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CVE-2026-59886

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-59886

Severity

7.5

High

CVSS V3

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Summary

pyasn1: Uncontrolled resource consumption when converting decoded REAL values

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.

References

Affected packages

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