CVE-2026-45185

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Summary

CVECVE-2026-45185
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-12 20:16:46 UTC
Updated2026-05-12 21:16:16 UTC
DescriptionExim 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.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Problem Types: CWE-416 | CWE-416 CWE-416 Use After Free

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNACVSS9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Exim Exim affected 4.97 4.99.3 custom Not specified

References

ReferenceSourceLinkTags
news.ycombinator.com/item [email protected] news.ycombinator.com
exim.org/static/doc/security/CVE-2026-45185.txt [email protected] exim.org
code.exim.org/exim/wiki/wiki/EximSecurity [email protected] code.exim.org
xbow.com/blog/dead-letter-cve-2026-45185-xbow-found-rce-exim [email protected] xbow.com
exim.org/static/doc/security/EXIM-Security-2026-05-01.1 [email protected] exim.org
exim.org [email protected] exim.org
www.openwall.com/lists/oss-security/2026/05/12/4 [email protected] www.openwall.com
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