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CVE-2026-28753

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_mail_smtp_module module due to the improper handling of CRLF sequences in DNS responses. This allows an attacker-controlled DNS server to inject arbitrary headers into SMTP upstream requests, leading to potential request manipulation. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:577e61d80cf00bfe20883ae6090727301dfa8ceb7c07a708364283e451515f54
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
2

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"defaultStatus":"unknown","modules":["ngx_mail_proxy_module"],"product":"NGINX Open Source","vendor":"F5","versions":[{"lessThan":"1.29.7","status":"affected","version":"1.29.0","versionType":"semver"},{"lessThan":"1.28.3","status":"affected","version":"0.6.27","versionType":"semver"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a4e2aebb78597865d11259e162900713d397e29c151c8699ad5df1bde6e12f40 · sha256:ae3aa2311e37c69d… · /containers/cna/affected/0

{"defaultStatus":"unknown","modules":["ngx_mail_proxy_module"],"product":"NGINX Plus","vendor":"F5","versions":[{"lessThan":"R36 P3","status":"affected","version":"R36","versionType":"custom"},{"lessThan":"R35 P2","status":"affected","version":"R35","versionType":"custom"},{"lessThan":"*","status":"affected","version":"R34","versionType":"custom"},{"lessThan":"*","status":"affected","version":"R33","versionType":"custom"},{"lessThan":"R32 P5","status":"affected","version":"R32","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a4e2aebb78597865d11259e162900713d397e29c151c8699ad5df1bde6e12f40 · sha256:ae3aa2311e37c69d… · /containers/cna/affected/1
cvss · 2 assertions

{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":3.7,"baseSeverity":"LOW","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/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:a4e2aebb78597865d11259e162900713d397e29c151c8699ad5df1bde6e12f40 · sha256:ae3aa2311e37c69d… · /containers/cna/metrics/0/cvssV3_1

{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"HIGH","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":6.3,"baseSeverity":"MEDIUM","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact…

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:a4e2aebb78597865d11259e162900713d397e29c151c8699ad5df1bde6e12f40 · sha256:ae3aa2311e37c69d… · /containers/cna/metrics/1/cvssV4_0

Affected products and versions

2 source assertions
{"defaultStatus":"unknown","modules":["ngx_mail_proxy_module"],"product":"NGINX Open Source","vendor":"F5","versions":[{"lessThan":"1.29.7","status":"affected","version":"1.29.0","versionType":"semver"},{"lessThan":"1.28.3","status":"affected","version":"0.6.27","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a4e2aebb78597865d11259e162900713d397e29c151c8699ad5df1bde6e12f40 · sha256:ae3aa2311e37c69d… · /containers/cna/affected/0
{"defaultStatus":"unknown","modules":["ngx_mail_proxy_module"],"product":"NGINX Plus","vendor":"F5","versions":[{"lessThan":"R36 P3","status":"affected","version":"R36","versionType":"custom"},{"lessThan":"R35 P2","status":"affected","version":"R35","versionType":"custom"},{"lessThan":"*","status":"affected","version":"R34","versionType":"custom"},{"lessThan":"*","status":"affected","version":"R33","versionType":"custom"},{"lessThan":"R32 P5","status":"affected","version":"R32","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a4e2aebb78597865d11259e162900713d397e29c151c8699ad5df1bde6e12f40 · sha256:ae3aa2311e37c69d… · /containers/cna/affected/1

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":3.7,"baseSeverity":"LOW","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/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:a4e2aebb78597865d11259e162900713d397e29c151c8699ad5df1bde6e12f40 · sha256:ae3aa2311e37c69d… · /containers/cna/metrics/0/cvssV3_1
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"HIGH","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":6.3,"baseSeverity":"MEDIUM","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:a4e2aebb78597865d11259e162900713d397e29c151c8699ad5df1bde6e12f40 · sha256:ae3aa2311e37c69d… · /containers/cna/metrics/1/cvssV4_0

CWE assertions

1 source assertion
{"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:a4e2aebb78597865d11259e162900713d397e29c151c8699ad5df1bde6e12f40 · sha256:ae3aa2311e37c69d… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion
{"tags":["vendor-advisory"],"url":"https://my.f5.com/manage/s/article/K000160367"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a4e2aebb78597865d11259e162900713d397e29c151c8699ad5df1bde6e12f40 · sha256:ae3aa2311e37c69d… · /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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