Description
pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.3, the `pyasn1` library is vulnerable to a Denial of Service (DoS) attack caused by uncontrolled recursion when decoding ASN.1 data with deeply nested structures. An attacker can supply a crafted payload containing thousands of nested `SEQUENCE` (`0x30`) or `SET` (`0x31`) tags with "Indefinite Length" (`0x80`) markers. This forces the decoder to recursively call itself until the Python interpreter crashes with a `RecursionError` or consumes all available memory (OOM), crashing the host application. This is a distinct vulnerability from CVE-2026-23490 (which addressed integer overflows in OID decoding). The fix for CVE-2026-23490 (`MAX_OID_ARC_CONTINUATION_OCTETS`) does not mitigate this recursion issue. Version 0.6.3 fixes this specific issue.
INFO
Published Date :
2026-03-18T02:29:45.857Z
Last Modified :
2026-05-01T16:21:04.773Z
Source :
GitHub_M
AFFECTED PRODUCTS
The following products are affected by CVE-2026-30922 vulnerability.
| Vendors | Products |
|---|---|
| Pyasn1 |
|
REFERENCES
Here, you will find a curated list of external links that provide in-depth information to CVE-2026-30922.
