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CVE-2026-59885

pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.4, the BER, CER, and DER decoders process OBJECT IDENTIFIER and RELATIVE-OID values in quadratic time relative to the number of arcs, so a small crafted payload containing an OID with many arcs consumes excessive CPU per decode() call and can deny service to applications that decode untrusted ASN.1 data. The corresponding encoders have the same quadratic behavior when an application re-encodes previously decoded attacker-supplied values.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:2aac1e0d69a4f9fd3929fbb4dce8704eb470754de0ebaf7c26d7b4e0c24f8a29
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-400","description":"CWE-400: Uncontrolled Resource Consumption","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:83edfca9ec8a1734e6343e1e473f915d676006a63831a73e7998cabb0a4a6670 · sha256:2f5d5c95ddb4292e… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-407","description":"CWE-407: Inefficient Algorithmic Complexity","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:83edfca9ec8a1734e6343e1e473f915d676006a63831a73e7998cabb0a4a6670 · sha256:2f5d5c95ddb4292e… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"product":"pyasn1","vendor":"pyasn1","versions":[{"status":"affected","version":"< 0.6.4"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:83edfca9ec8a1734e6343e1e473f915d676006a63831a73e7998cabb0a4a6670 · sha256:2f5d5c95ddb4292e… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:83edfca9ec8a1734e6343e1e473f915d676006a63831a73e7998cabb0a4a6670 · sha256:2f5d5c95ddb4292e… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-400","description":"CWE-400: Uncontrolled Resource Consumption","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:83edfca9ec8a1734e6343e1e473f915d676006a63831a73e7998cabb0a4a6670 · sha256:2f5d5c95ddb4292e… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-407","description":"CWE-407: Inefficient Algorithmic Complexity","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:83edfca9ec8a1734e6343e1e473f915d676006a63831a73e7998cabb0a4a6670 · sha256:2f5d5c95ddb4292e… · /containers/cna/problemTypes/1/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/pyasn1/pyasn1/commit/45bdb19eb7df4b3780fe9c912c63e99bffc39dd9","tags":["x_refsource_MISC"],"url":"https://github.com/pyasn1/pyasn1/commit/45bdb19eb7df4b3780fe9c912c63e99bffc39dd9"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:83edfca9ec8a1734e6343e1e473f915d676006a63831a73e7998cabb0a4a6670 · sha256:2f5d5c95ddb4292e… · /containers/cna/references/1
{"name":"https://github.com/pyasn1/pyasn1/releases/tag/v0.6.4","tags":["x_refsource_MISC"],"url":"https://github.com/pyasn1/pyasn1/releases/tag/v0.6.4"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:83edfca9ec8a1734e6343e1e473f915d676006a63831a73e7998cabb0a4a6670 · sha256:2f5d5c95ddb4292e… · /containers/cna/references/2
{"name":"https://github.com/pyasn1/pyasn1/security/advisories/GHSA-8ppf-4f7h-5ppj","tags":["x_refsource_CONFIRM"],"url":"https://github.com/pyasn1/pyasn1/security/advisories/GHSA-8ppf-4f7h-5ppj"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:83edfca9ec8a1734e6343e1e473f915d676006a63831a73e7998cabb0a4a6670 · sha256:2f5d5c95ddb4292e… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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