CVE-2026-45185

Published: May 12, 2026Updated: May 28, 2026 Sources: CVE List NVD BDUCWE-416

9.8CRITICAL

NVD MITRE

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.

No summary for this CVE yet.

CVSS Vector Breakdown

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

Exim

oss-project

EximOn-prem

Communications / email-server-client

GNU General Public License

oss-project·USaka gpl, gnu gpl

exim

OSS Libraries

and 1 more affected products View all →

Exploitability

Official Patch Available

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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques

Initial Access

Privilege Escalation

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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 →

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