Out-of-bounds Read in Earthscope Libmseed
CVE-2026-111158
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- hackmd.io/@haind-pwn/libmseed-ms3detect-short-header-oob-read (technical-description, exploit)
- github.com/EarthScope/libmseed/blob/d6e6ad306de5b7bdde072e5a5e3d58ddcc11abd8/pa… (technical-description)
- github.com/EarthScope/libmseed/commit/c93a36a1381e944b59b10967342ee1cb94304223 (patch)
- github.com/EarthScope/libmseed (product)
- www.vulncheck.com/advisories/earthscope-libmseed-through-3.5.4-heap-out-of-boun… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-111158?
- CVE-2026-111158 is a medium-severity vulnerability in Earthscope Libmseed, classified under Out-of-bounds Read. CVSS score: 5.5/10. Published 2026-10-15.
- How severe is CVE-2026-111158?
- Medium severity. CVSS v3 base score is 5.5 out of 10.