Excessive Iteration Affecting pyasn1 package, versions [,0.6.4)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PYTHON-PYASN1-17972379
- published14 Jul 2026
- disclosed14 Jul 2026
- creditmikeappsec
Introduced: 14 Jul 2026
NewCVE-2026-59884 (opens in a new tab)How to fix?
Upgrade pyasn1 to version 0.6.4 or higher.
Overview
Affected versions of this package are vulnerable to Excessive Iteration via the BER decoder, which is also used by the CER and DER codecs, when parsing long-form tag IDs without an upper bound. An attacker can exhaust system resources and potentially trigger unhandled exceptions by submitting specially crafted ASN.1 input with excessively large tag IDs.