cve-2026-28389
MEDIUM CVSS 5.9 csaf_redhat
Description
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
Timeline
- Published
- 2026-04-07 00:00 UTC
- Last Modified
- 2026-09-01
CVSS Details
CVSS details not available.
Affected Products
No product information available.
Weaknesses (CWE)
References
No references available.
Linked Vulnerabilities
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{
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"cwe": {
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"name": "Improper Handling of Missing Special Element"
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{
"category": "description",
"text": "A flaw was found in OpenSSL. A remote attacker could exploit this by sending a specially crafted Cryptographic Message Syntax (CMS) EnvelopedData message with KeyAgreeRecipientInfo. This vulnerability arises because the software attempts to process an optional field without verifying its existence, leading to a NULL pointer dereference. This can result in a Denial of Service (DoS) for applications that handle untrusted CMS data.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "openssl: OpenSSL: Denial of Service vulnerability in CMS processing",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This Low impact flaw affects applications processing Cryptographic Message Syntax (CMS) data, specifically crafted CMS EnvelopedData messages with KeyAgreeRecipientInfo. A NULL pointer dereference can occur if the optional parameters field of KeyEncryptionAlgorithmIdentifier is missing, leading to a Denial of Service. Red Hat products are vulnerable if they call `CMS_decrypt()` or `PKCS7_decrypt()` on untrusted input, such as in S/MIME processing or CMS-based protocols.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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},
{
"category": "external",
"summary": "https://openssl-library.org/news/secadv/20260407.txt",
"url": "https://openssl-library.org/news/secadv/20260407.txt"
}
],
"release_date": "2026-04-07T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-04-09T08:50:10+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
"product_ids": [
"Red Hat Hardened Images:openssl-main@aarch64",
"Red Hat Hardened Images:openssl-main@src",
"Red Hat Hardened Images:openssl-main@x86_64"
],
"url": "https://access.redhat.com/errata/RHSA-2026:7261"
},
{
"category": "workaround",
"details": "To mitigate this issue, avoid processing untrusted CMS EnvelopedData messages with KeyAgreeRecipientInfo. Restrict network access to services that process CMS data from untrusted sources. If possible, configure applications to only accept CMS data from trusted origins. This operational control helps reduce exposure to the vulnerability.",
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},
{
"category": "none_available",
"details": "Fix deferred",
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}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"products": [
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}
],
"threats": [
{
"category": "impact",
"details": "Low",
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"red_hat_openshift_container_platform_4:openshift/ose-rhel-coreos-9"
]
}
],
"title": "openssl: OpenSSL: Denial of Service vulnerability in CMS processing"
}
]
}