CVE-2026-27932: joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOS

This week

HIGH 7.5REMOTEUPGRADE

CVE-2026-27932 is a high-severity flaw (CVSS 7.5) affecting joserfc. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards. In 1.6.2 and earlier, a resource exhaustion vulnerability in joserfc allows an unauthenticated attacker to cause a Denial of Service (DoS) via CPU exhaustion. When the library decrypts a JSON Web Encryption (JWE) token using Password-Based Encryption (PBES2) algorithms, it reads the p2c (PBES2 Count) parameter directly from

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 60%)
CISA exploited list	No
Weakness	CWE-770
Published	2026-03-03
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: hsiaoming

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-03 23:15 UTCPublished CVE record published
2026-06-17 10:27 UTCUpdated Record last modified

hsiaoming joserfc UPGRADE

Affected: <= 1.6.2

Fixed in: newer than 1.6.2

Safe to downgrade to: no unaffected older release

1. Check installed version

pip show joserfc

2. UPGRADE to newer than 1.6.2

pip install --upgrade "joserfc>1.6.2"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-27932?

joserfc: upgrade to newer than 1.6.2. Exact commands for each OS are on this page.

Is CVE-2026-27932 being exploited?

CVE-2026-27932 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-27932 affect?

CVE-2026-27932 affects joserfc. Severity is high (CVSS 7.5). joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards. In 1.6.2 and earlier, a resource exhaustion vulnerability in joserfc allows an unauthenticated attacker to cause a D

How urgent is CVE-2026-27932?

Priority 46/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Python vulnerabilities

Related CVEs

CVE-2025-65015 HIGH 7.5 UPGRADE joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOS

References

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