CVE-2026-101278

MEDIUMPre-NVD 4.34.3
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 4.3 from GitHub Security Advisory (severity: LOW) published 2026-09-29. A secondary CVSS source baseline 4.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Trending — 3 sources updated this weekElevated

Also known asEUVD-2026-88593 (ENISA EUVD) · GHSA-f9p6-hxqg-x7r4 (GitHub Security Advisories)Source: ENISA EUVD

4.3EG
EchelonGraph verdictPlan mitigationNo fix is confirmed yet: check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 4.3Exploit: No code on recordExposed services: Not assessed

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

The CVE record's description, written by its CNA (VulDB), states the affected versions: "A weakness has been identified in Trusted Domain Project OpenDMARC up to 1.4.2." No release containing a fix is confirmed on record.

A weakness has been identified in Trusted Domain Project OpenDMARC up to 1.4.2. This affects the function opendmarc_get_tld of the file libopendmarc/opendmarc_tld.c : of the component PSL Wildcard Handler. Executing a manipulation can lead to origin validation error. The attack may be launched remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

CVSS v3
4.3
EG Score
4.3MEDIUMmedium confidence
EG Risk
35
EG Risk 35/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity43% × 45%
Impact severity (EG Severity): CVSS 4.3 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: No fix is confirmed yet. Check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule.
EPSS PROB
0.1%
EPSS %ILE
2nd
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (4.3): severity, escalated by confirmed exploitation. This CVE's 4.3 is its impact severity (EG Severity), not escalated.

EG Severity
4.3 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.1% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-28). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says. In the directive's words, “Fix on system upgrade” means that, “unless conditions change”, the vulnerability “should be remediated the next time the vulnerable asset receives a scheduled major upgrade or rebuild”: its timelines are “dynamic as facts change”, and a KEV listing shortens them.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

No fix is confirmed yet. Check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says. In the directive's words, “Fix on system upgrade” means that, “unless conditions change”, the vulnerability “should be remediated the next time the vulnerable asset receives a scheduled major upgrade or rebuild”: its timelines are “dynamic as facts change”, and a KEV listing shortens them.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

September 29, 2026

Last Modified

October 1, 2026

Advisory Details (1)

Auto-updated Sep 29, 2026
No fix on record yet.
Web page

Under a Public Suffix List wildcard rule, OpenDMARC files every host beneath one tenant name into a single organization, so a rented instance can sign for its neighbor [OpenDMARC ≤ 1.4.2, latest release checked 2026-07-30]

https://xuyongzhe-vt.github.io/share/opendmarc-psl-wildcard-orgdomain.html

Vendor Advisories for CVE-2026-101278(1)

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

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
opendmarc1.4.2-2 ... 1.4.2-5.1 (7 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
opendmarc1.4.2-5, 1.4.2-5.1
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
opendmarc1.4.2-5, 1.4.2-5.1
  • every version on: no fix on record
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 54× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

