CVE-2026-100888
Trusted Domain Project OpenDKIM DKIM Signature Header Selection dkim-canon.c dkim_canon_selecthdrs out-of-bounds write
- State
- Published
- Severity
- 6.9 Medium
- Published
- Sep 27, 2026
- Updated
- Sep 30, 2026
- Reserved
- Sep 27, 2026
Description
A weakness has been identified in Trusted Domain Project OpenDKIM up to 2.11.0. This affects the function dkim_canon_selecthdrs of the file libopendkim/dkim-canon.c of the component DKIM Signature Header Selection. Executing a manipulation of the argument h can lead to out-of-bounds write. The attack can be executed remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.9 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P | VulDB |
| 3.1 | 7.3 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:C | VulDB |
| 3.0 | 7.3 High | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:C | VulDB |
| 2.0 | 7.5 High | AV:N/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:ND/RC:C | VulDB |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
OpenDKIMTrusted Domain Project |
|
References
- VDB-410837 | Trusted Domain Project OpenDKIM DKIM Signature Header Selection dkim-canon.c dkim_canon_selecthdrs out-of-bounds writevdb-entrytechnical-description
- VDB-410837 | CTI Indicators (IOB, IOC, IOA)signaturepermissions-required
- CVE-2026-100888 | CVE Analysis and Reportthird-party-advisory
- Submit #917015 | The Trusted Domain Project OpenDKIM 2.11.0 Out-of-bounds Writethird-party-advisory
- https://weitongli.com/share/opendkim-h-tag-oob-write.htmlexploit
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