Heap Out-of-Bounds Read Vulnerability in EarthScope libmseed
CVE-2026-111158

6.8MEDIUM

Key Information:

Vendor

Earthscope

Status
LIBMseed
Vendor
CVE Published:
15 October 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-111158?

EarthScope libmseed versions up to 3.5.4 are vulnerable to a heap out-of-bounds read issue in the ms3_detect() function located in parseutils.c. Exploitation of this vulnerability allows attackers to supply a buffer of 40 to 47 bytes, potentially leading to an over-read of up to 8 bytes beyond the allocated memory. This can result in unexpected behavior or even crashes in the process, highlighting the importance of proper buffer validation and error handling within the software.

Affected Version(s)

libmseed 0 <= 3.5.4

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-111158 - Proof of Concept

References

https://hackmd.io/@haind-pwn/libmseed-ms3detect-short-hea...
technical-descriptionexploit
https://github.com/EarthScope/libmseed/blob/d6e6ad306de5b...
technical-description
https://github.com/EarthScope/libmseed/commit/c93a36a1381...
patch

CVSS V4

Score:
6.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

HaiND from the Post and Telecommunication Institute of Technology
.