CVE-2026-28753
CVE-2026-28753: 2 tracked advisory records across F5, Red Hat. Compare vendor sources and published fix guidance.
Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.
Vendor advisory comparison
F5
1 advisory- Advisory severityMedium6.3
Medium [CVE-2026-28753] NGINX Plus and NGINX Open Source have a vulnerability in the ngx_mail_smtp_module module
CVE-2026-28753Source published Source updated
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.
- Related products — impact not confirmed
- NGINX Plus
- Source-reported affected versions
- Affected-version details not available in this record.
- Source-reported fixed versions
- No fixed-version detail extracted. This does not mean no fix exists.
- Mitigation guidance
- No mitigation guidance extracted; consult the source.
Red Hat
1 advisory- Advisory severityLow3.7
Low [CVE-2026-28753] NGINX Plus and NGINX Open Source: Request manipulation via header injection in SMTP upstream requests
CVE-2026-28753Source published
NGINX Plus and NGINX Open Source: Request manipulation via header injection in SMTP upstream requests. Red Hat rates this low (CVSS 3.7). Weakness: CWE-93. Affected package(s): nginx-main. Resolved in Red Hat advisory RHSA-2026:8346 — update the affected packages (`sudo dnf update`).
- Related products — impact not confirmed
- nginx-main
- Red Hat Enterprise Linux
- Source-reported affected versions
- nginx-main-1.30.0-1.hum1
- Source-reported fixed versions
- RHSA-2026:8346
- Mitigation guidance
- Update the affected package(s) to the fixed version shipped in RHSA-2026:8346 (`sudo dnf update` / `yum update`).
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