  1. 2026-11-01 16:33 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  2. 2026-10-31 16:31 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  3. 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  4. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  5. 2026-10-29 03:32 UTCEG score recompute
  6. 2026-10-29 03:32 UTCGHSA enrichmentGHSA-f9p6-hxqg-x7r4 · GitHub severity LOW · GitHub CVSS 4.3
  7. 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  8. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  9. 2026-10-26 16:30 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  10. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  11. 2026-10-25 15:57 UTCEG score recompute
  12. 2026-10-24 16:31 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  13. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  14. 2026-10-23 09:45 UTCEG score recompute
  15. 2026-10-23 09:45 UTCGHSA enrichmentGHSA-f9p6-hxqg-x7r4 · GitHub severity LOW · GitHub CVSS 4.3
  16. 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  17. 2026-10-21 16:31 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  18. 2026-10-20 16:31 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  19. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  20. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  21. 2026-10-18 05:11 UTCEG score recompute
  22. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  23. 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  24. 2026-10-14 16:31 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  25. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
Show 48 more
  1. 2026-10-12 16:41 UTCEG score recompute
  2. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  3. 2026-10-11 20:16 UTCEG score recompute
  4. 2026-10-11 18:28 UTCEG score recompute
  5. 2026-10-11 15:02 UTCEG score recompute
  6. 2026-10-11 13:47 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  7. 2026-10-11 10:02 UTCEG score recompute
  8. 2026-10-11 10:02 UTCGHSA enrichmentGHSA-f9p6-hxqg-x7r4 · GitHub severity LOW · GitHub CVSS 4.3
  9. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  10. 2026-10-10 08:07 UTCEG score recompute
  11. 2026-10-10 08:06 UTCGHSA enrichmentGHSA-f9p6-hxqg-x7r4 · GitHub severity LOW · GitHub CVSS 4.3
  12. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  13. 2026-10-09 06:11 UTCEG score recompute
  14. 2026-10-09 06:11 UTCGHSA enrichmentGHSA-f9p6-hxqg-x7r4 · GitHub severity LOW · GitHub CVSS 4.3
  15. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  16. 2026-10-08 04:15 UTCEG score recompute
  17. 2026-10-08 04:15 UTCGHSA enrichmentGHSA-f9p6-hxqg-x7r4 · GitHub severity LOW · GitHub CVSS 4.3
  18. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  19. 2026-10-07 02:19 UTCEG score recompute
  20. 2026-10-07 02:19 UTCGHSA enrichmentGHSA-f9p6-hxqg-x7r4 · GitHub severity LOW · GitHub CVSS 4.3
  21. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  22. 2026-10-06 00:24 UTCEG score recompute
  23. 2026-10-06 00:23 UTCGHSA enrichmentGHSA-f9p6-hxqg-x7r4 · GitHub severity LOW · GitHub CVSS 4.3
  24. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  25. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  26. 2026-10-04 22:28 UTCGHSA enrichmentGHSA-f9p6-hxqg-x7r4 · GitHub severity LOW · GitHub CVSS 4.3
  27. 2026-10-03 20:33 UTCEG score recompute
  28. 2026-10-03 20:32 UTCGHSA enrichmentGHSA-f9p6-hxqg-x7r4 · GitHub severity LOW · GitHub CVSS 4.3
  29. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  30. 2026-10-02 18:37 UTCEG score recompute
  31. 2026-10-02 18:37 UTCGHSA enrichmentGHSA-f9p6-hxqg-x7r4 · GitHub severity LOW · GitHub CVSS 4.3
  32. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  33. 2026-10-01 16:40 UTCEG score recompute
  34. 2026-10-01 16:39 UTCGHSA enrichmentGHSA-f9p6-hxqg-x7r4 · GitHub severity LOW · GitHub CVSS 4.3
  35. 2026-10-01 16:24 UTCNVD updateCVSS v4 → 2.1
  36. 2026-10-01 15:26 UTCEG score recompute
  37. 2026-10-01 15:26 UTCGHSA enrichmentGHSA-f9p6-hxqg-x7r4 · GitHub severity LOW · GitHub CVSS 4.3
  38. 2026-10-01 15:25 UTCMITRE cvelistV5CVSS v4 → 5.3
  39. 2026-09-30 21:02 UTCEG score recompute
  40. 2026-09-30 21:01 UTCGHSA enrichmentGHSA-f9p6-hxqg-x7r4 · GitHub severity LOW · GitHub CVSS 4.3
  41. 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  42. 2026-09-29 19:06 UTCEG score recompute
  43. 2026-09-29 19:06 UTCGHSA enrichmentGHSA-f9p6-hxqg-x7r4 · GitHub severity LOW · GitHub CVSS 4.3
  44. 2026-09-29 15:20 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  45. 2026-09-29 01:20 UTCEG score recompute
  46. 2026-09-29 01:20 UTCNVD updateCVSS v4 → 2.1
  47. 2026-09-29 00:56 UTCEG score recomputeFirst assessed: 4.3 MEDIUM
  48. 2026-09-29 00:56 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-101278?
CVE-2026-101278 is a medium-severity vulnerability; its CVE record was published on September 29, 2026. A weakness has been identified in Trusted Domain Project OpenDMARC up to 1.4.2. This affects the function opendmarc_get_tld of the file libopendmarc/opendmarc_tld.c : of the component PSL Wildcard Handler. Executing a manipulation can lead to origin validation error. The attack may be launched…
When was the CVE record for CVE-2026-101278 published?
The CVE record for CVE-2026-101278 was published on September 29, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 1, 2026; the record at its source may have been updated since.
Is CVE-2026-101278 actively exploited?
CVE-2026-101278 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (2nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-101278?
CVE-2026-101278 has a CVSS base score of 4.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-101278?
No fix for CVE-2026-101278 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 CVE record's description, written by its CNA (VulDB), states the affected versions: "A weakness has been identified in Trusted Domain Project OpenDMARC up to 1.4.2." No release containing a fix is confirmed on record. The vendor advisories EchelonGraph has for CVE-2026-101278 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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