VYPR
← All advisories
High severity7.5NVD Advisory· Published Jul 14, 2026· Updated Jul 21, 2026

CVE-2026-59886

CVE-2026-59886

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.

Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
pyasn1PyPI
< 0.6.40.6.4

Affected products

135

Patches

Vulnerability mechanics

References

5

News mentions

0

No linked articles in our index yet.