Trusted Domain Project OpenDKIM Decoder util.c dkim_qp_decode off-by-one

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-100889
StatePUBLISHED
AssignerVulDB
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-28 00:16:32 UTC
Updated2026-09-28 15:16:04 UTC
DescriptionA vulnerability was detected in Trusted Domain Project OpenDKIM up to 2.11.0. Affected is the function dkim_qp_decode of the file util.c of the component Decoder. The manipulation results in off-by-one. The attack may be performed from remote. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Risk And Classification

Primary CVSS: v4.0 5.5 MEDIUM from [email protected]

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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Problem Types: CWE-189 | CWE-193 | CWE-193 Off-by-One | CWE-189 Numeric Error

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary5.5MEDIUMCVSS: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/C...
4.0CNADECLARED6.9MEDIUMCVSS: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
3.1[email protected]Secondary7.3HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
3.1CNADECLARED7.3HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:C
3.0CNADECLARED7.3HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:C
2.0[email protected]Secondary7.5AV:N/AC:L/Au:N/C:P/I:P/A:P
2.0CNADECLARED7.5AV:N/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:ND/RC:C

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
Low
Integrity
Low
Availability
Low
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low

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

CVSS v3.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Trusted Domain Project OpenDKIM affected 2.0 Not specified
CNA Trusted Domain Project OpenDKIM affected 2.1 Not specified
CNA Trusted Domain Project OpenDKIM affected 2.2 Not specified
CNA Trusted Domain Project OpenDKIM affected 2.3 Not specified
CNA Trusted Domain Project OpenDKIM affected 2.4 Not specified
CNA Trusted Domain Project OpenDKIM affected 2.5 Not specified
CNA Trusted Domain Project OpenDKIM affected 2.6 Not specified
CNA Trusted Domain Project OpenDKIM affected 2.7 Not specified
CNA Trusted Domain Project OpenDKIM affected 2.8 Not specified
CNA Trusted Domain Project OpenDKIM affected 2.9 Not specified
CNA Trusted Domain Project OpenDKIM affected 2.10 Not specified
CNA Trusted Domain Project OpenDKIM affected 2.11.0 Not specified

References

ReferenceSourceLinkTags
vuldb.com/vuln/410839 [email protected] vuldb.com
vuldb.com/vuln/410839/cti [email protected] vuldb.com
weitongli.com/share/opendkim-qp-off-by-one.html [email protected] weitongli.com
vuldb.com/submit/917063 [email protected] vuldb.com
vuldb.com/cve/CVE-2026-100889 [email protected] vuldb.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: WeitongLi (VulDB User) (en)

CNA: VulDB CNA Team (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-09-27T00:00:00.000ZAdvisory disclosed
CNA2026-09-27T02:00:00.000ZVulDB entry created
CNA2026-09-27T09:41:07.000ZVulDB entry last update

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