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.
History

Wed, 13 May 2026 15:45:00 +0000

Type Values Removed Values Added
References

Wed, 13 May 2026 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 13 May 2026 13:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Tue, 12 May 2026 22:15:00 +0000

Type Values Removed Values Added
Title Use‑After‑Free Leading to Remote Code Execution in BDAT Parsing of Exim

Tue, 12 May 2026 21:00:00 +0000

Type Values Removed Values Added
First Time appeared Exim
Exim exim
Weaknesses CWE-416
CPEs cpe:2.3:a:exim:exim:*:*:*:*:*:*:*:*
Vendors & Products Exim
Exim exim
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}


Tue, 12 May 2026 20:15:00 +0000

Type Values Removed Values Added
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.
References

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2026-05-12T00:00:00.000Z

Updated: 2026-05-13T13:31:31.294Z

Reserved: 2026-05-10T00:00:00.000Z

Link: CVE-2026-45185

cve-icon Vulnrichment

Updated: 2026-05-13T01:36:58.116Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-05-12T20:16:46.137

Modified: 2026-05-13T15:52:25.637

Link: CVE-2026-45185

cve-icon Redhat

No data.