CVE-2026-27851

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 66% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.1Exploit: None knownExposed: 0

A fix is available — apply it.

When safe filter is used with variable expansion, all following pipelines on the same string are incorrectly interpreted as safe too, enabling unsafe data to be unescaped. This can enable SQL / LDAP injection attacks when used in authentication. Avoid using safe filter until on fixed version. No publicly available exploits are known.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
41(Track)
EG Risk 41/100SSVC: 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
Severity91% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
35%
KEV
Not listed

Published

May 12, 2026

Last Modified

July 15, 2026

Advisory Details (4)

Auto-updated Sep 16, 2026
Patch available. Sources: redhat.
redhat

Affected: Red Hat Enterprise Linux 10",

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27851.json
redhat

2476471 – (CVE-2026-27851) CVE-2026-27851 dovecot: Dovecot: SQL/LDAP injection via incorrect safe filter interpretation with variable expansion

https://bugzilla.redhat.com/show_bug.cgi?id=2476471
redhat Patch Available

CVE-2026-27851 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-27851
generic
https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0002.json

Vendor Advisories for CVE-2026-27851(1)

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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntudovecot-submissiond (1:2.3.21+dfsg1-2ubuntu6.5) @ noble2026-08-23ubuntu

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

(4 across 4 ecosystems)
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
dovecot—2.4.4-r0—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
dovecot—2.4.4-r0—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
dovecot1:2.4.1+dfsg1-6 ... 1:2.4.1+dfsg1-6+deb13u5 (6 versions)1:2.4.1+dfsg1-6+deb13u6—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
dovecot1:2.4.1+dfsg1-6 ... 1:2.4.3+dfsg1-2 (10 versions)1:2.4.4+dfsg1-1—

