VULNERABILITY INTELLIGENCE

CVE-2026-59886

CVSS score7.5 HIGH
EPSS probability0.62%
CISA KEVNot currently listed
Published2026-07-14
Last modified2026-07-21
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Description

pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.4, the univ.Real type converted its mantissa, base, and exponent value to a Python float using exact big-integer exponentiation. A BER, CER, or DER encoded REAL value only a few bytes long can carry a very large exponent, causing float conversion through prettyPrint(), str(), comparison, arithmetic, int(), or an explicit float() call to consume excessive CPU and memory and hang applications that decode untrusted ASN.1 data and then print, log, or compare decoded objects. This issue is fixed in version 0.6.4.

Weakness classification

  • security-advisories@github.com: CWE-400

Primary references