CVE-2026-102270

MEDIUM

4.4

CVSS v3

Description

PyJWT is a Python implementation of JSON Web Token standards. Prior to 2.14.0, PyJWT is_pem_format is affected because lazy PEM regular expression backtracks extensively. This occurs when a certificate-like input contains repeated BEGIN markers without a matching END marker. As a result, is_pem_format performs unbounded backtracking while searching for a PEM end marker. Consequently, an attacker can cause intensive CPU consumption. This issue is fixed in version 2.14.0.

CWE-1333

How to fix

Remediation Available

pyjwtDebian

Fixed in:2.14.0-1CVE-2026-102270

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredHigh

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

0.21%probability of exploitation in 30 days

11thpercentile

Low risk: more likely to be exploited than 11% of all known CVEs.

References

Patch2

Release Notes1

github.com

Related Vulnerabilities

Other CWE-1333 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-3364	High	7.5	44%	-	Fix
CVE-2024-8124	High	7.5	40%	-	Fix
CVE-2024-25126	Medium	5.3	35%	-	Fix
CVE-2024-2651	Medium	6.5	33%	-	Fix
CVE-2021-32837	High	7.5	29%	-	Fix
CVE-2024-2829	High	7.5	26%	-	Fix

Common questions

How do I fix CVE-2026-102270?

Upgrade pyjwt on debian unstable to 2.14.0-1 or later.

Is CVE-2026-102270 being actively exploited?

Not that we know of. CVE-2026-102270 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.21% is the estimated probability that it will be exploited in the next 30 days. That is higher than 11% of all scored CVEs.

How severe is CVE-2026-102270?

CVE-2026-102270 has a CVSS v3 base score of 4.4, rated moderate. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-102270 affect?

Published advisories record a fix for pyjwt (Debian). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2026-102270

Markdown

[![CVE-2026-102270](https://tridentstack.com/cve/badge/CVE-2026-102270.svg)](https://tridentstack.com/cve/CVE-2026-102270)

HTML

<a href="https://tridentstack.com/cve/CVE-2026-102270"><img src="https://tridentstack.com/cve/badge/CVE-2026-102270.svg" alt="CVE-2026-102270"></a>

Check your Linux endpoints for this class of vulnerability

TridentStack Control continuously scans Linux endpoints for known vulnerabilities and deploys the fixes from the same console. 200 endpoints free forever, no credit card.

Patch your fleet free Start freeThis CVE lookup is free and always will be.

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-10-06.