Logo
-

Byte Open Security

(ByteOS Network)

Log In

Sign Up

ByteOS

Security
Vulnerability Details
Registries
Custom Views
Weaknesses
Attack Patterns
Filters & Tools
Vulnerability Details :

CVE-2026-48840

Summary
Assigner-mitre
Assigner Org ID-8254265b-2729-46b6-b9e3-3dfca2d5bfca
Published At-30 May, 2026 | 01:50
Updated At-30 May, 2026 | 03:08
Rejected At-
Credits

Exim 4.88 before 4.99.4, in some proxy configurations, mishandles certain short payloads, leading to disclosure of uninitialized stack memory values to a client.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:mitre
Assigner Org ID:8254265b-2729-46b6-b9e3-3dfca2d5bfca
Published At:30 May, 2026 | 01:50
Updated At:30 May, 2026 | 03:08
Rejected At:
▼CVE Numbering Authority (CNA)

Exim 4.88 before 4.99.4, in some proxy configurations, mishandles certain short payloads, leading to disclosure of uninitialized stack memory values to a client.

Affected Products
Vendor
EximExim
Product
Exim
Repo
https://code.exim/org/exim/exim
Default Status
unaffected
Versions
Affected
  • From 4.88 before 4.99.4 (custom)
Problem Types
TypeCWE IDDescription
CWECWE-839CWE-839 Numeric Range Comparison Without Minimum Check
Type: CWE
CWE ID: CWE-839
Description: CWE-839 Numeric Range Comparison Without Minimum Check
Metrics
VersionBase scoreBase severityVector
3.15.3MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Version: 3.1
Base score: 5.3
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://exim.org/static/doc/security/EXIM-Security-2026-05-19.1
N/A
https://www.openwall.com/lists/oss-security/2026/05/29/3
N/A
Hyperlink: https://exim.org/static/doc/security/EXIM-Security-2026-05-19.1
Resource: N/A
Hyperlink: https://www.openwall.com/lists/oss-security/2026/05/29/3
Resource: N/A
▼Authorized Data Publishers (ADP)
CVE Program Container
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
http://www.openwall.com/lists/oss-security/2026/05/29/3
N/A
Hyperlink: http://www.openwall.com/lists/oss-security/2026/05/29/3
Resource: N/A
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:cve@mitre.org
Published At:30 May, 2026 | 02:16
Updated At:30 May, 2026 | 04:17

Exim 4.88 before 4.99.4, in some proxy configurations, mishandles certain short payloads, leading to disclosure of uninitialized stack memory values to a client.

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
Secondary3.15.3MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Type: Secondary
Version: 3.1
Base score: 5.3
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CPE Matches
Weaknesses
CWE IDTypeSource
CWE-839Secondarycve@mitre.org
CWE ID: CWE-839
Type: Secondary
Source: cve@mitre.org
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://exim.org/static/doc/security/EXIM-Security-2026-05-19.1cve@mitre.org
N/A
https://www.openwall.com/lists/oss-security/2026/05/29/3cve@mitre.org
N/A
http://www.openwall.com/lists/oss-security/2026/05/29/3af854a3a-2127-422b-91ae-364da2661108
N/A
Hyperlink: https://exim.org/static/doc/security/EXIM-Security-2026-05-19.1
Source: cve@mitre.org
Resource: N/A
Hyperlink: https://www.openwall.com/lists/oss-security/2026/05/29/3
Source: cve@mitre.org
Resource: N/A
Hyperlink: http://www.openwall.com/lists/oss-security/2026/05/29/3
Source: af854a3a-2127-422b-91ae-364da2661108
Resource: N/A

Change History

0
Information is not available yet

Similar CVEs

2Records found
CVE-2026-40686
Matching Score-8
Assigner-MITRE Corporation
ShareView Details
Matching Score-8
Assigner-MITRE Corporation
CVSS Score-3.7||LOW
EPSS-0.10% / 27.23%
||
7 Day CHG~0.00%
Published-30 Apr, 2026 | 00:00
Updated-01 May, 2026 | 17:44
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

In Exim before 4.99.2, when utf8 operators are enabled, there is an out-of-bounds read if large UTF-8 trailing characters are present (malformed UTF-8 header data). Information might be divulged within an error message produced during handling of an unrelated e-mail message.

Action-Not Available
Vendor-Exim
Product-eximExim
CWE ID-CWE-125
Out-of-bounds Read
CVE-2023-42114
Matching Score-8
Assigner-Zero Day Initiative
ShareView Details
Matching Score-8
Assigner-Zero Day Initiative
CVSS Score-3.7||LOW
EPSS-13.89% / 94.42%
||
7 Day CHG~0.00%
Published-03 May, 2024 | 02:13
Updated-04 Nov, 2025 | 20:16
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Exim NTLM Challenge Out-Of-Bounds Read Information Disclosure Vulnerability

Exim NTLM Challenge Out-Of-Bounds Read Information Disclosure Vulnerability. This vulnerability allows remote attackers to disclose sensitive information on affected installations of Exim. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of NTLM challenge requests. The issue results from the lack of proper validation of user-supplied data, which can result in a read past the end of an allocated data structure. An attacker can leverage this vulnerability to disclose information in the context of the service account. . Was ZDI-CAN-17433.

Action-Not Available
Vendor-Exim
Product-eximEximexim
CWE ID-CWE-125
Out-of-bounds Read
Details not found