Is CVE-2026-111158 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-111158?

CVE-2026-111158 has a CVSS v3 severity of MEDIUM (5.5).

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CVE-2026-111158

Description

EarthScope libmseed through 3.5.4 contains a heap out-of-bounds read vulnerability in ms3_detect() in parseutils.c that reads past truncated miniSEED 2 record buffers. Attackers can supply a 40 to 47 byte buffer passing MS2_ISVALIDHEADER to msr3_parse() or ms3_detect(), over-reading up to 8 bytes and potentially crashing the process.