CVE-2026-42008

MEDIUMPre-NVD 4.34.3
EchelonGraph scoreMEDIUM confidence

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

Score 4.3 from GitHub Security Advisory published 2026-08-28. A secondary CVSS source baseline 4.3; 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 week
4.3EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 4.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Forwarding information received from a host listed as a trusted proxy is not kept separate from Dovecot's own authentication fields, so a value sent by that host can be injected as an internal authentication field. Any host permitted to act as a trusted proxy can authenticate as any user without knowing that user's password. This affects deployments whose password database honours a field that permits authentication without a password. Deployments that do not configure trusted proxies are not affected. Restrict the list of trusted proxy networks to hosts that are fully under your control. Update to non-vulnerable version. No publicly available exploits are known.

CVSS v3
4.3
EG Score
4.3MEDIUMmedium confidence
EG Risk
19
EG Risk 19/100

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 (value × EchelonGraph’s weight)
Severity43% × 45%
The EG Score, 4.3 of 10.
Exploitation0.2% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (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: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
13th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (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)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (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

August 28, 2026

Last Modified

September 3, 2026

Advisory Details (1)

Auto-updated Aug 28, 2026
Patch available.
Web page
https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0003.json

Vendor Advisories for CVE-2026-42008(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
dovecot1:2.3.19.1+dfsg1-2.1 ... 1:2.4.5+dfsg1-3 (43 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
dovecot1:2.4.1+dfsg1-6 ... 1:2.4.1+dfsg1-6+deb13u6 (7 versions)
  • every version up to 1:2.4.1+dfsg1-6+deb13u7: fixed in 1:2.4.1+dfsg1-6+deb13u7
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
dovecot1:2.4.1+dfsg1-6 ... 1:2.4.4+dfsg1-2 (12 versions)
  • every version up to 1:2.4.5+dfsg1-1: fixed in 1:2.4.5+dfsg1-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 15× in last 7d / 72× 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.