Weakness Classification(2)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 7× in last 7d / 31× 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 371 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. 2026-09-11 11:23 UTCOSV refresh
  10. 2026-09-10 09:34 UTCEPSS rescore
  11. 2026-09-08 22:00 UTCEPSS rescore
  12. 2026-09-07 16:01 UTCEPSS rescore
  13. 2026-09-06 13:47 UTCEPSS rescore
  14. 2026-09-06 13:47 UTCEPSS rescore
  15. 2026-09-04 05:06 UTCEPSS rescore
  16. 2026-09-02 14:11 UTCEPSS rescore
  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 18:28 UTCEG score recompute
  2. 2026-08-23 18:28 UTCVendor advisory
  3. 2026-08-23 18:28 UTCGHSA enrichment
  4. 2026-08-23 00:19 UTCEPSS rescore
  5. 2026-08-21 23:49 UTCEPSS rescore
  6. 2026-08-20 22:55 UTCEPSS rescore
  7. 2026-08-19 17:03 UTCEPSS rescore
  8. 2026-08-18 13:48 UTCEPSS rescore
  9. 2026-08-17 14:59 UTCEG score recompute
  10. 2026-08-17 14:59 UTCVendor advisory
  11. 2026-08-17 14:59 UTCGHSA enrichment
  12. 2026-08-17 13:47 UTCEPSS rescore
  13. 2026-08-17 10:56 UTCEG score recompute
  14. 2026-08-17 10:56 UTCVendor advisory
  15. 2026-08-17 10:56 UTCGHSA enrichment
  16. 2026-08-16 14:56 UTCEPSS rescore
  17. 2026-08-16 12:23 UTCVendor advisory
  18. 2026-08-16 12:23 UTCGHSA enrichment
  19. 2026-08-16 08:21 UTCVendor advisory
  20. 2026-08-16 08:21 UTCGHSA enrichment
  21. 2026-08-16 04:18 UTCEG score recompute
  22. 2026-08-16 04:18 UTCVendor advisory
  23. 2026-08-16 04:18 UTCGHSA enrichment
  24. 2026-08-16 02:14 UTCEPSS rescore
  25. 2026-08-15 01:30 UTCEPSS rescore
  26. 2026-08-14 23:03 UTCVendor advisory
  27. 2026-08-14 23:03 UTCGHSA enrichment
  28. 2026-08-14 19:01 UTCVendor advisory
  29. 2026-08-14 19:01 UTCGHSA enrichment
  30. 2026-08-14 14:58 UTCVendor advisory
  31. 2026-08-14 14:58 UTCGHSA enrichment
  32. 2026-08-14 10:55 UTCVendor advisory
  33. 2026-08-14 10:55 UTCGHSA enrichment
  34. 2026-08-14 06:52 UTCVendor advisory
  35. 2026-08-14 06:52 UTCGHSA enrichment
  36. 2026-08-14 02:49 UTCEG score recompute
  37. 2026-08-14 02:49 UTCVendor advisory
  38. 2026-08-14 02:49 UTCGHSA enrichment
  39. 2026-08-13 22:00 UTCEPSS rescore
  40. 2026-08-13 08:32 UTCVendor advisory
  41. 2026-08-13 08:32 UTCGHSA enrichment
  42. 2026-08-13 04:29 UTCVendor advisory
  43. 2026-08-13 04:29 UTCGHSA enrichment
  44. 2026-08-13 00:26 UTCVendor advisory
  45. 2026-08-13 00:26 UTCGHSA enrichment
  46. 2026-08-12 20:24 UTCVendor advisory
  47. 2026-08-12 20:24 UTCGHSA enrichment
  48. 2026-08-12 16:20 UTCEG score recompute
  49. 2026-08-12 16:20 UTCVendor advisory
  50. 2026-08-12 16:20 UTCGHSA enrichment
  51. 2026-08-12 13:50 UTCEPSS rescore
  52. 2026-08-11 23:49 UTCVendor advisory
  53. 2026-08-11 23:49 UTCGHSA enrichment
  54. 2026-08-11 19:46 UTCVendor advisory
  55. 2026-08-11 19:46 UTCGHSA enrichment
  56. 2026-08-11 15:43 UTCEG score recompute
  57. 2026-08-11 15:43 UTCVendor advisory
  58. 2026-08-11 15:43 UTCGHSA enrichment
  59. 2026-08-11 13:42 UTCEPSS rescore
  60. 2026-08-11 09:12 UTCVendor advisory
  61. 2026-08-11 09:12 UTCGHSA enrichment
  62. 2026-08-11 05:09 UTCVendor advisory
  63. 2026-08-11 05:09 UTCGHSA enrichment
  64. 2026-08-11 01:06 UTCEG score recompute
  65. 2026-08-11 01:06 UTCVendor advisory
  66. 2026-08-11 01:06 UTCGHSA enrichment
  67. 2026-08-11 00:00 UTCEPSS rescore
  68. 2026-08-10 11:33 UTCVendor advisory
  69. 2026-08-10 11:33 UTCGHSA enrichment
  70. 2026-08-10 06:43 UTCVendor advisory
  71. 2026-08-10 06:43 UTCGHSA enrichment
  72. 2026-08-10 02:40 UTCVendor advisory
  73. 2026-08-10 02:40 UTCGHSA enrichment
  74. 2026-08-09 22:36 UTCVendor advisory
  75. 2026-08-09 22:36 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-27851?
CVE-2026-27851 is a critical vulnerability published on May 12, 2026. When safe filter is used with variable expansion, all following pipelines on the same string are incorrectly interpreted as safe too, enabling unsafe data to be unescaped. This can enable SQL / LDAP injection attacks when used in authentication. Avoid using safe filter until on fixed version. No…
When was CVE-2026-27851 disclosed?
CVE-2026-27851 was first published in the National Vulnerability Database on May 12, 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-2026-27851 actively exploited?
CVE-2026-27851 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 65.4% of all scored CVEs.
What is the CVSS score of CVE-2026-27851?
CVE-2026-27851 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-27851?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-27851, 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.

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