| VID |
210298 |
| Severity |
40 |
| Port |
80, ... |
| Protocol |
TCP |
| Class |
WWW |
| Detailed Description |
The version of OpenSSL installed on the remote host is prior to 3.4.5. It is, therefore, affected by multiple vulnerabilities as referenced in the 3.4.5 advisory.
- Issue summary: Converting an excessively large OCTET STRING value to a hexadecimal string leads to a heap buffer overflow on 32 bit platforms.
Impact summary: A heap buffer overflow may lead to a crash or possibly an attacker controlled code execution or other undefined behavior. If an attacker can supply a crafted X.509 certificate with an excessively large OCTET STRING value in extensions such as the Subject Key Identifier (SKID) or Authority Key Identifier (AKID) which are being converted to hex, the size of the buffer needed for the result is calculated as multiplication of the input length by 3. On 32 bit platforms, this multiplication may overflow resulting in the allocation of a smaller buffer and a heap buffer overflow. Applications and services that print or log contents of untrusted X.509 certificates are vulnerable to this issue. As the certificates would have to have sizes of over 1 Gigabyte, printing or logging such certificates is a fairly unlikely operation and only 32 bit platforms are affected, this issue was assigned Low severity. The FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary. Fixed in OpenSSL 3.0.20 (Affected since 3.0.0). (CVE-2026-31789)
- Issue summary: When a delta CRL that contains a Delta CRL Indicator extension is processed a NULL pointer dereference might happen if the required CRL Number extension is missing.
Impact summary: A NULL pointer dereference can trigger a crash which leads to a Denial of Service for an application. When CRL processing and delta CRL processing is enabled during X.509 certificate verification, the delta CRL processing does not check whether the CRL Number extension is NULL before dereferencing it. When a malformed delta CRL file is being processed, this parameter can be NULL, causing a NULL pointer dereference. Exploiting this issue requires the X509_V_FLAG_USE_DELTAS flag to be enabled in the verification context, the certificate being verified to contain a freshestCRL extension or the base CRL to have the EXFLAG_FRESHEST flag set, and an attacker to provide a malformed CRL to an application that processes it. The vulnerability is limited to Denial of Service and cannot be escalated to achieve code execution or memory disclosure. For that reason the issue was assessed as Low severity according to our Security Policy. The FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary. Fixed in OpenSSL 1.1.1zg (Affected since 1.1.1). (CVE-2026-28388)
* References:
https://openssl-library.org/news/secadv/20260407.txt
https://www.cve.org/CVERecord?id=CVE-2026-28387
https://www.cve.org/CVERecord?id=CVE-2026-28388
https://www.cve.org/CVERecord?id=CVE-2026-28389
https://www.cve.org/CVERecord?id=CVE-2026-28390
https://www.cve.org/CVERecord?id=CVE-2026-31789
https://www.cve.org/CVERecord?id=CVE-2026-31790
* Platforms Affected:
OpenSSL 3.4.x before 3.4.5
Linux Any version
Unix Any version
Microsoft Windows Any version |
| Recommendation |
Upgrade to the latest version of OpenSSL (3.4.5 or later), available from the OpenSSL Web site at http://www.openssl.org/ |
| Related URL |
CVE-2026-28387,CVE-2026-28388,CVE-2026-28389,CVE-2026-28390,CVE-2026-31789,CVE-2026-31790 (CVE) |
| Related URL |
(SecurityFocus) |
| Related URL |
(ISS) |
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