CVE-2026-40687

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• 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

0.37% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 30.3% of scored records. A rank, not a probability.

NVD base score

9.1 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

NVD analysis status

Analyzed. NVD last modified this record on 2026-06-17.

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

2026-04-30 00:00Z4 MO AGO

Last updated

2026-05-01 14:25Z4 MO AGO

Reserved

2026-04-14

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Medium (CVSS 4.8)

CNA CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L

Weaknesses

• CWE-909Missing Initialization of ResourceClass

Data version

5.2

Document digest

adc2a47e8b4191d89a2ef7b9488d3e1cf4ebff2708c115e74438ce8d0d2f2a82

• www.openwall.comhttps://www.openwall.com/lists/oss-security/2026/04/30/21
• exim.orghttps://exim.org/static/doc/security/cve-2026-04.1/CVE2026-40687.assessment
• code.exim.orghttps://code.exim.org/exim/exim/commit/68b963b9f75ca27b38e1c0f8c87037990199f505
• exim.orghttps://exim.org/static/doc/security/CVE-2026-40687.txt