pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.4, the BER, CER, and DER decoders process OBJECT IDENTIFIER and RELATIVE-OID values in quadratic time relative to the number of arcs, so a small crafted payload containing an OID with many arcs consumes excessive CPU per decode() call and can deny service to applications that decode untrusted ASN.1 data. The corresponding encoders have the same quadratic behavior when an application re-encodes previously decoded attacker-supplied values. This issue is fixed in version 0.6.4.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade python2-pyasn1Upgrade python2-pyasn1-modulesUpgrade python3-pyasn1-modulesUpgrade python3-pyasn1 | Aug 5, 2026 | Aug 5, 2026 |
| Debian | — | Upgrade pyasn1 | Sep 21, 2026 | Jul 14, 2026 |
| Redhat_linux | — | No solution exists | Jul 23, 2026 | Jul 14, 2026 |
| Ubuntu | — | Upgrade python3-pyasn1 | Sep 2, 2026 | Sep 1, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Aug 10, 2026 | Jul 14, 2026 |
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