7.5
High
CVE-2026-59884 pyasn1 is a generic ASN.1 library for Python
Description
pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.4, the BER decoder shared by the CER and DER codecs parses long-form tags by accumulating continuation octets without an upper bound on the tag ID size, allowing a crafted input to force construction of an arbitrarily large integer with CPU cost growing quadratically and to trigger unhandled ValueError exceptions in Python 3.11+ error formatting paths. Any application decoding untrusted BER, CER, or DER input is affected. This issue is fixed in version 0.6.4.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| pyasn1 0.6 | earliest → < 0.6.4 | 0.6.4 |
References
- github.com github.com
- github.com github.com
- github.com github.com
Timeline
- Published
- Last modified
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The 9 CVEs of pyasn1 →
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CVE-2026-119195
pyasn1 is a generic ASN.1 library for Python
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CVE-2026-119194
pyasn1 is a generic ASN.1 library for Python
7.5
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