How severe is CVE-2026-94057?

CVE-2026-94057 has a CVSS 3.x base score of 4.0, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2026-94057 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-94057?

CVE-2026-94057 affects Exim. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-94057?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2026-94057 published?

CVE-2026-94057 was published on 2026-09-19 and last updated on 2026-09-24.

CVE-2026-94057

CVE-2026-94057 is a medium-severity vulnerability in Exim with a CVSS 3.x base score of 4.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-93.

Key facts

Severity: Medium (CVSS 3.x base score 4.0)
EPSS exploit prediction: 0% (9th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-93
Affected product: Exim
Published: 2026-09-19
Last modified: 2026-09-24

Description

Exim before 4.100.1 allows SMTP smuggling in which the received message does not match any sent message, and instead depends on crafted data sent after a rejection during DATA processing.

Frequently asked questions

What is CVE-2026-94057?: Exim before 4.100.1 allows SMTP smuggling in which the received message does not match any sent message, and instead depends on crafted data sent after a rejection during DATA processing.
How severe is CVE-2026-94057?: CVE-2026-94057 has a CVSS 3.x base score of 4.0, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2026-94057 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-94057?: CVE-2026-94057 affects Exim. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-94057?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-94057 published?: CVE-2026-94057 was published on 2026-09-19 and last updated on 2026-09-24.

References

https://lists.exim.org/lurker/message/20260918.121220.0f87338e.en.html

Affected products (1)

cpe:2.3:a:exim:exim:*:*:*:*:*:*:*:*

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Other CWE-93 (CRLF Injection) vulnerabilities

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CVE-2026-100717 — Critical (CVSS 9.9): froxlor is a server administration panel. In versions 2.3.10 and earlier, Validate::validateUrl rejects carriage return…
CVE-2026-90937 — Critical (CVSS 9.9): froxlor versions before 2.2.5 fail to validate newline characters in subdomain redirect URLs, allowing authenticated…
CVE-2026-70615 — Critical (CVSS 9.9): boringproxy through 0.10.0 contains a newline injection vulnerability that allows authenticated low-privileged users…
CVE-2026-45372 — Critical (CVSS 9.9): cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.44.0, when cpp-httplib's…

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Threat intelligence

Threat-intel indicators referencing this CVE:

64.23.143.231 (ipv4-addr)
103.212.120.214 (ipv4-addr)
103.24.12.154 (ipv4-addr)
182.160.155.166 (ipv4-addr)
23.235.194.34 (ipv4-addr)
113.197.39.61 (ipv4-addr)
67.43.6.125 (ipv4-addr)
67.43.15.13 (ipv4-addr)