PyPI
pyasn1
Pure-Python implementation of ASN.1 types and DER/BER/CER codecs (X.208)
github.com/pyasn1/pyasn1BSD-2-Clausepyasn1 maintenance organization118M / week53 · 51 forks · 31 contributors
Release cadenceEvery 4 months
Last releaseOct 27, 2026
Open advisories0
Changelog quality100% curated
CHANGELOG + GitHub Releases
Release history SecurityYou're on
35 older or filtered releases not shown.
Upgrade guides
Breaking changes and a migration checklist for each major versionpyasn1 0.5 → 0.60.5.1 → 0.6.5Oct 27, 2026 BreakingSecurity9Platform3New1Fixed3Other6pyasn1 0.4 → 0.50.4.8 → 0.5.1Nov 20, 2023 BreakingPlatform2New1Changed2Fixed1Other4pyasn1 0.3 → 0.40.3.7 → 0.4.8Nov 16, 2019 BreakingBreaking3Deprecated1New12Changed7Fixed13Other5pyasn1 0.2 → 0.30.2.3 → 0.3.7Oct 4, 2017 BreakingBreaking8New1Changed22Fixed29Other2pyasn1 0.1 → 0.20.1.9 → 0.2.3Feb 25, 2017 BreakingBreaking3Security3New9Changed13Fixed11Other6pyasn1 0.0 → 0.10.0.13 → 0.1.9Sep 28, 2015 BreakingBreaking4Security1New19Changed14Fixed34Other10
VersionChannelDateChangesSecurity
0.6.5 StableOct 27, 2026Security4Fix0.6.4 StableJul 9, 2026Security3Other1Fix0.6.3 StableMar 17, 2026Security1Fixed3Fix0.6.2 StableJan 16, 2026Security1Platform1Other2Fix0.6.1 StableSep 10, 2024Platform1Other20.6.0 StableMar 26, 2024Platform1New1Other10.5.1 youStableNov 20, 2023Platform1Fixed1Other10.5.0 StableApr 20, 2023Platform1New1Changed2Other30.4.8 StableNov 16, 2019New10.4.7 StableSep 1, 2019Deprecated1New2Fixed10.4.6 StableJul 31, 2019Breaking1New6Changed1Fixed20.4.5 StableDec 29, 2018Changed2Fixed1Other10.4.4 StableJul 26, 2018Fixed20.4.3 StableMay 23, 2018Fixed1Other10.4.2 StableNov 23, 2017Fixed10.4.1 StableNov 23, 2017Breaking2New3Changed4Fixed5Other30.3.7 StableOct 4, 2017Fixed10.3.6 StableSep 20, 2017Changed2Fixed10.3.5 StableSep 16, 2017Changed4Fixed40.3.4 StableSep 7, 2017Fixed5