Is CVE-2026-28755 in the CISA KEV catalog?

No. CVE-2026-28755 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-28755?

CVE-2026-28755 has a CVSS v3 base score of 5.4 (Moderate).

What is the EPSS score for CVE-2026-28755?

CVE-2026-28755 has an EPSS score of 0.13% (3th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-28755?

Upgrade nginx on debian unstable to 1.28.3-2 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2026-28755

MEDIUM

5.4

CVSS v3

NVD

Description

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_stream_ssl_module module due to the improper handling of revoked certificates when configured with the ssl_verify_client on and ssl_ocsp on directives, allowing the TLS handshake to succeed even after an OCSP check identifies the certificate as revoked. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

CWE-863Incorrect Authorization

How to fix

Remediation Available

nginxDebian

Fixed in:1.28.3-2CVE-2026-28755

nginxRed Hat / RHEL

Fixed in:main@aarch64RHSA-2026:8346

Fixed in:main@noarchRHSA-2026:8346

Fixed in:main@x86_64RHSA-2026:8346

Fixed in:main@srcRHSA-2026:8346

nginxRocky

Fixed in:main@aarch64RHSA-2026:8346

Fixed in:main@srcRHSA-2026:8346

Fixed in:main@x86_64RHSA-2026:8346

Fixed in:main@noarchRHSA-2026:8346

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Exploit Intelligence

0.13%probability of exploitation in 30 days

3rdpercentile

Low risk: more likely to be exploited than 3% of all known CVEs.

References

Vendor Advisory1

my.f5.com

Related Vulnerabilities

Other CWE-863 (Incorrect Authorization) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-22518	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2023-38035	Critical	9.8	100%	KEV + Ransom	-
CVE-2022-46169	Critical	9.8	100%	KEV	Fix
CVE-2025-29927	Critical	9.1	100%	-	Fix
CVE-2024-38856	Critical	9.8	99%	KEV	Fix
CVE-2020-36289	Medium	5.3	99%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-03-26.