DEBIAN-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, log, or compare decoded objects. This issue is fixed in version 0.6.4.
DEBIAN-CVE-2026-59886
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-59886
pyasn1
Source reference: /affected/0/package/name
- Affected versions
- 0.4.8-3
Source reference:
/affected/0/versions0.4.8-3+deb12u1Source reference:
/affected/0/versions0.4.8-3+deb12u2Source reference:
/affected/0/versions - Fixed versions
- 0.4.8-3+deb12u3
Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
pyasn1
Source reference: /affected/1/package/name
- Affected versions
- 0.6.1-1
Source reference:
/affected/1/versions0.6.1-1+deb13u1Source reference:
/affected/1/versions0.6.1-1+deb13u2Source reference:
/affected/1/versions - Fixed versions
- 0.6.1-1+deb13u3
Source reference:
/affected/1/ranges - Prerequisites
- Not stated in this record
pyasn1
Source reference: /affected/2/package/name
- Affected versions
- 0.6.1-1
Source reference:
/affected/2/versions0.6.2-1Source reference:
/affected/2/versions0.6.2-1~bpo13+1Source reference:
/affected/2/versions0.6.3-1Source reference:
/affected/2/versions0.6.4-1~bpo13+1Source reference:
/affected/2/versions - Fixed versions
- 0.6.4-1
Source reference:
/affected/2/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.4.8-3+deb12u3"
}
]
}
],
"package": {
"name": "pyasn1",
"purl": "pkg:deb/debian/pyasn1?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"0.4.8-3",
"0.4.8-3+deb12u1",
"0.4.8-3+deb12u2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-59886.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.6.1-1+deb13u3"
}
]
}
],
"package": {
"name": "pyasn1",
"purl": "pkg:deb/debian/pyasn1?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"0.6.1-1",
"0.6.1-1+deb13u1",
"0.6.1-1+deb13u2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-59886.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.6.4-1"
}
]
}
],
"package": {
"name": "pyasn1",
"purl": "pkg:deb/debian/pyasn1?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"0.6.1-1",
"0.6.2-1",
"0.6.2-1~bpo13+1",
"0.6.3-1",
"0.6.4-1~bpo13+1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-59886.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #58049 · Revision 1
- Added to Heist Feed
- Publisher date