[UPDATE] [medium] OpenSSL: Multiple vulnerabilities

mediumCVE-2026-28386 CVE-2026-28387 CVE-2026-28388 CVE-2026-28389 CVE-2026-28390 CVE-2026-31789

An attacker can exploit multiple vulnerabilities in OpenSSL to conduct a denial of service attack, disclose sensitive information, or perform other unspecified attacks.

CSIRTS triage

vendor: OpenSSL product: OpenSSL Denial of service Information disclosureOther

What: Multiple vulnerabilities can be exploited to conduct denial of service attacks, disclose sensitive information, or perform other unspecified attacks.
Who is affected: Deployments of OpenSSL are affected by these vulnerabilities.
Urgency: Remediation is medium urgency due to the medium severity of the vulnerabilities and lack of current exploitation.
Action: Update to the latest version of OpenSSL to mitigate these vulnerabilities.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity: medium
Published: 2026-08-24
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-0995

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-283860.31% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 24% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-283870.67% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 49% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-283880.89% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 57% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-283890.80% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 54% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-283900.80% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 54% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-317890.24% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 16% of all EPSS-scored CVEs.
Moderate exploitation riskCVE-2026-317901.0% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 61% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-28386	coverage & exploitation status	NVD · CVE.org
CVE-2026-28387	coverage & exploitation status	NVD · CVE.org
CVE-2026-28388	coverage & exploitation status	NVD · CVE.org
CVE-2026-28389	coverage & exploitation status	NVD · CVE.org
CVE-2026-28390	coverage & exploitation status	NVD · CVE.org
CVE-2026-31789	coverage & exploitation status	NVD · CVE.org
CVE-2026-31790	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

high[NEW] [high] IBM App Connect Enterprise: Multiple vulnerabilitiescert-bund
high[NEW] [high] Oracle Communications: Multiple vulnerabilitiescert-bund
unknownMultiple vulnerabilities in Oracle Database Server (July 23, 2026)cert-fr-avis
unknownMultiple vulnerabilities in Splunk products (July 16, 2026)cert-fr-avis
unknownMultiple vulnerabilities in Tenable Identity Exposure (June 24, 2026)cert-fr-avis

Recent advisories for OpenSSL

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

unknownOpenSSL security advisory (AV26-846)cccs · 2026-08-25
unknownUSN-8678-1: OpenSSL vulnerabilitiesubuntu · 2026-08-25
highCVE-2026-63076: Issue summary: OpenSSL CMP password based protection verification only checks whether the prot…nvd · 2026-08-25
highCVE-2026-63075: Issue summary: When OpenSSL processes QUIC traffic from a peer that repeatedly sends ack-elici…nvd · 2026-08-25
mediumCVE-2026-63074: Issue summary: The OpenSSL Certificate Management Protocol (CMP) caches additional certificate…nvd · 2026-08-25
unknownCVE-2026-63073: Issue summary: OpenSSL CMP response validation passed an unexpected response sender distinguis…nvd · 2026-08-25