CVE-2026-40685

In 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 untrusted header, because of an incorrect implementation of \ skipping...

CVE-2026-40686: Out-of-bounds Read

In Exim before 4.99.2, when utf8 operators are enabled, there is an out-of-bounds read if large UTF-8 trailing characters are present malformed UTF-8 header data. Information might be divulged within an error message produced during handling of an unrelated e-mail message...

Exim buffer error vulnerability

Exim is an open-source message transfer agent MTA developed by Exim Software. It operates on Unix-based systems and is primarily responsible for routing, forwarding, and delivering emails. Prior to Exim 4.99.2, there was a buffer error vulnerability. This vulnerability stemmed from the JSON...

CVE-2026-40685

In 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 untrusted header, because of an incorrect implementation of \ skipping...

CVE-2026-40685

In 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 untrusted header, because of an incorrect implementation of \ skipping...

CVE-2026-40685: Incorrect Provision of Specified Functionality

In 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 untrusted header, because of an incorrect implementation of \ skipping...

CVE-2026-40687

CVE-2026-40687 affects Exim before 4.99.2. When the SPA authentication driver is used with an adversarial SPA resource, an out-of-bounds write can crash the connection instance, or erroneous data processing can divulge data from uninitialized heap memory. Connected sources consistently describe t...

CVE-2026-40687

In Exim before 4.99.2, when the SPA authentication driver is used with an adversarial SPA resource, there can be an out-of-bounds write that crashes the connection instance, or erroneous data processing that divulges data from uninitialized heap memory...

CVE-2026-40684

In Exim before 4.99.2, on systems using musl libc not glibc, an attacker can crash the connection instance when malformed DNS data is present in PTR records. This is caused by a dnexpand oddity in octal printing...

CVE-2026-40684

In Exim before 4.99.2, on systems using musl libc not glibc, an attacker can crash the connection instance when malformed DNS data is present in PTR records. This is caused by a dnexpand oddity in octal printing...

CVE-2026-40684

In Exim before 4.99.2, on systems using musl libc (not glibc), a vulnerability can crash the connection instance when malformed DNS PTR data is present. The issue arises from a dn_expand octal printing oddity in the handling of PTR records, as described in multiple sources. Affected software/comp...

CVE-2026-40687: Missing Initialization of Resource

In Exim before 4.99.2, when the SPA authentication driver is used with an adversarial SPA resource, there can be an out-of-bounds write that crashes the connection instance, or erroneous data processing that divulges data from uninitialized heap memory...

Exim security vulnerabilities

Exim is an open-source message transfer agent MTA developed by Exim Software, running on Unix systems. It primarily handles the routing, forwarding, and delivery of emails. Versions of Exim prior to 4.99.2 contained security vulnerabilities. These vulnerabilities stemmed from the SPA authenticati...

CVE-2026-40687

In Exim before 4.99.2, when the SPA authentication driver is used with an adversarial SPA resource, there can be an out-of-bounds write that crashes the connection instance, or erroneous data processing that divulges data from uninitialized heap memory...

CVE-2026-40686

In Exim before 4.99.2, when utf8 operators are enabled, there is an out-of-bounds read if large UTF-8 trailing characters are present malformed UTF-8 header data. Information might be divulged within an error message produced during handling of an unrelated e-mail message...

Exim buffer error vulnerability

Exim is an open-source message transfer agent MTA developed by Exim Software, running on Unix systems. It primarily handles the routing, forwarding, and delivery of emails. Versions of Exim prior to 4.99.2 contained a buffer error vulnerability. This vulnerability stemmed from the utf8 operator’s...

CVE-2026-40686

In Exim before 4.99.2, when utf8 operators are enabled, there is an out-of-bounds read if large UTF-8 trailing characters are present malformed UTF-8 header data. Information might be divulged within an error message produced during handling of an unrelated e-mail message...

Exim security vulnerabilities

Exim is an open-source message transfer agent MTA developed by Exim Foundation and running on Unix systems. It primarily handles the routing, forwarding, and delivery of emails. Prior to Exim 4.99.2, there was a security vulnerability. This vulnerability occurred due to an exception in the octal...

CVE-2026-40686

CVE-2026-40686 affects Exim before 4.99.2 when utf8 operators are enabled. The vulnerability is an out-of-bounds read triggered by large UTF-8 trailing characters in malformed UTF-8 header data, with the potential for information disclosure via an error message produced during handling of an unre...

CVE-2026-40686

In Exim before 4.99.2, when utf8 operators are enabled, there is an out-of-bounds read if large UTF-8 trailing characters are present malformed UTF-8 header data. Information might be divulged within an error message produced during handling of an unrelated e-mail message...