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CVE-2026-45185

Published: May 12, 2026Updated: May 28, 2026 Sources: CVE List NVD BDUCWE-416
NVD MITRE
9.8CVSSCRITICAL
EPSS Score
1.2%
Top 35.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

Exim before 4.99.3, in certain GnuTLS configurations, has a remotely reachable use-after-free in the BDAT body parsing path. It is triggered when a client sends a TLS close_notify mid-body during a CHUNKING transfer, followed by a final cleartext byte on the same TCP connection. This can lead to heap corruption. An unauthenticated network attacker exploiting this vulnerability could execute arbitrary code.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-416

Affected Products

EximExim
On-prem
Communications / email-server-client
eximexim
On-prem
Communications / email-server-client
eximGNU General Public LicenseOSS Libraries
eximoss-projectCommunications
gnu general public licenseoss-projectUSOSS Librariesaka gnu gpl, gpl

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://exim.org
exim.org
https://code.exim.org/exim/wiki/wiki/EximSecurity
code.exim.org
https://exim.org/static/doc/security/CVE-2026-45185.txt
exim.org
and 8 more references View all →

Timeline

Published
May 12, 2026
Last Updated
May 28, 2026

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