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Vulnerability record · CVE-2026-66140 · published 24 July 2026

CVE-2026-66140: Exim vulnerability

Exim · Exim

Exim before 4.99.5 allows directory traversal to access files outside of the spool area, and consequently gain privileges, because arguments related to queue-name are mishandled.

7.8 CVSS 3.1 High EPSS 0.39% · top 69.9% CWE-24 · CWE-24
7.8CVSS 3.1 base score
0.39%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References
17 Aug 2026Last modified by NVD

Description

Exim before 4.99.5 allows directory traversal to access files outside of the spool area, and consequently gain privileges, because arguments related to queue-name are mishandled.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://openwall.com/lists/oss-security/2026/07/22/9 Mailing ListThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2019-16928Exim heap buffer overflow in string_vformat via long EHLO commandExim 4.92 through 4.92.2 contains a heap-based buffer overflow in string_vformat in string.c triggered by a long EHLO command, allowing remote code e…KEVEPSS 42%analysed9.8CVE-2019-10149Exim MTA improper recipient validation leads to remote command executionExim versions 4.87 through 4.91 fail to properly validate recipient addresses in the deliver_message() function in /src/deliver.c, allowing command i…KEVEPSS 100%analysed9.8CVE-2018-6789Exim SMTP base64d buffer overflow allows remote code executionExim before 4.90.1 contains a buffer overflow in the base64d function of its SMTP listener. A handcrafted message can trigger the overflow, and the f…KEVEPSS 82%analysed9.8CVE-2010-4344Exim SMTP heap buffer overflow enables remote code executionExim before 4.70 has a heap-based buffer overflow in string_vformat in string.c. A remote SMTP session that sends two MAIL commands plus a large mess…KEVEPSS 72%analysed7.8CVE-2010-4345Exim local privilege escalation via alternate config file command injectionExim 4.72 and earlier lets the exim user account specify an alternate configuration file whose directives can contain arbitrary commands, as shown wi…KEVEPSS 18%analysed9.8CVE-2026-45185Exim use after free vulnerabilityExim 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 c…EPSS 0.94%9.8CVE-2026-40685Exim out-of-bounds write vulnerabilityIn Exim before 4.99.2, when JSON lookup is enabled, an out-of-bounds heap write can occur when a JSON operator encounters malformed JSON in an untrus…EPSS 0.58%9.8CVE-2025-67896Exim heap-based buffer overflow vulnerabilityExim before 4.99.1, with certain non-default rate-limit configurations, allows a remote heap-based buffer overflow because database records are cast …EPSS 0.47%

Source: NIST National Vulnerability Database (record CVE-2026-66140), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.