| Name | CVE-2026-59886 |
| 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. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 1142388 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| pyasn1 (PTS) | bullseye | 0.4.8-1 | vulnerable |
| bullseye (security) | 0.4.8-1+deb11u2 | vulnerable | |
| bookworm, bookworm (security) | 0.4.8-3+deb12u2 | vulnerable | |
| trixie (security), trixie | 0.6.1-1+deb13u2 | vulnerable | |
| forky, sid | 0.6.4-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| pyasn1 | source | (unstable) | 0.6.4-1 | 1142388 |
https://github.com/pyasn1/pyasn1/security/advisories/GHSA-hm4w-wwcw-mr6r
Fixed by: https://github.com/pyasn1/pyasn1/commit/e60c691cb91addb8fcefa2f537e85ede6fb1e886 (v0.6.4)