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QSN-8712-1: pyasn1 vulnerabilities

September 1, 2026

Summary

Several security issues were fixed in pyasn1.

Details

It was discovered that pyasn1 did not properly bound the size of long-form tag identifiers when parsing BER, CER, or DER encoded data. An attacker could possibly use this issue to cause applications decoding untrusted ASN.1 data to consume excessive CPU resources, resulting in a denial of service. (CVE-2026-59884)

It was discovered that pyasn1 processed OBJECT IDENTIFIER and RELATIVE-OID values in quadratic time relative to the number of arcs. An attacker could possibly use this issue to cause applications decoding untrusted ASN.1 data to consume excessive CPU resources, resulting in a denial of service. (CVE-2026-59885)

It was discovered that pyasn1 incorrectly handled conversion of decoded REAL values to Python float types. An attacker could possibly use this issue to cause applications decoding untrusted ASN.1 data to consume excessive CPU and memory resources, resulting in a denial of service. (CVE-2026-59886)

Affected QuantaStor releases

ReleasePlatformPackageExposureShipped versionFixed versionStatus
6.9.1.001Ubuntu 22.04 LTSpython3-pyasn1Externally-facing0.4.8-1ubuntu0.30.4.8-1ubuntu0.3Fixed in this release
6.9.0.464Ubuntu 22.04 LTSpython3-pyasn1Externally-facing0.4.8-1ubuntu0.30.4.8-1ubuntu0.3Fixed in this release
6.8.6.015Ubuntu 22.04 LTSpython3-pyasn1Externally-facing0.4.8-1ubuntu0.30.4.8-1ubuntu0.3Fixed in this release
6.8.5.018Ubuntu 22.04 LTSpython3-pyasn1Externally-facing0.4.8-1ubuntu0.20.4.8-1ubuntu0.3Fixed by QuantaStor security update
6.8.4.038Ubuntu 22.04 LTSpython3-pyasn1Externally-facing0.4.8-1ubuntu0.20.4.8-1ubuntu0.3Fixed by QuantaStor security update
6.8.3.018Ubuntu 22.04 LTSpython3-pyasn1Externally-facing0.4.8-1ubuntu0.20.4.8-1ubuntu0.3Fixed by QuantaStor security update
6.8.2.002Ubuntu 22.04 LTSpython3-pyasn1Externally-facing0.4.8-1ubuntu0.20.4.8-1ubuntu0.3Fixed by QuantaStor security update
6.8.1.007Ubuntu 22.04 LTSpython3-pyasn1Externally-facing0.4.8-1ubuntu0.20.4.8-1ubuntu0.3Fixed by QuantaStor security update
6.8.0.205Ubuntu 22.04 LTSpython3-pyasn1Externally-facing0.4.8-1ubuntu0.20.4.8-1ubuntu0.3Fixed by QuantaStor security update

Internally-facing: only accessible when logged into the QuantaStor console/ssh as the qadmin administrative sudo user; generally lower priority. Externally-facing: part of a service the storage platform presents on the network (or the kernel), so potentially reachable over the network.

CVEs

CVE-2026-59885, CVE-2026-59886, CVE-2026-59884

References

https://ubuntu.com/security/notices/USN-8712-1

https://nvd.nist.gov/vuln/detail/CVE-2026-59885

https://nvd.nist.gov/vuln/detail/CVE-2026-59886

https://nvd.nist.gov/vuln/detail/CVE-2026-59884

Update

Fixes marked Fixed by QuantaStor security update are applied by upgrading QuantaStor with security patches included (Upgrade Manager). Fixed package versions:

PlatformPackageVersion
Ubuntu 22.04 LTSpyasn10.4.8-1ubuntu0.3
Ubuntu 24.04 LTSpyasn10.4.8-4ubuntu0.3
resolutepyasn10.6.3-1ubuntu0.1