What’s Vulnerable › Vulnerabilities

CVE-2026-59886: pyasn1: Uncontrolled resource consumption when converting decoded REAL values

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-14 · updated 2026-07-21
• Weakness: CWE-400

Description

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, log, or compare decoded objects. This issue is fixed in version 0.6.4.

Affected products

• pyasn1: before 0.6.4 — fixed in 0.6.4

How to fix

Upgrade to a fixed version: pyasn1 0.6.4. Check the vendor advisory for mitigations.

References

• https://github.com/pyasn1/pyasn1/commit/e60c691cb91addb8fcefa2f537e85ede6fb1e886
• https://github.com/pyasn1/pyasn1/releases/tag/v0.6.4
• https://github.com/pyasn1/pyasn1/security/advisories/GHSA-hm4w-wwcw-mr6r

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