CVE-2026-101281

HIGHPre-NVD 7.37.3
EchelonGraph scoreMEDIUM confidence

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

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, GitHub Security Advisory, a secondary CVSS source
Trending — 3 sources updated this weekElevated

Also known asEUVD-2026-88599 (ENISA EUVD) · GHSA-fvpv-g9f4-87fc (GitHub Security Advisories)Source: ENISA EUVD

7.3EG
EchelonGraph verdictPlan mitigationThe upstream fix is not in a release yet: until the release ships, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high, then apply it (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: 0.4%CVSS: 7.3Exploit: No code on recordExposed 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
7.3HIGHmedium confidence
EG Risk
64
EG Risk 64/100

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)
Severity73% × 45%
Impact severity (EG Severity): CVSS 7.3 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.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable yes (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: An upstream fix is merged but not yet in a tagged release. Until the release ships, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high, then apply it.
EPSS PROB
0.4%
EPSS %ILE
35th
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 (7.3): severity, escalated by confirmed exploitation. This CVE's 7.3 is its impact severity (EG Severity), not escalated.

EG Severity
7.3 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.4% 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; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days 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.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; Attend at high (mission-essential systems).

An upstream fix is merged but not yet in a tagged release. Until the release ships, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high, then apply it.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (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)14 days if the affected system is publicly exposed; 60 days 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.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (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 (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
Web page

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 pull request

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
Web page

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.

