CVE-2026-111158

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.12% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 2.4% of scored records. A rank, not a probability.

NVD base score

6.8 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

NVD analysis status

Deferred. NVD last modified this record on 2026-10-16.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-10-15 18:57Z13 DAYS AGO

Last updated

2026-10-15 19:42Z13 DAYS AGO

Reserved

2026-10-15

Assigning CNA

VulnCheck

Record state

PUBLISHED

Severity

Medium (CVSS 6.8)

CNA CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Weaknesses

• CWE-125Out-of-bounds ReadBase

Data version

5.2

Document digest

305236f3b88ad8ed22f23a3e1ff5496539f99e0e9eb616ede820ef8b348080a6

• hackmd.iohttps://hackmd.io/@haind-pwn/libmseed-ms3detect-short-header-oob-readtechnical-descriptionexploit
• github.comhttps://github.com/EarthScope/libmseed/blob/d6e6ad306de5b7bdde072e5a5e3d58ddcc11abd8/parseutils.c#L192-L234technical-description
• github.comhttps://github.com/EarthScope/libmseed/commit/c93a36a1381e944b59b10967342ee1cb94304223patch
• github.comhttps://github.com/EarthScope/libmseedproduct
• www.vulncheck.comVulnCheck Advisory: EarthScope libmseed through 3.5.4 Heap Out-of-Bounds Read via ms3_detecthttps://www.vulncheck.com/advisories/earthscope-libmseed-through-3.5.4-heap-out-of-bounds-read-via-ms3-detectthird-party-advisory