PYSEC-2026-3457

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Import Source

https://github.com/pypa/advisory-database/blob/main/vulns/pyasn1/PYSEC-2026-3457.yaml

JSON Data

https://api.osv.dev/v1/vulns/PYSEC-2026-3457

Aliases

Published

2026-07-14T17:17:15.010Z

Modified

2026-07-22T11:00:08.839691351Z

Severity

7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator

Summary

[none]

Details

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

PyPI / pyasn1

Package

Name: pyasn1; View open source insights on deps.dev
Purl: pkg:pypi/pyasn1

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

0.6.4

Affected versions

0.*

0.0.6a

0.0.9a

0.0.10a

0.0.11a

0.0.12a

0.0.13a

0.0.13b

0.0.13

0.1.1

0.1.2

0.1.3

0.1.4

0.1.5

0.1.6

0.1.7

0.1.8

0.1.9

0.2.1

0.2.2

0.2.3

0.3.1

0.3.2

0.3.3

0.3.4

0.3.5

0.3.6

0.3.7

0.4.1

0.4.2

0.4.3

0.4.4

0.4.5

0.4.6

0.4.7

0.4.8

0.5.0

0.5.1

0.6.0

0.6.1

0.6.2

0.6.3

Database specific

source

"https://github.com/pypa/advisory-database/blob/main/vulns/pyasn1/PYSEC-2026-3457.yaml"