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This CVE record has been updated after NVD enrichment efforts were completed. Enrichment data supplied by the NVD may require amendment due to these changes.
Description
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.
Metrics
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Title: OpenSSL, Description: Resumen del problema: La conversión de un valor OCTET STRING excesivamente grande a una cadena hexadecimal conduce a un desbordamiento de búfer de montón en plataformas de 32 bits.
Resumen del impacto: Un desbordamiento de búfer de montón puede conducir a un fallo o posiblemente a una ejecución de código controlada por un atacante u otro comportamiento indefinido.
Si un atacante puede proporcionar un certificado X.509 manipulado con un valor OCTET STRING excesivamente grande en extensiones como el Identificador de Clave de Sujeto (SKID) o el Identificador de Clave de Autoridad (AKID) que se están convirtiendo a hexadecimal, el tamaño del búfer necesario para el resultado se calcula como la multiplicación de la longitud de entrada por 3. En plataformas de 32 bits, esta multiplicación puede desbordarse, lo que resulta en la asignación de un búfer más pequeño y un desbordamiento de búfer de montón.
Las aplicaciones y servicios que imprimen o registran contenidos de certificados X.509 no confiables son vulnerables a este problema. Dado que los certificados tendrían que tener tamaños de más de 1 Gigabyte, imprimir o registrar dichos certificados es una operación bastante improbable y solo las plataformas de 32 bits se ven afectadas, a este problema se le asignó una severidad Baja.
Los módulos FIPS en 3.6, 3.5, 3.4, 3.3 y 3.0 no se ven afectados por este problema, ya que el código afectado está fuera del límite del módulo FIPS de OpenSSL.
OR
*cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:* versions from (including) 3.0.0 up to (excluding) 3.0.20
*cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:* versions from (including) 3.3.0 up to (excluding) 3.3.7
*cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:* versions from (including) 3.4.0 up to (excluding) 3.4.5
*cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:* versions from (including) 3.5.0 up to (excluding) 3.5.6
*cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:* versions from (including) 3.6.0 up to (excluding) 3.6.2
New CVE Received from OpenSSL Software Foundation4/07/2026 6:16:21 PM
Action
Type
Old Value
New Value
Added
Description
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.
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