CVE-2026-48840

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory published 2026-05-30. a secondary CVSS source baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
5.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.3Exploit: NoneExposed: 0

A fix is available — apply it.

Exim 4.88 before 4.99.4, in some proxy configurations, mishandles certain short payloads, leading to disclosure of uninitialized stack memory values to a client.

CVSS v3
5.3
EG Score
5.3(medium)
EPSS
18.1%
KEV
Not listed

Published

May 30, 2026

Last Modified

July 22, 2026

Advisory Details (4)

Auto-updated Jun 16, 2026
Patch available.
generic Patch Available

[SECURITY] [DLA 4615-1] exim4 security update

https://lists.debian.org/debian-lts-announce/2026/06/msg00004.html
generic

oss-security - CVE-2026-48840: Exim 4.99.4: PROXY-protocol uninitialised-stack information disclosure

http://www.openwall.com/lists/oss-security/2026/05/29/3
generic

oss-security - CVE-2026-48840: Exim 4.99.4: PROXY-protocol uninitialised-stack information disclosure

https://www.openwall.com/lists/oss-security/2026/05/29/3
generic

Index of /static/doc/security/EXIM-Security-2026-05-19.1/

https://exim.org/static/doc/security/EXIM-Security-2026-05-19.1

Vendor Advisories for CVE-2026-48840(1)

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
ubuntueximon4 (4.98.2-1ubuntu2.3) @ questing2026-07-16ubuntu
ubuntueximon4 (4.93-13ubuntu1.12+esm1) @ focal2026-07-16ubuntu

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(1)

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

All Vendor Advisories

(2)

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 10× in last 7d / 55× 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 129 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-48840?
CVE-2026-48840 is a medium vulnerability published on May 30, 2026. Exim 4.88 before 4.99.4, in some proxy configurations, mishandles certain short payloads, leading to disclosure of uninitialized stack memory values to a client.
When was CVE-2026-48840 disclosed?
CVE-2026-48840 was first published in the National Vulnerability Database on May 30, 2026, with the most recent update on July 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-48840 actively exploited?
CVE-2026-48840 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 18.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-48840?
CVE-2026-48840 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-48840?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-48840, 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-2026-48840

Explore →

Is Your Infrastructure Affected by CVE-2026-48840?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs