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QSN-8934-1: PyJWT vulnerabilities

October 19, 2026

Summary

Several security issues were fixed in PyJWT.

Details

Kingsley Olukanni discovered that PyJWT did not properly handle unknown key identifiers when retrieving signing keys. An attacker could possibly use this issue to amplify requests to the configured key endpoint, resulting in a denial of service. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, Ubuntu 26.04 LTS and Ubuntu 26.10. (CVE-2026-101917)

Ekalabya Ghosh discovered that PyJWT did not properly handle certain recursively nested JSON payloads. An attacker could possibly use this issue to cause an application to fail, resulting in a denial of service. (CVE-2026-101918)

Pedram Hayati discovered that PyJWT did not properly handle malformed RSA keys in a JSON Web Key Set. An attacker could possibly use this issue to cause authentication failures or a denial of service. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, Ubuntu 26.04 LTS and Ubuntu 26.10. (CVE-2026-102274)

It was discovered that PyJWT did not properly validate certain OKP private key components. An attacker could possibly use this issue to confuse the identity of public and private keys, and use a stolen sender-constrained token without the legitimate private key. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, Ubuntu 26.04 LTS and Ubuntu 26.10. (CVE-2026-102275)

Affected QuantaStor releases

ReleasePlatformPackageExposureShipped versionFixed versionStatus
6.9.1.001Ubuntu 22.04 LTSpython3-jwtExternally-facing2.3.0-1ubuntu0.62.3.0-1ubuntu0.6Fixed in this release
6.9.0.464Ubuntu 22.04 LTSpython3-jwtExternally-facing2.3.0-1ubuntu0.52.3.0-1ubuntu0.6Fixed by QuantaStor security update
6.8.6.015Ubuntu 22.04 LTSpython3-jwtExternally-facing2.3.0-1ubuntu0.32.3.0-1ubuntu0.6Fixed by QuantaStor security update
6.8.5.018Ubuntu 22.04 LTSpython3-jwtExternally-facing2.3.0-1ubuntu0.32.3.0-1ubuntu0.6Fixed by QuantaStor security update
6.8.4.038Ubuntu 22.04 LTSpython3-jwtExternally-facing2.3.0-1ubuntu0.32.3.0-1ubuntu0.6Fixed by QuantaStor security update
6.8.3.018Ubuntu 22.04 LTSpython3-jwtExternally-facing2.3.0-1ubuntu0.32.3.0-1ubuntu0.6Fixed by QuantaStor security update
6.8.2.002Ubuntu 22.04 LTSpython3-jwtExternally-facing2.3.0-1ubuntu0.32.3.0-1ubuntu0.6Fixed by QuantaStor security update
6.8.1.007Ubuntu 22.04 LTSpython3-jwtExternally-facing2.3.0-1ubuntu0.32.3.0-1ubuntu0.6Fixed by QuantaStor security update
6.8.0.205Ubuntu 22.04 LTSpython3-jwtExternally-facing2.3.0-1ubuntu0.32.3.0-1ubuntu0.6Fixed 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-2026-101918, CVE-2026-102275, CVE-2026-102274, CVE-2026-101917

References

https://ubuntu.com/security/notices/USN-8934-1

https://nvd.nist.gov/vuln/detail/CVE-2026-101918

https://nvd.nist.gov/vuln/detail/CVE-2026-102275

https://nvd.nist.gov/vuln/detail/CVE-2026-102274

https://nvd.nist.gov/vuln/detail/CVE-2026-101917

Update

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

PlatformPackageVersion
bionicpyjwt1.5.3+ds1-1ubuntu0.1+esm4
Ubuntu 20.04 LTSpyjwt1.7.1-2ubuntu2.1+esm4
Ubuntu 22.04 LTSpyjwt2.3.0-1ubuntu0.6
Ubuntu 24.04 LTSpyjwt2.7.0-1ubuntu0.4
resolutepyjwt2.10.1-4ubuntu1.3
stonkingpyjwt2.13.0-1ubuntu1.1
xenialpyjwt1.3.0-1ubuntu0.1+esm4