CVE-2026-27856

HIGHNVD 5.97.4▲
EchelonGraph scoreMEDIUM confidence

Score 7.4 from GitHub Security Advisory (severity: HIGH) published 2026-03-27. NVD baseline CVSS 5.9; sources differ by 1.5.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.9Exploit: None knownExposed: 0

A fix is available — apply it.

Doveadm credentials are verified using direct comparison which is susceptible to timing oracle attack. An attacker can use this to determine the configured credentials. Figuring out the credential will lead into full access to the affected component. Limit access to the doveadm http service port, install fixed version. No publicly available exploits are known.

CVSS v3
5.9
EG Score
7.4(medium)
EG Risk
33(Track)
EG Risk 33/100SSVC: 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
Severity74% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
33%
KEV
Not listed

Published

March 27, 2026

Last Modified

July 15, 2026

Advisory Details (1)

Auto-updated Apr 29, 2026
No patch confirmed yet.
generic
https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json

Vendor Advisories for CVE-2026-27856(2)

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

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatdovecot-1:2.2.36-8.el7_9.12026-06-17redhat
ubuntudovecot-submissiond (1:2.4.1+dfsg1-5ubuntu4.1) @ questing2026-06-11ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(6 across 6 ecosystems)
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
dovecot—2.4.3-r0—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
dovecot—2.4.3-r0—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
dovecot1:2.3.13+dfsg1-2, 1:2.3.13+dfsg1-2+deb11u1, 1:2.3.13+dfsg1-2+deb11u21:2.3.13+dfsg1-2+deb11u3—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
dovecot1:2.3.19.1+dfsg1-2.1, 1:2.3.19.1+dfsg1-2.1+deb12u11:2.3.19.1+dfsg1-2.1+deb12u2—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
dovecot1:2.4.1+dfsg1-6, 1:2.4.1+dfsg1-6+deb13u1, 1:2.4.1+dfsg1-6+deb13u2, 1:2.4.1+dfsg1-6+deb13u31:2.4.1+dfsg1-6+deb13u4—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
dovecot1:2.4.1+dfsg1-6 ... 1:2.4.2+dfsg1-4 (8 versions)1:2.4.3+dfsg1-1—

Weakness Classification(2)

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

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 6× 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.

Showing the most recent 100 of 233 total refreshes for this CVE.

