CVE-2026-103001

PyJWT.decode() reintroduces options-dict mutation, enabling silent claim-verification bypass on dict reuse

CVE-2026-103001 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-103001, released October 4, 2026. It is not reported as exploited. Patch Radar priority: Routine.

Routine

CVSS

6.5

Moderate

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0026

17th percentile

reused mutable options mapping can cause verification checks bypass on subsequent decode calls

Where it's fixed

Product	Fixed in	Fix	Released
Linux
pyjwt · Debian 14	2.14.0-1	DEBIAN-CVE-2026-103001	Oct 4, 2026
python-PyJWT · opensuse-leap 16.0	2.12.1-160000.3.1	OPENSUSE-SU-2026:22074-1	Nov 7, 2026
python-PyJWT · sles 16.0	2.12.1-160000.3.1	SUSE-SU-2026:24219-1	Nov 7, 2026

Details

Published
September 30, 2026
Weakness
Modification of Assumed-Immutable Data (MAID)
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-103001

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