruption via Strict-Transport-Security header handling
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Ettercap. An out-of-bounds read and memory corruption vulnerability exists in its Secure Sockets Layer (SSL) interception feature. When Ettercap strips Strict-Transport-Security headers from intercepted web traffic, an improper length calculation can trigger an integer underflow. A malicious HTTPS server can exploit this by returning a crafted response, causing memory corruption and a potential Denial of Service (DoS) in the Ettercap process, which typically runs with root privileges.
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Description OSIDB Bzimport 2026-11-10 13:13:29 UTC 
Ettercap through 0.8.4.1 contains an out-of-bounds read and size_t underflow vulnerability in sslw_remove_sts() in src/ec_sslwrap.c, caused by a stale length and an unchecked memmem() result when stripping Strict-Transport-Security headers. A malicious HTTPS server whose response passes through Ettercap's SSL interception can trigger out-of-bounds reads and memory corruption in the Ettercap process, which normally runs as root.