Answer in brief
CVE-2026-30922 records a High severity (CVSS 7.5) vulnerability in pyasn1 Vulnerable to Denial of Service via Unbounded Recursion. The current sources do not mark it as known exploited. The current feed maps pyasn1/pyasn1 (generic), pyasn1 (pip), pyasn1 (pypi). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps pyasn1/pyasn1 (generic), pyasn1 (pip), pyasn1 (pypi). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:a:pyasn1:pyasn1:*:*:*:*:*:python:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| pyasn1/pyasn1generic | < 0.6.3 | Not reported |
| pyasn1pip | <=0.6.2 | 0.6.3 |
| pyasn1pypi | >=0 <0.6.3 | 0.6.3 |
Published upstream
Mar 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 15, 2026
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.
Quoted source text, attributed separately from HOL analysis.