CVE-2026-48840

Summary

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.

Affected Software

Weaknesses

• CWE-839: CWE-839 Numeric Range Comparison Without Minimum Check

ADP Enrichment

CVE Program Container

Additional References

• http://www.openwall.com/lists/oss-security/2026/05/29/3
• https://lists.debian.org/debian-lts-announce/2026/06/msg00004.html

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: partial

References

• https://exim.org/static/doc/security/EXIM-Security-2026-05-19.1
• https://www.openwall.com/lists/oss-security/2026/05/29/3

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