CVE-2026-101281

HIGHPre-NVD 7.37.3—
EchelonGraph scoreHIGH confidence

Score 7.3 from GitHub Security Advisory published 2026-09-29. A secondary CVSS source baseline 7.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 5 sources updated this weekElevated
7.3EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 7.3Exploit: Elevated riskExposed services: Not assessed

An upstream fix is merged but not yet released — mitigate (WAF / firewall / segmentation) until the release ships, then apply it.

A flaw has been found in Trusted Domain Project OpenDMARC up to 1.4.2. Affected by this vulnerability is the function opendmarc_sp2_find_mailfrom_domain of the file libopendmarc/opendmarc_spf.c of the component SPF Macro Handler. This manipulation causes improper authentication. The attack is possible to be carried out remotely. The exploit has been published and may be used. Patch name: c48a74c758677fc5272a73eff15ffdbf8afda1a6. Applying a patch is the recommended action to fix this issue.

CVSS v3
7.3
EG Score
7.3HIGHhigh confidence
EG Risk
64
EG Risk 64/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity73% × 45%
Exploitation40% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high until it ships, then apply the release.
EPSS PROB
0.4%
EPSS %ILE
32nd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high until it ships, then apply the release.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 29, 2026

Last Modified

October 1, 2026

Advisory Details (4)

Auto-updated Sep 29, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit, github_pr.
github_commit

commit c48a74c75867 (trusteddomainproject/OpenDMARC)

Fix landed in trusteddomainproject/OpenDMARC commit c48a74c75867 — awaiting tagged release

https://github.com/trusteddomainproject/OpenDMARC/commit/c48a74c758677fc5272a73eff15ffdbf8afda1a6
generic

OpenDMARC expands the SPF %{l} macro to "postmaster" for every sender, defeating per-user SPF policy [OpenDMARC ≤ 1.4.2, latest release checked 2026-07-30]

https://xuyongzhe-vt.github.io/share/opendmarc-spf-postmaster-macro.html
github_pr

Fix SPF regression from #262: set env_from before helo_dom

Fix merged in trusteddomainproject/OpenDMARC PR #328 on 2026-05-27 — awaiting tagged release

https://github.com/trusteddomainproject/OpenDMARC/pull/328
generic

Issues with vali.email SPF macros · Issue #262 · trusteddomainproject/OpenDMARC · GitHub

https://github.com/trusteddomainproject/OpenDMARC/issues/262

Vendor Advisories for CVE-2026-101281(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 31× in last 7d / 31× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-10-04 12:40 UTCGHSA enrichment
  2. 2026-10-04 01:20 UTCEG score recompute
  3. 2026-10-04 01:20 UTCGHSA enrichment
  4. 2026-10-03 14:25 UTCEPSS rescore
  5. 2026-10-03 13:59 UTCGHSA enrichment
  6. 2026-10-03 02:38 UTCEG score recompute
  7. 2026-10-03 02:38 UTCGHSA enrichment
  8. 2026-10-02 15:19 UTCGHSA enrichment
  9. 2026-10-02 03:58 UTCEG score recompute
  10. 2026-10-02 03:58 UTCGHSA enrichment
  11. 2026-10-01 19:49 UTCEPSS rescore
  12. 2026-10-01 16:39 UTCEG score recompute
  13. 2026-10-01 16:39 UTCGHSA enrichment
  14. 2026-10-01 16:24 UTCNVD updateCVSS v4 → 5.5
  15. 2026-10-01 15:41 UTCEG score recompute
  16. 2026-10-01 15:41 UTCGHSA enrichment
  17. 2026-10-01 15:40 UTCMITRE cvelistV5CVSS v4 → 6.9
  18. 2026-10-01 05:03 UTCGHSA enrichment
  19. 2026-09-30 17:44 UTCEG score recompute
  20. 2026-09-30 17:44 UTCGHSA enrichment
  21. 2026-09-30 15:02 UTCEPSS rescore
  22. 2026-09-30 06:25 UTCGHSA enrichment
  23. 2026-09-29 19:06 UTCEG score recompute
  24. 2026-09-29 19:06 UTCGHSA enrichment
  25. 2026-09-29 15:20 UTCEPSS rescore
Show 6 more
  1. 2026-09-29 12:39 UTCEG score recompute
  2. 2026-09-29 12:39 UTCGHSA enrichment
  3. 2026-09-29 01:20 UTCEG score recompute
  4. 2026-09-29 01:20 UTCNVD updateCVSS v4 → 5.5
  5. 2026-09-29 00:56 UTCEG score recompute
  6. 2026-09-29 00:56 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-101281?
CVE-2026-101281 is a high vulnerability published on September 29, 2026. A flaw has been found in Trusted Domain Project OpenDMARC up to 1.4.2. Affected by this vulnerability is the function opendmarcsp2findmailfromdomain of the file libopendmarc/opendmarc_spf.c of the component SPF Macro Handler. This manipulation causes improper authentication. The attack is possible…
When was CVE-2026-101281 disclosed?
CVE-2026-101281 was first published on September 29, 2026, with the most recent update on October 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-101281 actively exploited?
CVE-2026-101281 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (32nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-101281?
CVE-2026-101281 has a CVSS base score of 7.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-101281?
An upstream fix for CVE-2026-101281 has been merged but is not yet in a tagged release. Until it ships, restrict network exposure of the affected system or apply the vendor's mitigation, then update to the release that contains the fix. The vendor advisories EchelonGraph has for CVE-2026-101281 are linked in the Vendor Advisories panel on this page.

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