Logo
-

Byte Open Security

(ByteOS Network)

Log In

Sign Up

ByteOS

Security
Vulnerability Details
Registries
Custom Views
Weaknesses
Attack Patterns
Filters & Tools
NVD Vulnerability Details :
CVE-2026-40687
Analyzed
More InfoOfficial Page
Source-cve@mitre.org
View Known Exploited Vulnerability (KEV) details
Published At-30 Apr, 2026 | 22:16
Updated At-01 May, 2026 | 19:17

In Exim before 4.99.2, when the SPA authentication driver is used with an adversarial SPA resource, there can be an out-of-bounds write that crashes the connection instance, or erroneous data processing that divulges data from uninitialized heap memory.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.14.8MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
Primary3.19.1CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Type: Secondary
Version: 3.1
Base score: 4.8
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
Type: Primary
Version: 3.1
Base score: 9.1
Base severity: CRITICAL
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
CPE Matches
Exim
exim
>>exim>>Versions before 4.99.2(exclusive)
cpe:2.3:a:exim:exim:*:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-909Secondarycve@mitre.org
CWE ID: CWE-909
Type: Secondary
Source: cve@mitre.org
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://code.exim.org/exim/exim/commit/68b963b9f75ca27b38e1c0f8c87037990199f505cve@mitre.org
Patch
https://exim.org/static/doc/security/CVE-2026-40687.txtcve@mitre.org
Broken Link
https://exim.org/static/doc/security/cve-2026-04.1/CVE2026-40687.assessmentcve@mitre.org
Vendor Advisory
https://www.openwall.com/lists/oss-security/2026/04/30/21cve@mitre.org
Mailing List
Third Party Advisory
Hyperlink: https://code.exim.org/exim/exim/commit/68b963b9f75ca27b38e1c0f8c87037990199f505
Source: cve@mitre.org
Resource:
Patch
Hyperlink: https://exim.org/static/doc/security/CVE-2026-40687.txt
Source: cve@mitre.org
Resource:
Broken Link
Hyperlink: https://exim.org/static/doc/security/cve-2026-04.1/CVE2026-40687.assessment
Source: cve@mitre.org
Resource:
Vendor Advisory
Hyperlink: https://www.openwall.com/lists/oss-security/2026/04/30/21
Source: cve@mitre.org
Resource:
Mailing List
Third Party Advisory
Change History
0Changes found
Details not found