VDB
CVE-2026-40686
CVE-2026-40686
PUBLISHED
CVSS 3.700000047683716 LOW
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.
EPSS 0.11% · 28.6th percentile
Risk Scores
CVSS v3.1
3.700000047683716
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
EPSS Score
0.11%
28.6th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| exim | exim | 0 |
| Exim | Exim | 0 |
Timeline
- Apr 30, 2026 CVE Published
- Apr 30, 2026 PoC Published
- May 1, 2026 Security Advisory
- May 1, 2026 CVE Updated
- May 18, 2026 EPSS Score
- May 19, 2026 EPSS Score
- May 20, 2026 EPSS Score
- May 21, 2026 EPSS Score
- May 22, 2026 EPSS Score
- May 23, 2026 EPSS Score
- May 24, 2026 EPSS Score
- May 25, 2026 EPSS Score
References
- https://www.exim.org/static/doc/security/cve-2026-04.1/ advisory
- https://exim.org/static/doc/security/CVE-2025-40686.txt url
- https://www.openwall.com/lists/oss-security/2026/04/30/21 url
- https://exim.org/static/doc/security/cve-2026-04.1/CVE2026-40686.assessment url
- https://code.exim.org/exim/exim/commit/f2570bde16fb4d4a1242ff363a4c4eecf6372efc url