  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 19:27 UTCEPSS rescore
  3. 2026-09-17 19:30 UTCEPSS rescore
  4. 2026-09-16 14:08 UTCEPSS rescore
  5. 2026-09-16 05:15 UTCEPSS rescore
  6. 2026-09-13 16:47 UTCEPSS rescore
  7. 2026-09-12 15:01 UTCEPSS rescore
  8. 2026-09-11 14:52 UTCEPSS rescore
  9. 2026-09-10 09:34 UTCEPSS rescore
  10. 2026-09-08 22:00 UTCEPSS rescore
  11. 2026-09-07 16:01 UTCEPSS rescore
  12. 2026-09-06 13:47 UTCEPSS rescore
  13. 2026-09-06 13:47 UTCEPSS rescore
  14. 2026-09-04 05:06 UTCEPSS rescore
  15. 2026-09-02 14:11 UTCEPSS rescore
  16. 2026-09-02 13:14 UTCOSV refresh
  17. 2026-09-01 13:53 UTCEPSS rescore
  18. 2026-09-01 04:39 UTCEPSS rescore
  19. 2026-09-01 04:39 UTCEPSS rescore
  20. 2026-08-30 19:17 UTCEPSS rescore
  21. 2026-08-30 01:22 UTCEPSS rescore
  22. 2026-08-28 21:41 UTCEPSS rescore
  23. 2026-08-27 14:25 UTCEPSS rescore
  24. 2026-08-26 14:46 UTCEPSS rescore
  25. 2026-08-25 13:48 UTCEPSS rescore
Show 75 more
  1. 2026-08-23 00:19 UTCEPSS rescore
  2. 2026-08-21 23:49 UTCEPSS rescore
  3. 2026-08-20 22:55 UTCEPSS rescore
  4. 2026-08-19 17:03 UTCEPSS rescore
  5. 2026-08-18 13:48 UTCEPSS rescore
  6. 2026-08-17 13:47 UTCEPSS rescore
  7. 2026-08-16 14:56 UTCEPSS rescore
  8. 2026-08-16 10:02 UTCEG score recompute
  9. 2026-08-16 10:02 UTCVendor advisory
  10. 2026-08-16 10:02 UTCGHSA enrichment
  11. 2026-08-16 02:14 UTCEPSS rescore
  12. 2026-08-15 01:30 UTCEPSS rescore
  13. 2026-08-14 19:13 UTCVendor advisory
  14. 2026-08-14 19:13 UTCGHSA enrichment
  15. 2026-08-14 06:20 UTCEG score recompute
  16. 2026-08-14 06:20 UTCVendor advisory
  17. 2026-08-14 06:20 UTCGHSA enrichment
  18. 2026-08-13 22:00 UTCEPSS rescore
  19. 2026-08-12 20:38 UTCEG score recompute
  20. 2026-08-12 20:38 UTCVendor advisory
  21. 2026-08-12 20:38 UTCGHSA enrichment
  22. 2026-08-12 13:50 UTCEPSS rescore
  23. 2026-08-11 20:46 UTCEG score recompute
  24. 2026-08-11 20:46 UTCVendor advisory
  25. 2026-08-11 20:46 UTCGHSA enrichment
  26. 2026-08-11 13:42 UTCEPSS rescore
  27. 2026-08-11 03:48 UTCEG score recompute
  28. 2026-08-11 03:48 UTCVendor advisory
  29. 2026-08-11 03:48 UTCGHSA enrichment
  30. 2026-08-11 00:00 UTCEPSS rescore
  31. 2026-08-10 05:28 UTCVendor advisory
  32. 2026-08-10 05:28 UTCGHSA enrichment
  33. 2026-08-09 17:40 UTCEG score recompute
  34. 2026-08-09 17:40 UTCVendor advisory
  35. 2026-08-09 17:40 UTCGHSA enrichment
  36. 2026-08-09 13:46 UTCEPSS rescore
  37. 2026-08-09 05:53 UTCEG score recompute
  38. 2026-08-09 05:53 UTCVendor advisory
  39. 2026-08-09 05:53 UTCGHSA enrichment
  40. 2026-08-08 16:37 UTCEPSS rescore
  41. 2026-08-08 04:08 UTCEG score recompute
  42. 2026-08-08 04:08 UTCVendor advisory
  43. 2026-08-08 04:08 UTCGHSA enrichment
  44. 2026-08-07 16:21 UTCVendor advisory
  45. 2026-08-07 16:20 UTCGHSA enrichment
  46. 2026-08-06 18:43 UTCEG score recompute
  47. 2026-08-06 18:43 UTCVendor advisory
  48. 2026-08-06 18:43 UTCGHSA enrichment
  49. 2026-08-06 13:46 UTCEPSS rescore
  50. 2026-08-06 00:48 UTCEG score recompute
  51. 2026-08-06 00:48 UTCVendor advisory
  52. 2026-08-06 00:48 UTCGHSA enrichment
  53. 2026-08-05 19:17 UTCEPSS rescore
  54. 2026-08-04 15:10 UTCEPSS rescore
  55. 2026-08-03 23:09 UTCEG score recompute
  56. 2026-08-03 23:09 UTCVendor advisory
  57. 2026-08-03 23:09 UTCGHSA enrichment
  58. 2026-08-03 10:36 UTCEPSS rescore
  59. 2026-08-03 03:00 UTCVendor advisory
  60. 2026-08-03 03:00 UTCGHSA enrichment
  61. 2026-08-02 15:13 UTCEG score recompute
  62. 2026-08-02 15:13 UTCVendor advisory
  63. 2026-08-02 15:13 UTCGHSA enrichment
  64. 2026-08-02 02:26 UTCEPSS rescore
  65. 2026-08-01 04:16 UTCEPSS rescore
  66. 2026-07-30 16:27 UTCEPSS rescore
  67. 2026-07-30 01:30 UTCEPSS rescore
  68. 2026-07-28 15:36 UTCEPSS rescore
  69. 2026-07-26 14:54 UTCEPSS rescore
  70. 2026-07-26 14:54 UTCEPSS rescore
  71. 2026-07-25 14:18 UTCEPSS rescore
  72. 2026-07-25 14:17 UTCEPSS rescore
  73. 2026-07-24 14:17 UTCEPSS rescore
  74. 2026-07-23 03:08 UTCEG score recompute
  75. 2026-07-22 14:08 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-27856?
CVE-2026-27856 is a high vulnerability published on March 27, 2026. Doveadm credentials are verified using direct comparison which is susceptible to timing oracle attack. An attacker can use this to determine the configured credentials. Figuring out the credential will lead into full access to the affected component. Limit access to the doveadm http service port,…
When was CVE-2026-27856 disclosed?
CVE-2026-27856 was first published in the National Vulnerability Database on March 27, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-27856 actively exploited?
CVE-2026-27856 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 66.9% of all scored CVEs.
What is the CVSS score of CVE-2026-27856?
CVE-2026-27856 has a CVSS v3 base score of 5.9 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 7.4.
How do I remediate CVE-2026-27856?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-27856, 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

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