CVE-2026-61915

HIGHNVD 7.17.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.1 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 82% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
7.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.1Exploit: None knownExposed: 0

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

An issue was discovered in Cyrus IMAP before 3.12.4. There is a VPATCH BYPARAM double-free. An authenticated calendar user could crash a Cyrus CalDAV worker with a PATCH containing PATCH-ACTION="BYPARAM@..." against a resource with two or more properties of the matched kind. The memory holding the selector would be freed once on each iteration over the properties.

CVSS v3
7.1
EG Score
7.1(medium)
EG Risk
32(Track)
EG Risk 32/100SSVC: Track

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
Severity71% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
18%
KEV
Not listed

Published

September 9, 2026

Last Modified

September 16, 2026

Advisory Details (4)

Auto-updated Sep 9, 2026
No patch confirmed yet.
generic

Cyrus IMAP 3.8.8 Release Notes — Cyrus IMAP 3.12.4 documentation

https://www.cyrusimap.org/3.12/imap/download/release-notes/3.8/x/3.8.8.html
generic

Cyrus IMAP 3.10.4 Release Notes — Cyrus IMAP 3.12.4 documentation

https://www.cyrusimap.org/3.12/imap/download/release-notes/3.10/x/3.10.4.html
generic

Cyrus IMAP 3.12.4 Release Notes — Cyrus IMAP 3.12.4 documentation

https://www.cyrusimap.org/3.12/imap/download/release-notes/3.12/x/3.12.4.html
generic

What is Cyrus IMAP? — Cyrus IMAP 3.12.4 documentation

https://cyrusimap.org

Vendor Advisories for CVE-2026-61915(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 22× in last 7d / 35× 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. 2026-09-19 22:18 UTCEG score recompute
  2. 2026-09-19 22:18 UTCGHSA enrichment
  3. 2026-09-19 09:49 UTCGHSA enrichment
  4. 2026-09-18 21:20 UTCEG score recompute
  5. 2026-09-18 21:20 UTCGHSA enrichment
  6. 2026-09-18 19:28 UTCEPSS rescore
  7. 2026-09-18 08:44 UTCGHSA enrichment
  8. 2026-09-17 20:16 UTCEG score recompute
  9. 2026-09-17 20:16 UTCGHSA enrichment
  10. 2026-09-17 04:11 UTCGHSA enrichment
  11. 2026-09-16 15:43 UTCEG score recompute▲ 2.90
  12. 2026-09-16 15:43 UTCGHSA enrichment
  13. 2026-09-16 15:43 UTCNVD updateCVSS v3 → 7.1 · severity → HIGH
  14. 2026-09-16 14:08 UTCEPSS rescore
  15. 2026-09-16 05:15 UTCEPSS rescore
  16. 2026-09-16 02:51 UTCGHSA enrichment
  17. 2026-09-15 04:57 UTCEG score recompute
  18. 2026-09-15 04:56 UTCGHSA enrichment
  19. 2026-09-14 06:58 UTCEG score recompute
  20. 2026-09-14 06:58 UTCGHSA enrichment
  21. 2026-09-13 09:04 UTCEG score recompute
  22. 2026-09-13 09:04 UTCGHSA enrichment
  23. 2026-09-12 11:11 UTCEG score recompute
  24. 2026-09-12 11:11 UTCGHSA enrichment
  25. 2026-09-11 14:53 UTCEPSS rescore
Show 10 more
  1. 2026-09-11 13:17 UTCEG score recompute
  2. 2026-09-11 13:17 UTCGHSA enrichment
  3. 2026-09-11 09:37 UTCEPSS rescore
  4. 2026-09-10 15:23 UTCEG score recompute
  5. 2026-09-10 15:23 UTCGHSA enrichment
  6. 2026-09-10 14:50 UTCEG score recompute
  7. 2026-09-10 14:50 UTCGHSA enrichment
  8. 2026-09-09 20:48 UTCEG score recompute
  9. 2026-09-09 20:10 UTCEG score recompute
  10. 2026-09-09 20:10 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-61915?
CVE-2026-61915 is a high vulnerability published on September 9, 2026. An issue was discovered in Cyrus IMAP before 3.12.4. There is a VPATCH BYPARAM double-free. An authenticated calendar user could crash a Cyrus CalDAV worker with a PATCH containing PATCH-ACTION="BYPARAM@..." against a resource with two or more properties of the matched kind. The memory holding the…
When was CVE-2026-61915 disclosed?
CVE-2026-61915 was first published in the National Vulnerability Database on September 9, 2026, with the most recent update on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-61915 actively exploited?
CVE-2026-61915 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 82.1% of all scored CVEs.
What is the CVSS score of CVE-2026-61915?
CVE-2026-61915 has a CVSS v3 base score of 7.1 (NVD).
How do I remediate CVE-2026-61915?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-61915, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-61915

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