CVE-2026-101016

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory published 2026-09-28. A secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 5 sources updated this weekElevated
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 6.5Exploit: Elevated riskExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

A vulnerability has been found in Trusted Domain Project OpenDMARC up to 1.4.2. This affects the function opendmarc_policy_parse_dmarc in the library libopendmarc/opendmarc_policy.c. The manipulation of the argument fo/rf/ri/pct/sp/adkim/aspf/rua/ruf leads to handling of exceptional conditions. Remote exploitation of the attack is possible. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

CVSS v3
6.5
EG Score
6.5MEDIUMhigh confidence
EG Risk
60
EG Risk 60/100CISA 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
Severity65% × 45%
Exploitation40% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: No fix is confirmed yet. 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, and watch the vendor's advisory for the fix.
EPSS PROB
0.3%
EPSS %ILE
23rd
KEV
Not listed

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

No fix is confirmed yet. 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, and watch the vendor's advisory for the fix.

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 28, 2026

Last Modified

September 28, 2026

Advisory Details (1)

Auto-updated Sep 28, 2026
No patch confirmed yet.
generic

One bad character in a reporting-only DMARC tag makes OpenDMARC return permerror and stop enforcing the record's p=reject [OpenDMARC ≤ 1.4.2, latest release checked 2026-07-30]

https://xuyongzhe-vt.github.io/share/opendmarc-bad-tag-drops-policy.html

Vendor Advisories for CVE-2026-101016(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 28× in last 7d / 28× 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. 2026-10-03 23:21 UTCEG score recompute
  2. 2026-10-03 23:21 UTCGHSA enrichment
  3. 2026-10-03 14:25 UTCEPSS rescore
  4. 2026-10-02 21:50 UTCEG score recompute
  5. 2026-10-02 21:50 UTCGHSA enrichment
  6. 2026-10-01 20:20 UTCEG score recompute
  7. 2026-10-01 20:19 UTCGHSA enrichment
  8. 2026-10-01 19:49 UTCEPSS rescore
  9. 2026-09-30 18:47 UTCEG score recompute
  10. 2026-09-30 18:47 UTCGHSA enrichment
  11. 2026-09-30 15:02 UTCEPSS rescore
  12. 2026-09-29 17:01 UTCEG score recompute
  13. 2026-09-29 17:01 UTCGHSA enrichment
  14. 2026-09-29 15:20 UTCEPSS rescore
  15. 2026-09-28 15:28 UTCEG score recompute
  16. 2026-09-28 15:28 UTCGHSA enrichment
  17. 2026-09-28 13:50 UTCEPSS rescore
  18. 2026-09-28 11:29 UTCEG score recompute
  19. 2026-09-28 11:29 UTCGHSA enrichment
  20. 2026-09-28 11:29 UTCNVD updateCVSS v4 → 5.5
  21. 2026-09-28 11:03 UTCEG score recompute
  22. 2026-09-28 11:03 UTCGHSA enrichment
  23. 2026-09-28 11:02 UTCMITRE cvelistV5CVSS v4 → 6.9
  24. 2026-09-28 09:32 UTCEG score recompute
  25. 2026-09-28 09:32 UTCGHSA enrichment
Show 3 more
  1. 2026-09-28 09:31 UTCNVD updateCVSS v4 → 5.5
  2. 2026-09-28 08:57 UTCEG score recompute
  3. 2026-09-28 08:57 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-101016?
CVE-2026-101016 is a medium vulnerability published on September 28, 2026. A vulnerability has been found in Trusted Domain Project OpenDMARC up to 1.4.2. This affects the function opendmarcpolicyparsedmarc in the library libopendmarc/opendmarcpolicy.c. The manipulation of the argument fo/rf/ri/pct/sp/adkim/aspf/rua/ruf leads to handling of exceptional conditions. Remote…
When was CVE-2026-101016 disclosed?
CVE-2026-101016 was first published on September 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-101016 actively exploited?
CVE-2026-101016 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (23rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-101016?
CVE-2026-101016 has a CVSS base score of 6.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-101016?
No fix for CVE-2026-101016 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-101016 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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