high7.5
CVE-2026-59886
pyasn1: Uncontrolled resource consumption when converting decoded REAL values
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | pyasn1 | <= 0.6.3 | 0.6.4 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Pyasn1 | Pyasn1 | before 0.6.4 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-hm4w-wwcw-mr6r
- https://github.com/pyasn1/pyasn1/security/advisories/GHSA-hm4w-wwcw-mr6r
- https://nvd.nist.gov/vuln/detail/CVE-2026-59886
- https://github.com/pyasn1/pyasn1/commit/e60c691cb91addb8fcefa2f537e85ede6fb1e886
- https://github.com/pyasn1/pyasn1/releases/tag/v0.6.4