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CVE-2026-23829

Mailpit is an email testing tool and API for developers. Prior to version 1.28.3, Mailpit's SMTP server is vulnerable to Header Injection due to an insufficient Regular Expression used to validate `RCPT TO` and `MAIL FROM` addresses. An attacker can inject arbitrary SMTP headers (or corrupt existing ones) by including carriage return characters (`\r`) in the email address. This header injection occurs because the regex intended to filter control characters fails to exclude `\r` and `\n` when use
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:96b05d60119dc74cd81e5a4eb85a25638cbf668a20cef42cbfd5a74ef2c91e9a
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-93","description":"CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:80eaca68ed1ad97f159d70734b98dd085ea236e61cd5215408120d23ef92edaa · sha256:b1bddfb90164e944… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-150","description":"CWE-150: Improper Neutralization of Escape, Meta, or Control Sequences","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:80eaca68ed1ad97f159d70734b98dd085ea236e61cd5215408120d23ef92edaa · sha256:b1bddfb90164e944… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"product":"mailpit","vendor":"axllent","versions":[{"status":"affected","version":"< 1.28.3"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:80eaca68ed1ad97f159d70734b98dd085ea236e61cd5215408120d23ef92edaa · sha256:b1bddfb90164e944… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:80eaca68ed1ad97f159d70734b98dd085ea236e61cd5215408120d23ef92edaa · sha256:b1bddfb90164e944… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-93","description":"CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:80eaca68ed1ad97f159d70734b98dd085ea236e61cd5215408120d23ef92edaa · sha256:b1bddfb90164e944… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-150","description":"CWE-150: Improper Neutralization of Escape, Meta, or Control Sequences","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:80eaca68ed1ad97f159d70734b98dd085ea236e61cd5215408120d23ef92edaa · sha256:b1bddfb90164e944… · /containers/cna/problemTypes/1/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/axllent/mailpit/commit/36cc06c125954dec6673219dafa084e13cc14534","tags":["x_refsource_MISC"],"url":"https://github.com/axllent/mailpit/commit/36cc06c125954dec6673219dafa084e13cc14534"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:80eaca68ed1ad97f159d70734b98dd085ea236e61cd5215408120d23ef92edaa · sha256:b1bddfb90164e944… · /containers/cna/references/1
{"name":"https://github.com/axllent/mailpit/releases/tag/v1.28.3","tags":["x_refsource_MISC"],"url":"https://github.com/axllent/mailpit/releases/tag/v1.28.3"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:80eaca68ed1ad97f159d70734b98dd085ea236e61cd5215408120d23ef92edaa · sha256:b1bddfb90164e944… · /containers/cna/references/2
{"name":"https://github.com/axllent/mailpit/security/advisories/GHSA-54wq-72mp-cq7c","tags":["x_refsource_CONFIRM"],"url":"https://github.com/axllent/mailpit/security/advisories/GHSA-54wq-72mp-cq7c"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:80eaca68ed1ad97f159d70734b98dd085ea236e61cd5215408120d23ef92edaa · sha256:b1bddfb90164e944… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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