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CVE-2026-59886

pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.4, the univ.Real type converted its mantissa, base, and exponent value to a Python float using exact big-integer exponentiation. A BER, CER, or DER encoded REAL value only a few bytes long can carry a very large exponent, causing float conversion through prettyPrint(), str(), comparison, arithmetic, int(), or an explicit float() call to consume excessive CPU and memory and hang applications that decode untrusted ASN.1 data and then print
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:f96918c32663db48337b77f9570a492a17d9ab8df4598b9d2fcf074740d47a2d
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:v2:2e7fc0db7b0844eaa03401f65064e383e11b59033a0e659f587e772770562a5c · sha256:04ef410fd8dffcd2… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-770","description":"CWE-770: Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:2e7fc0db7b0844eaa03401f65064e383e11b59033a0e659f587e772770562a5c · sha256:04ef410fd8dffcd2… · /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:v2:2e7fc0db7b0844eaa03401f65064e383e11b59033a0e659f587e772770562a5c · sha256:04ef410fd8dffcd2… · /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:v2:2e7fc0db7b0844eaa03401f65064e383e11b59033a0e659f587e772770562a5c · sha256:04ef410fd8dffcd2… · /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:v2:2e7fc0db7b0844eaa03401f65064e383e11b59033a0e659f587e772770562a5c · sha256:04ef410fd8dffcd2… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-770","description":"CWE-770: Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:2e7fc0db7b0844eaa03401f65064e383e11b59033a0e659f587e772770562a5c · sha256:04ef410fd8dffcd2… · /containers/cna/problemTypes/1/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/pyasn1/pyasn1/commit/e60c691cb91addb8fcefa2f537e85ede6fb1e886","tags":["x_refsource_MISC"],"url":"https://github.com/pyasn1/pyasn1/commit/e60c691cb91addb8fcefa2f537e85ede6fb1e886"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2e7fc0db7b0844eaa03401f65064e383e11b59033a0e659f587e772770562a5c · sha256:04ef410fd8dffcd2… · /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:v2:2e7fc0db7b0844eaa03401f65064e383e11b59033a0e659f587e772770562a5c · sha256:04ef410fd8dffcd2… · /containers/cna/references/2
{"name":"https://github.com/pyasn1/pyasn1/security/advisories/GHSA-hm4w-wwcw-mr6r","tags":["x_refsource_CONFIRM"],"url":"https://github.com/pyasn1/pyasn1/security/advisories/GHSA-hm4w-wwcw-mr6r"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2e7fc0db7b0844eaa03401f65064e383e11b59033a0e659f587e772770562a5c · sha256:04ef410fd8dffcd2… · /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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