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(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 70× 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. 2026-11-02 16:43 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  2. 2026-11-01 16:33 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  3. 2026-10-31 16:31 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  4. 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  5. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  6. 2026-10-29 03:32 UTCEG score recompute
  7. 2026-10-29 03:32 UTCGHSA enrichmentGHSA-fvpv-g9f4-87fc · GitHub CVSS 7.3
  8. 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  9. 2026-10-27 19:33 UTCEG score recompute
  10. 2026-10-27 19:33 UTCGHSA enrichmentGHSA-fvpv-g9f4-87fc · GitHub CVSS 7.3
  11. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  12. 2026-10-26 16:30 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  13. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  14. 2026-10-25 15:57 UTCEG score recompute
  15. 2026-10-24 16:31 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  16. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  17. 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  18. 2026-10-21 16:31 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  19. 2026-10-20 19:16 UTCEG score recompute
  20. 2026-10-20 19:16 UTCGHSA enrichmentGHSA-fvpv-g9f4-87fc · GitHub CVSS 7.3
  21. 2026-10-20 16:31 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  22. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  23. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  24. 2026-10-18 05:11 UTCEG score recompute
  25. 2026-10-17 19:57 UTCEG score recompute
Show 73 more
  1. 2026-10-17 19:56 UTCGHSA enrichmentGHSA-fvpv-g9f4-87fc · GitHub CVSS 7.3
  2. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  3. 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  4. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  5. 2026-10-14 16:31 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  6. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  7. 2026-10-12 16:41 UTCEG score recompute
  8. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  9. 2026-10-12 03:28 UTCGHSA enrichmentGHSA-fvpv-g9f4-87fc · GitHub CVSS 7.3
  10. 2026-10-11 20:16 UTCEG score recompute
  11. 2026-10-11 18:28 UTCEG score recompute
  12. 2026-10-11 15:55 UTCGHSA enrichmentGHSA-fvpv-g9f4-87fc · GitHub CVSS 7.3
  13. 2026-10-11 15:02 UTCEG score recompute
  14. 2026-10-11 13:47 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  15. 2026-10-11 04:35 UTCEG score recompute
  16. 2026-10-11 04:35 UTCGHSA enrichmentGHSA-fvpv-g9f4-87fc · GitHub CVSS 7.3
  17. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  18. 2026-10-10 17:11 UTCGHSA enrichmentGHSA-fvpv-g9f4-87fc · GitHub CVSS 7.3
  19. 2026-10-10 05:51 UTCEG score recompute
  20. 2026-10-10 05:51 UTCGHSA enrichmentGHSA-fvpv-g9f4-87fc · GitHub CVSS 7.3
  21. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  22. 2026-10-09 18:31 UTCGHSA enrichmentGHSA-fvpv-g9f4-87fc · GitHub CVSS 7.3
  23. 2026-10-09 07:11 UTCGHSA enrichmentGHSA-fvpv-g9f4-87fc · GitHub CVSS 7.3
  24. 2026-10-08 19:51 UTCEG score recompute
  25. 2026-10-08 19:51 UTCGHSA enrichmentGHSA-fvpv-g9f4-87fc · GitHub CVSS 7.3
  26. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  27. 2026-10-08 07:21 UTCEG score recompute
  28. 2026-10-08 07:21 UTCGHSA enrichmentGHSA-fvpv-g9f4-87fc · GitHub CVSS 7.3
  29. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  30. 2026-10-07 20:02 UTCGHSA enrichmentGHSA-fvpv-g9f4-87fc · GitHub CVSS 7.3
  31. 2026-10-07 08:43 UTCGHSA enrichmentGHSA-fvpv-g9f4-87fc · GitHub CVSS 7.3
  32. 2026-10-06 21:23 UTCEG score recompute
  33. 2026-10-06 21:23 UTCGHSA enrichmentGHSA-fvpv-g9f4-87fc · GitHub CVSS 7.3
  34. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  35. 2026-10-06 10:04 UTCGHSA enrichmentGHSA-fvpv-g9f4-87fc · GitHub CVSS 7.3
  36. 2026-10-05 22:40 UTCEG score recompute
  37. 2026-10-05 22:39 UTCGHSA enrichmentGHSA-fvpv-g9f4-87fc · GitHub CVSS 7.3
  38. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  39. 2026-10-05 11:18 UTCGHSA enrichmentGHSA-fvpv-g9f4-87fc · GitHub CVSS 7.3
  40. 2026-10-04 23:59 UTCEG score recompute
  41. 2026-10-04 23:58 UTCGHSA enrichmentGHSA-fvpv-g9f4-87fc · GitHub CVSS 7.3
  42. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  43. 2026-10-04 12:40 UTCGHSA enrichmentGHSA-fvpv-g9f4-87fc · GitHub CVSS 7.3
  44. 2026-10-04 01:20 UTCEG score recompute
  45. 2026-10-04 01:20 UTCGHSA enrichmentGHSA-fvpv-g9f4-87fc · GitHub CVSS 7.3
  46. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  47. 2026-10-03 13:59 UTCGHSA enrichmentGHSA-fvpv-g9f4-87fc · GitHub CVSS 7.3
  48. 2026-10-03 02:38 UTCEG score recompute
  49. 2026-10-03 02:38 UTCGHSA enrichmentGHSA-fvpv-g9f4-87fc · GitHub CVSS 7.3
  50. 2026-10-02 15:19 UTCGHSA enrichmentGHSA-fvpv-g9f4-87fc · GitHub CVSS 7.3
  51. 2026-10-02 03:58 UTCEG score recompute
  52. 2026-10-02 03:58 UTCGHSA enrichmentGHSA-fvpv-g9f4-87fc · GitHub CVSS 7.3
  53. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  54. 2026-10-01 16:39 UTCEG score recompute
  55. 2026-10-01 16:39 UTCGHSA enrichmentGHSA-fvpv-g9f4-87fc · GitHub CVSS 7.3
  56. 2026-10-01 16:24 UTCNVD updateCVSS v4 → 5.5
  57. 2026-10-01 15:41 UTCEG score recompute
  58. 2026-10-01 15:41 UTCGHSA enrichmentGHSA-fvpv-g9f4-87fc · GitHub CVSS 7.3
  59. 2026-10-01 15:40 UTCMITRE cvelistV5CVSS v4 → 6.9
  60. 2026-10-01 05:03 UTCGHSA enrichmentGHSA-fvpv-g9f4-87fc · GitHub CVSS 7.3
  61. 2026-09-30 17:44 UTCEG score recompute
  62. 2026-09-30 17:44 UTCGHSA enrichmentGHSA-fvpv-g9f4-87fc · GitHub CVSS 7.3
  63. 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  64. 2026-09-30 06:25 UTCGHSA enrichmentGHSA-fvpv-g9f4-87fc · GitHub CVSS 7.3
  65. 2026-09-29 19:06 UTCEG score recompute
  66. 2026-09-29 19:06 UTCGHSA enrichmentGHSA-fvpv-g9f4-87fc · GitHub CVSS 7.3
  67. 2026-09-29 15:20 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  68. 2026-09-29 12:39 UTCEG score recompute
  69. 2026-09-29 12:39 UTCGHSA enrichmentGHSA-fvpv-g9f4-87fc · GitHub CVSS 7.3
  70. 2026-09-29 01:20 UTCEG score recompute
  71. 2026-09-29 01:20 UTCNVD updateCVSS v4 → 5.5
  72. 2026-09-29 00:56 UTCEG score recomputeFirst assessed: 7.3 HIGH
  73. 2026-09-29 00:56 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-101281?
CVE-2026-101281 is a high-severity vulnerability; its CVE record was 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 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…
When was the CVE record for CVE-2026-101281 published?
The CVE record for CVE-2026-101281 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-2026-101281 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 (35th 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.

Dependency Blast Radius

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