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Permalink CVE-2026-59886

7.5 HIGH

CVSS version (CVSS): 3.1
Attack Vector (AV): Network (N)
Attack Complexity (AC): Low (L)
Privileges Required (PR): None (N)
User Interaction (UI): None (N)
Scope (S): Unchanged (U)
Confidentiality (C): None (N)
Integrity (I): None (N)
Availability (A): High (H)
Modified Attack Vector (MAV): Network (N)
Modified Attack Complexity (MAC): Low (L)
Modified Privileges Required (MPR): None (N)
Modified User Interaction (MUI): None (N)
Modified Confidentiality (MC): None (N)
Modified Scope (MS): Unchanged (U)
Modified Integrity (MI): None (N)
Modified Availability (MA): High (H)

created 1 day, 14 hours ago Activity log

Created suggestion 1 day, 14 hours ago

pyasn1: Uncontrolled resource consumption when converting decoded REAL values

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.

References

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

Affected products

pyasn1

==< 0.6.4

Matching in nixpkgs

pkgs.python313Packages.pyasn1

Generic ASN.1 library for Python

nixos-unstable 0.6.3
- nixpkgs-unstable 0.6.3
- nixos-unstable-small 0.6.3
nixos-26.05 0.6.3
- nixos-26.05-small 0.6.3
- nixpkgs-26.05-darwin 0.6.3

pkgs.python314Packages.pyasn1

Generic ASN.1 library for Python

nixos-unstable 0.6.3
- nixpkgs-unstable 0.6.3
- nixos-unstable-small 0.6.3
nixos-26.05 0.6.3
- nixos-26.05-small 0.6.3
- nixpkgs-26.05-darwin 0.6.3

pkgs.python313Packages.pysnmp-pyasn1

Python ASN.1 encoder and decoder

nixos-unstable 1.1.3
- nixpkgs-unstable 1.1.3
- nixos-unstable-small 1.1.3
nixos-26.05 1.1.3
- nixos-26.05-small 1.1.3
- nixpkgs-26.05-darwin 1.1.3

pkgs.python314Packages.pysnmp-pyasn1

Python ASN.1 encoder and decoder

nixos-unstable 1.1.3
- nixpkgs-unstable 1.1.3
- nixos-unstable-small 1.1.3
nixos-26.05 1.1.3
- nixos-26.05-small 1.1.3
- nixpkgs-26.05-darwin 1.1.3

pkgs.python313Packages.pyasn1-modules

Collection of ASN.1-based protocols modules

nixos-unstable 0.4.2
- nixpkgs-unstable 0.4.2
- nixos-unstable-small 0.4.2
nixos-26.05 0.4.2
- nixos-26.05-small 0.4.2
- nixpkgs-26.05-darwin 0.4.2

pkgs.python314Packages.pyasn1-modules

Collection of ASN.1-based protocols modules

nixos-unstable 0.4.2
- nixpkgs-unstable 0.4.2
- nixos-unstable-small 0.4.2
nixos-26.05 0.4.2
- nixos-26.05-small 0.4.2
- nixpkgs-26.05-darwin 0.4.2

Package maintainers

@fabaff Fabian Affolter <mail@fabian-affolter.ch>