CVE-2026-101279 Details
Description
A security vulnerability has been detected in Trusted Domain Project OpenDMARC up to 1.4.2. This impacts an unknown function of the file libopendmarc/opendmarc_policy.c of the component DMARC Parser. The manipulation of the argument pct leads to integer overflow. Remote exploitation of the attack is possible. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
A security vulnerability allowing remote exploitation has been identified in Trusted Domain Project OpenDMARC versions through 1.4.2. The issue arises in the DMARC Parser component, specifically within the file libopendmarc/opendmarc_policy.c. The vulnerability is caused by improper handling of the 'pct' argument, leading to an integer overflow. This flaw allows attackers to manipulate DMARC policies, potentially bypassing email authentication checks.
To address this vulnerability, 'pct' values should be parsed into a data type that can accommodate the full range of possible inputs without overflow. Implement range checks against 0 to 100 before any modular reductions, and on Rspamd, reject negative 'pct' values instead of clamping them to zero.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 29, 2026CISA-ADP
Assessed Sep 29, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://vuldb.com/cve/CVE-2026-101279 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/submit/918280 | [email protected] | Issue TrackingPermission Required |
| https://vuldb.com/vuln/411036 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/vuln/411036/cti | [email protected] | Content Wall |
| https://xuyongzhe-vt.github.io/share/dmarc-pct-integer-handling.html | [email protected] | Technical Analysis |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-189 | Numeric Errors | [email protected] |
| CWE-190 | Integer Overflow or Wraparound | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Trusted Domain Project OpenDMARC | <= 1.4.2 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 29, 2026 | CVE Modified | CISA-ADP |
| Sep 29, 2026 | New CVE Received | [email protected] |