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
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: None knownExposed: 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)
EG Risk
39(Track)
EG Risk 39/100SSVC: 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
Severity53% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
18%
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 (4.99.1-1ubuntu1.3) @ resolute2026-08-25ubuntu
ubuntueximon4 (4.86.2-2ubuntu2.6+esm9) @ xenial2026-08-25ubuntu

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)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
exim44.94.2-7 ... 4.94.2-7+deb11u5 (6 versions)4.94.2-7+deb11u6—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
exim44.96-15 ... 4.96-15+deb12u9 (10 versions)4.96-15+deb12u10—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
exim44.98.2-1, 4.98.2-1+deb13u1, 4.98.2-1+deb13u24.98.2-1+deb13u3—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
exim44.98.2-1 ... 4.99~RC3-2 (30 versions)4.99.3-2—

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 6× in last 7d / 69× 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 235 total refreshes for this CVE.

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

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 0% probability of exploitation in the next 30 days, which ranks it in the top 81.9% of all scored CVEs.
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

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