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CVE-2026-45185

Quick assessment

Affected
Exim Exim
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Exim是Exim开源的一个运行于Unix系统中的开源消息传送代理（MTA），它主要负责邮件的路由、转发和投递。 Exim 4.99.3之前版本存在资源管理错误漏洞，该漏洞源于在特定GnuTLS配置下，BDAT主体解析路径中存在释放后重用，当客户端在CHUNKING传输期间发送TLS close_notify，随后在同一TCP连接上发送最终明文字节时触发，可能导致堆损坏，未经身份验证的网络攻击者利用此漏洞可执行任意代码。

CVSS 9.8 · Critical EPSS 0.94% · P60

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Exim Exim 4.97< 4.99.3 affected
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I. Basic Information for CVE-2026-45185

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
Exim 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Exim是Exim开源的一个运行于Unix系统中的开源消息传送代理（MTA），它主要负责邮件的路由、转发和投递。 Exim 4.99.3之前版本存在资源管理错误漏洞，该漏洞源于在特定GnuTLS配置下，BDAT主体解析路径中存在释放后重用，当客户端在CHUNKING传输期间发送TLS close_notify，随后在同一TCP连接上发送最终明文字节时触发，可能导致堆损坏，未经身份验证的网络攻击者利用此漏洞可执行任意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Exim Exim 4.97 ~ 4.99.3 -

II. Public POCs for CVE-2026-45185

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III. Intelligence Information for CVE-2026-45185

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Vendor Advisories for CVE-2026-45185 (3)

Mailing List Discussions for CVE-2026-45185 (1)

Security Blog Posts for CVE-2026-45185 (1)

News Coverage for CVE-2026-45185 (1)

Vendor Pages for CVE-2026-45185 (1)

IV. Related Vulnerabilities

Same product: Exim
Same vendor: Exim
Same weakness: CWE-416

V. Comments for CVE-2026-45185

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