CVE-2026-119195 pyasn1 - Denial of Service

pyasn1 < 0.6.5 contains a denial of service caused by quadratic complexity in constructed string and indefinite-length ANY decoding, letting attackers exhaust CPU by sending crafted fragmented BER or CER data, exploit requires attacker to send crafted ASN.1 data.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.53% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
29 October 2026
Updated
31 October 2026
Weakness
CWE-407

Vendor fix

Update to version 0.6.5 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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