Missing Release of Memory after Effective Lifetime Affecting freebsd package, versions [,14.3.0-p10)[14.4.0,14.4.0-p1)[15.0.0,15.0.0-p5)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-UNMANAGED-FREEBSD-15812210
- published29 Mar 2026
- disclosed26 Mar 2026
- creditMichael Tuexen
Introduced: 26 Mar 2026
CVE-2026-4247 (opens in a new tab)How to fix?
Upgrade freebsd to version 14.3.0-p10, 14.4.0-p1, 15.0.0-p5 or higher.
Overview
Affected versions of this package are vulnerable to Missing Release of Memory after Effective Lifetime in the tcp_respond function. An attacker can exhaust system memory by sending specially crafted TCP packets that trigger the allocation and leakage of mbufs beyond the configured challenge ACK rate limit. This can be performed by an attacker who is on-path with an established TCP connection or who can establish a TCP connection to the affected system. Off-path attackers may also exploit this by guessing connection parameters and spoofing packets, though this is more difficult.