HIGHPyPI →
pyasn1 BER/CER/DER decoder denial of service via unbounded long-form tag IDs
pyasn1 BER/CER/DER decoder denial of service via unbounded long-form tag IDs
Affected packages
- pyasn1— before 0.6.4
Exploit signal
- Known exploited (CISA KEV)
- No
- EPSS score
- 0.35%
- EPSS percentile
- 27.6%
EPSS is the probability a CVE is exploited in the wild; percentile is its rank among all CVEs. This advisory is in the top 28%.
Sources
- https://github.com/pyasn1/pyasn1/security/advisories/GHSA-m4p7-r5rc-7g4j
- https://nvd.nist.gov/vuln/detail/CVE-2026-59884
- https://github.com/pyasn1/pyasn1/commit/628e36ecbb5277a3f01572ce418ef54271b165a5
- https://github.com/pyasn1/pyasn1
- https://github.com/pyasn1/pyasn1/releases/tag/v0.6.4
- https://github.com/pypa/advisory-database/tree/main/vulns/pyasn1/PYSEC-2026-3455.yaml
Structured record: https://osv.dev/vulnerability/GHSA-m4p7-r5rc-7g4j
Recommended response stack
Snyk — Scan your dependencies in CI and fix this vulnerability.→Socket — Detect malicious and compromised packages before they ship.→
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