DEBIAN-CVE-2026-59884
pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.4, the BER decoder shared by the CER and DER codecs parses long-form tags by accumulating continuation octets without an upper bound on the tag ID size, allowing a crafted input to force construction of an arbitrarily large integer with CPU cost growing quadratically and to trigger unhandled ValueError exceptions in Python 3.11+ error formatting paths. Any application decoding untrusted BER, CER, or DER input is affected. This issue is fixed in version 0.6.4.
DEBIAN-CVE-2026-59884
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-2026-59884
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-2026-59884.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-2026-59884.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-2026-59884.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #58035 · Revision 1
- Added to Heist Feed
- Publisher date