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High 7.5Published Jan 16, 2026

CVE-2026-23490pyasn1 has a DoS vulnerability in decoder

Updated under an hour ago ()

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It affects pyasn1 and 28 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.2, a Denial-of-Service issue has been found that leads to memory exhaustion from malformed RELATIVE-OID with excessive continuation octets. This vulnerability is fixed in 0.6.2.

CVSS
7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE)
CWE-770
Known exploited
Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days)
Not loaded for this CVE
Assigned by
GitHub_M
NVD analysis
Modified
Record last updated
Sep 17, 2026
First seen by InfoSec Signals
Oct 9, 2026

Affected products

Affected products
pyasn1 pyasn1
pyasn1:pyasn1 (from the name)
before 0.6.2
CNA record
from 0:0.6.3-1.el8ap not affected
CISA ADP
from 0:4.16.0-13.el10_1.2 not affected
CISA ADP
from 0:4.16.0-5.el10_0.8 not affected
CISA ADP
from 0:4.1.1-61.el7_9.23 not affected
CISA ADP
from 0:0.1.9-7.el7_9.2 not affected
CISA ADP
from 0:0.3.7-6.el8_2.1 not affected
CISA ADP
from 0:4.2.1-65.el8_4.27 not affected
CISA ADP
from 0:4.2.1-89.el8_6.21 not affected
CISA ADP
from 0:4.2.1-89.el8_6.21 not affected
CISA ADP

References

References

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.

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