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CVE-2026-48840

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.

Published: May 30, 2026Updated: May 30, 2026 Sources: CVE List NVD
NVD MITRE
5.3CVSS
MEDIUM

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.

EPSS Score
0.0%
Top 91.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:LI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:NAvailability
None

Weaknesses

CWE-839

Affected Products

Exim
Exim

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

References

https://exim.org/static/doc/security/EXIM-Security-2026-05-19.1
exim.org
https://www.openwall.com/lists/oss-security/2026/05/29/3
openwall.com
http://www.openwall.com/lists/oss-security/2026/05/29/3
openwall.com

Timeline

Published
May 30, 2026
Last Updated
May 30, 2026

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