------------------------------------------------------------------------- Debian LTS Advisory DLA-4778-1 [email protected] https://www.debian.org/lts/security/ Emmanuel Arias September 09, 2026 https://wiki.debian.org/LTS -------------------------------------------------------------------------
Package : pyasn1
Version : 0.4.8-3+deb12u3
CVE ID : CVE-2026-59884 CVE-2026-59885 CVE-2026-59886
Debian Bug : 1142388
It was discovered that pyasn1, a generic ASN.1 library for Python, is prone to
denial of service vulnerabilities, which may result in excessive CPU and memory
consumption
CVE-2026-59884
BER/CER/DER decoder denial of service via unbounded long-form tag IDs. The
BER decoder accumulated tag continuation octets without an upper bound, so a
crafted substrate could force construction of an arbitrarily large integer
with quadratic CPU cost.
CVE-2026-59885
fix quadratic complexity in OBJECT IDENTIFIER and RELATIVE-OID decoding and
encoding, which allowed denial of service via a small payload with many
arcs.
CVE-2026-59886
uncontrolled resource consumption when converting decoded real values.
univ.Real convertedts mantissa, base, exponens to a Python float using exact
big-integer exponentiation, so a real value only a few bytes long could
carry a very large exponent.
For Debian 12 bookworm, these problems have been fixed in version
0.4.8-3+deb12u3.
We recommend that you upgrade your pyasn1 packages.
For the detailed security status of pyasn1 please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/pyasn1
Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
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