Showing the most recent 100 of 120 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 20 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  3. 2026-10-12 16:07 UTCEG score recompute
  4. 2026-10-11 19:49 UTCEG score recompute
  5. 2026-10-11 17:03 UTCEG score recompute
  6. 2026-10-11 14:29 UTCEG score recompute
  7. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  9. 2026-10-10 03:53 UTCEG score recompute
  10. 2026-10-10 03:53 UTCGHSA enrichmentGHSA-hwmp-h522-jmhg · GitHub CVSS 4.3
  11. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  12. 2026-10-09 02:42 UTCEG score recompute
  13. 2026-10-09 02:42 UTCGHSA enrichmentGHSA-hwmp-h522-jmhg · GitHub CVSS 4.3
  14. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  15. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  16. 2026-10-07 09:50 UTCEG score recompute
  17. 2026-10-07 09:50 UTCGHSA enrichmentGHSA-hwmp-h522-jmhg · GitHub CVSS 4.3
  18. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  19. 2026-10-06 08:51 UTCEG score recompute
  20. 2026-10-06 08:51 UTCGHSA enrichmentGHSA-hwmp-h522-jmhg · GitHub CVSS 4.3
  21. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  22. 2026-10-05 08:13 UTCEG score recompute
  23. 2026-10-05 08:13 UTCGHSA enrichmentGHSA-hwmp-h522-jmhg · GitHub CVSS 4.3
  24. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  25. 2026-10-04 07:34 UTCEG score recompute
Show 75 more
  1. 2026-10-04 07:34 UTCGHSA enrichmentGHSA-hwmp-h522-jmhg · GitHub CVSS 4.3
  2. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  3. 2026-10-03 06:55 UTCEG score recompute
  4. 2026-10-03 06:55 UTCGHSA enrichmentGHSA-hwmp-h522-jmhg · GitHub CVSS 4.3
  5. 2026-10-02 06:17 UTCEG score recompute
  6. 2026-10-02 06:16 UTCGHSA enrichmentGHSA-hwmp-h522-jmhg · GitHub CVSS 4.3
  7. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  8. 2026-10-01 04:31 UTCEG score recompute
  9. 2026-10-01 04:31 UTCGHSA enrichmentGHSA-hwmp-h522-jmhg · GitHub CVSS 4.3
  10. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  11. 2026-09-30 03:52 UTCEG score recompute
  12. 2026-09-30 03:52 UTCGHSA enrichmentGHSA-hwmp-h522-jmhg · GitHub CVSS 4.3
  13. 2026-09-28 21:09 UTCEG score recompute
  14. 2026-09-28 21:09 UTCGHSA enrichmentGHSA-hwmp-h522-jmhg · GitHub CVSS 4.3
  15. 2026-09-27 16:15 UTCEG score recompute
  16. 2026-09-27 16:15 UTCGHSA enrichmentGHSA-hwmp-h522-jmhg · GitHub CVSS 4.3
  17. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  18. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  19. 2026-09-26 15:37 UTCEG score recompute
  20. 2026-09-26 15:37 UTCGHSA enrichmentGHSA-hwmp-h522-jmhg · GitHub CVSS 4.3
  21. 2026-09-25 11:42 UTCEG score recompute
  22. 2026-09-25 11:42 UTCGHSA enrichmentGHSA-hwmp-h522-jmhg · GitHub CVSS 4.3
  23. 2026-09-24 10:51 UTCEG score recompute
  24. 2026-09-24 10:51 UTCGHSA enrichmentGHSA-hwmp-h522-jmhg · GitHub CVSS 4.3
  25. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  26. 2026-09-23 10:12 UTCEG score recompute
  27. 2026-09-23 10:12 UTCGHSA enrichmentGHSA-hwmp-h522-jmhg · GitHub CVSS 4.3
  28. 2026-09-22 09:33 UTCEG score recompute
  29. 2026-09-22 09:33 UTCGHSA enrichmentGHSA-hwmp-h522-jmhg · GitHub CVSS 4.3
  30. 2026-09-21 08:55 UTCEG score recompute
  31. 2026-09-21 08:55 UTCGHSA enrichmentGHSA-hwmp-h522-jmhg · GitHub CVSS 4.3
  32. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  33. 2026-09-20 08:16 UTCEG score recompute
  34. 2026-09-20 08:16 UTCGHSA enrichmentGHSA-hwmp-h522-jmhg · GitHub CVSS 4.3
  35. 2026-09-19 07:19 UTCEG score recompute
  36. 2026-09-19 07:19 UTCGHSA enrichmentGHSA-hwmp-h522-jmhg · GitHub CVSS 4.3
  37. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  38. 2026-09-18 06:41 UTCEG score recompute
  39. 2026-09-18 06:41 UTCGHSA enrichmentGHSA-hwmp-h522-jmhg · GitHub CVSS 4.3
  40. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  41. 2026-09-17 06:02 UTCEG score recompute
  42. 2026-09-17 06:02 UTCGHSA enrichmentGHSA-hwmp-h522-jmhg · GitHub CVSS 4.3
  43. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  44. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  45. 2026-09-16 05:03 UTCGHSA enrichmentGHSA-hwmp-h522-jmhg · GitHub CVSS 4.3
  46. 2026-09-15 04:24 UTCEG score recompute
  47. 2026-09-15 04:24 UTCGHSA enrichmentGHSA-hwmp-h522-jmhg · GitHub CVSS 4.3
  48. 2026-09-14 03:44 UTCEG score recompute
  49. 2026-09-14 03:44 UTCGHSA enrichmentGHSA-hwmp-h522-jmhg · GitHub CVSS 4.3
  50. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  51. 2026-09-13 03:05 UTCEG score recompute
  52. 2026-09-13 03:05 UTCGHSA enrichmentGHSA-hwmp-h522-jmhg · GitHub CVSS 4.3
  53. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  54. 2026-09-12 02:26 UTCEG score recompute
  55. 2026-09-12 02:26 UTCGHSA enrichmentGHSA-hwmp-h522-jmhg · GitHub CVSS 4.3
  56. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  57. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  58. 2026-09-11 01:47 UTCEG score recompute
  59. 2026-09-11 01:47 UTCGHSA enrichmentGHSA-hwmp-h522-jmhg · GitHub CVSS 4.3
  60. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  61. 2026-09-10 01:08 UTCGHSA enrichmentGHSA-hwmp-h522-jmhg · GitHub CVSS 4.3
  62. 2026-09-09 00:30 UTCEG score recompute
  63. 2026-09-09 00:30 UTCGHSA enrichmentGHSA-hwmp-h522-jmhg · GitHub CVSS 4.3
  64. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  65. 2026-09-07 20:54 UTCEG score recompute
  66. 2026-09-07 20:54 UTCGHSA enrichmentGHSA-hwmp-h522-jmhg · GitHub CVSS 4.3
  67. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  68. 2026-09-06 20:16 UTCEG score recompute
  69. 2026-09-06 20:16 UTCGHSA enrichmentGHSA-hwmp-h522-jmhg · GitHub CVSS 4.3
  70. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  71. 2026-09-05 19:37 UTCEG score recompute
  72. 2026-09-05 19:37 UTCGHSA enrichmentGHSA-hwmp-h522-jmhg · GitHub CVSS 4.3
  73. 2026-09-04 18:59 UTCEG score recompute
  74. 2026-09-04 18:59 UTCGHSA enrichmentGHSA-hwmp-h522-jmhg · GitHub CVSS 4.3
  75. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.2% · 9th percentile

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Frequently asked(5)

What is CVE-2026-42008?
CVE-2026-42008 is a medium-severity vulnerability; its CVE record was published on August 28, 2026. Forwarding information received from a host listed as a trusted proxy is not kept separate from Dovecot's own authentication fields, so a value sent by that host can be injected as an internal authentication field. Any host permitted to act as a trusted proxy can authenticate as any user without…
When was the CVE record for CVE-2026-42008 published?
The CVE record for CVE-2026-42008 was published on August 28, 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 September 3, 2026; the record at its source may have been updated since.
Is CVE-2026-42008 actively exploited?
CVE-2026-42008 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (13th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-42008?
CVE-2026-42008 has a CVSS base score of 4.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-42008?
A fix for CVE-2026-42008 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-42008 are linked in the Vendor Advisories panel on this page.

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