Trusted Domain Project OpenDKIM Decoder util.c dkim_qp_decode off-by-one
Priority HIGH 70CWE-189Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- —
- Confidentiality · integrity · availability
- Low · Low · Low
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA.
Summary
A 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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.003 22nd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Trusted Domain Project | OpenDKIM | 2.0; 2.1; 2.2; 2.3; 2.4; 2.5; 2.6; 2.7; 2.8; 2.9; 2.10; 2.11.0 | — | No fix listed | CNA |
- OpenDKIM VendorTrusted Domain Project Affected 2.0; 2.1; 2.2; 2.3; 2.4; 2.5; 2.6; 2.7; 2.8; 2.9; 2.10; 2.11.0 Fixed in — No fix listed CNA
CPE names CNA · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:trusted_domain_project:opendkim:*:*:*:*:*:*:*:* | — | — | Trusted Domain Project |
- cpe:2.3:a:trusted_domain_project:opendkim:*:*:*:*:*:*:*:* Versions — — ·Trusted Domain Project
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2026-100889
- 2026-10-03 Alias added: GHSA-87hw-mmxf-r6m3
References
More Trusted Domain Project vulnerabilities
- TI-2026-65175 Trusted Domain Project OpenDMARC SPF Macro opendmarc_spf.c opendmarc_sp2_find_mailfrom_domain improper authentication CVSS 4.0MEDIUM 6.9
- TI-2026-65174 Trusted Domain Project OpenDMARC Multi-Record Set opendmarc_policy_query_dmarc authentication spoofing CVSS 4.0MEDIUM 6.9
- TI-2026-65173 Trusted Domain Project OpenDMARC opendmarc_policy.c integer overflow CVSS 4.0MEDIUM 6.9
- TI-2026-65171 Trusted Domain Project OpenDKIM Tag Tokenizer dkim.c dkim_process_set less trusted source CVSS 4.0MEDIUM 6.9
- TI-2026-65064 Trusted Domain Project OpenDMARC opendmarc_policy.c strcasecmp exceptional condition CVSS 4.0MEDIUM 6.9
- TI-2026-65063 Trusted Domain Project OpenDMARC opendmarc_policy.c opendmarc_policy_parse_dmarc exceptional condition CVSS 4.0MEDIUM 6.9
Sources
- CVE-2026-100889 · CVE Program
- CVE-2026-100889 · NVD
- FIRST EPSS
- GHSA-87hw-mmxf-r6m3 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-100889 · Red Hat security data · CC BY 4.0
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