CVE-2026-23490
High
Description
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.
SeverityHigh
CVSS7.5
Exploit probability—
Product
Pyasn1
PublishedJan 16, 2026
First seenJan 16, 2026
Weakness typeCWE-770Allocation of resources without limits
How to fix
Update
- pyasn1 pyasn10.6.2 or later
- pyasn10.6.2 or later
Vendor advisories
- access.redhat.com/errata/RHSA-2026:4148
- access.redhat.com/errata/RHSA-2026:2758
- access.redhat.com/errata/RHSA-2026:3959
- access.redhat.com/errata/RHSA-2026:13512
- access.redhat.com/errata/RHSA-2026:54757
- access.redhat.com/errata/RHSA-2026:28042
- access.redhat.com/errata/RHSA-2026:3958
- access.redhat.com/errata/RHSA-2026:13508
- access.redhat.com/errata/RHSA-2026:17595
- access.redhat.com/errata/RHSA-2026:17446
- access.redhat.com/errata/RHSA-2026:2309
- access.redhat.com/errata/RHSA-2026:4138
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| pyasn1 pyasn1 | v < 0.6.2 | 0.6.2 |
| debian debian_linux | 11.0 | — |
| pyasn1PyPI | 0.6.1 ≤ v < 0.6.2 | 0.6.2 |
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