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TI-2026-63291 Aliases CVE-2026-94054GHSA-r24f-7cqq-88w4

Exim before 4.100.1, when Proxy-Protocol is used with an attacker-controlled proxy, has an out-of-bounds write.

Priority LOW 30CWE-787Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
Low · High · Low
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

Exim before 4.100.1, when Proxy-Protocol is used with an attacker-controlled proxy, has an out-of-bounds write.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00268 19th percentileScored 2026-11-07
Fix Fixed Exim (Exim): 4.100.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
EximExim4.83 to before 4.100.14.100.1Patch availableCNA
  • Exim VendorExim Affected 4.83 to before 4.100.1 Fixed in 4.100.1 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:exim:exim:*:*:*:*:*:*:*:*before 4.100.1VulnerableExim
  • cpe:2.3:a:exim:exim:*:*:*:*:*:*:*:* Versions before 4.100.1 Vulnerable ·Exim

Remediation

  • Fix · CNA Exim (Exim) Fixed in 4.100.1

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Exim 4.100.1

    4 records Highest priority Priority LOW 4 LOW

    Other records, highest priority first

    • TI-2026-63293 Use of uninitialized resource in EximPriority LOW 32
    • TI-2026-63292 Exim before 4.100.1, when certain non-default TLS settings are used with GnuTLS, has a use-after-free.Priority LOW 24
    • TI-2026-63294 Exim before 4.100.1 allows SMTP smuggling in which the received message does not match…Priority LOW 23
    Show all 4 records →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-94054
  2. 2026-10-03 Alias added: GHSA-r24f-7cqq-88w4

References

Advisory 1

  • TI-2019-12627 Exim 4.92 through 4.92.2 allows remote code execution, a different vulnerability than… KEVCVSS 3.1CRITICAL 9.8
  • TI-2019-07471 OS command injection in exim KEVCVSS 3.1CRITICAL 9.8
  • TI-2018-04965 An issue was discovered in the base64d function in the SMTP listener in Exim before… KEVCVSS 3.1CRITICAL 9.8
  • TI-2010-04077 Heap-based buffer overflow in the string_vformat function in string.c in Exim before 4.70… KEVCVSS 3.1CRITICAL 9.8
  • TI-2010-04078 Exim 4.72 and earlier allows local users to gain privileges by leveraging the ability of… KEVCVSS 3.1HIGH 7.8
  • TI-2025-19707 SQL injection in Exim CVSS 3.1CRITICAL 9.8
See all 69 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences