Bug 2500041 (CVE-2026-59886) - CVE-2026-59886 pyasn1: pyasn1: Denial of Service via crafted ASN.1 REAL values
Summary: CVE-2026-59886 pyasn1: pyasn1: Denial of Service via crafted ASN.1 REAL values
Keywords:
Status: NEW
Alias: CVE-2026-59886
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2501248 2501686 2501687 2501688
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-14 17:01 UTC by OSIDB Bzimport
Modified: 2026-07-18 08:28 UTC (History)
99 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-07-14 17:01:42 UTC 
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.
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