MGASA-2026-0380
Advisory lineage Upstream: 3 Downstream: 0
Published: 07 Sept 2026, 18:46
Last modified:07 Sept 2026, 19:00
Vulnerability Summary
Overall Risk (default)
minimal
0/100 CVSS Score
No data
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected
Timeline
07 Sept 2026, 18:46
Published
Vulnerability first disclosed
07 Sept 2026, 19:00
Last Modified
Vulnerability information updated
Description
Updated python-pyasn1 packages fix security vulnerabilities The BER decoder (shared by the CER and DER codecs) parses long-form tags by accumulating continuation octets in a loop with no upper bound on the size of the tag ID. A crafted input can force the decoder to build an arbitrarily large integer, with CPU cost growing quadratically in input size — a ~1 MB input consumes over a minute of CPU. On Python 3.11+, the oversized tag ID can also trigger an unhandled ValueError (integer string conversion limit) while the decoder formats error messages, violating the documented PyAsn1Error contract and potentially bypassing caller error handling.
Affected Systems
- mageia•python-pyasn1
< 0.6.4-1.mga10