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.
Metrics
Affected Vendors & Products
References
History
Sat, 02 May 2026 08:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Title | Exim Out-of-Bounds Heap Write in JSON Lookup |
Fri, 01 May 2026 18:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Weaknesses | CWE-787 |
Fri, 01 May 2026 15:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
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Fri, 01 May 2026 05:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Title | Exim Out-of-Bounds Heap Write in JSON Lookup |
Fri, 01 May 2026 02:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| References |
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Fri, 01 May 2026 02:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| References |
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Thu, 30 Apr 2026 21:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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. | |
| First Time appeared |
Exim
Exim exim |
|
| Weaknesses | CWE-684 | |
| CPEs | cpe:2.3:a:exim:exim:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Exim
Exim exim |
|
| References |
| |
| Metrics |
cvssV3_1
|
Status: PUBLISHED
Assigner: mitre
Published: 2026-04-30T00:00:00.000Z
Updated: 2026-05-01T14:26:41.873Z
Reserved: 2026-04-14T00:00:00.000Z
Link: CVE-2026-40685
Updated: 2026-05-01T14:26:38.069Z
Status : Analyzed
Published: 2026-04-30T22:16:25.633
Modified: 2026-05-01T17:51:06.830
Link: CVE-2026-40685
No data.
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