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Ubuntu Security NoticesUSN-8712-1

USN-8712-1: pyasn1 vulnerabilities

It was discovered that pyasn1 did not properly bound the size of long-form tag identifiers when parsing BER, CER, or DER encoded data. An attacker could possibly use this issue to cause applications decoding untrusted ASN.1 data to consume excessive CPU resources, resulting in a denial of service. (CVE-2026-59884) It was discovered that pyasn1 processed OBJECT IDENTIFIER and RELATIVE-OID values in quadratic time relative to the number of arcs. An attacker could possibly use this issue to cause applications decoding untrusted ASN.1 data to consume excessive CPU resources, resulting in a denial of service. (CVE-2026-59885) It was discovered that pyasn1 incorrectly handled conversion of decoded REAL values to Python float types. An attacker could possibly use this issue to cause applications decoding untrusted ASN.1 data to consume excessive CPU and memory resources, resulting in a denial of service. (CVE-2026-59886)

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Vulnerabilities

CVEs named in this advisory

CVE-2026-59884View CVSS, KEV, EPSS, and threat contextCVE-2026-59885View CVSS, KEV, EPSS, and threat contextCVE-2026-59886View CVSS, KEV, EPSS, and threat context
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