CVE-2026-27858

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-03-27. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 7.5Exploit: NoneExposed: 0

A fix is available — apply it.

Attacker can send a specifically crafted message before authentication that causes managesieve to allocate large amount of memory. Attacker can force managesieve-login to be unavailable by repeatedly crashing the process. Protect access to managesieve protocol, or install fixed version. No publicly available exploits are known.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity75% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
52.4%
KEV
Not listed

Published

March 27, 2026

Last Modified

July 15, 2026

Advisory Details (1)

Auto-updated Apr 30, 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-2026-27858(15)

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

Patch Availability(14)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntudovecot-submissiond (1:2.4.1+dfsg1-5ubuntu4.1) @ questing2026-06-11ubuntu
redhatdovecot-1:2.3.16-2.el8_6.12026-05-20redhat
redhatdovecot-1:2.3.8-9.el8_4.12026-05-20redhat
redhatdovecot-1:2.3.21-19.el10_22026-05-19redhat
redhatdovecot-1:2.3.16-18.el9_82026-05-19redhat
redhatdovecot-1:2.3.16-3.el8_8.12026-05-18redhat
redhatdovecot-1:2.3.16-15.el9_6.12026-05-14redhat
redhatdovecot-1:2.3.16-11.el9_4.22026-05-14redhat
redhatdovecot-1:2.3.16-3.el9_0.12026-05-14redhat
redhatdovecot-1:2.3.16-8.el9_2.22026-05-14redhat
redhatdovecot-1:2.3.21-16.el10_0.12026-05-14redhat
redhatdovecot-1:2.3.16-7.el8_102026-05-05redhat
redhatdovecot-1:2.3.16-15.el9_7.12026-05-05redhat
redhatdovecot-1:2.3.21-16.el10_1.12026-05-04redhat

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.

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 15× in last 7d / 50× 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 132 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-27858?
CVE-2026-27858 is a high vulnerability published on March 27, 2026. Attacker can send a specifically crafted message before authentication that causes managesieve to allocate large amount of memory. Attacker can force managesieve-login to be unavailable by repeatedly crashing the process. Protect access to managesieve protocol, or install fixed version. No publicly…
When was CVE-2026-27858 disclosed?
CVE-2026-27858 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-2026-27858 actively exploited?
CVE-2026-27858 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 52.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-27858?
CVE-2026-27858 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-27858?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-27858, 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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