CVE-2026-103001— PyJWT.decode() reintroduces options-dict mutation, enabling silent claim-verification bypass on dict reuse
Quick assessment
Affected
jpadilla pyjwt
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
PyJWT 是 JSON Web Token（JWT）标准的 Python 实现。在 PyJWT 2.11.0 至 2.13.0 版本中，当 参数设置为 时，PyJWT 的 方法可能会修改调用者传入的可变选项映射（mutable options mapping）。如果应用程序在后续的 或 调用中复用该映射，并将 更改为 ，则该映射可能仍保留对过期时间（expiration）、生效前时间（not-before）、签发时间（issued-at）、受众（audience）、颁发者（issuer）、主题（subject）以
Possible ATT&CK Techniques 1 AI
T1567 · Exfiltration Over Web Service
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I. Basic Information for CVE-2026-103001
Vulnerability Information
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Vulnerability Title
PyJWT.decode() reintroduces options-dict mutation, enabling silent claim-verification bypass on dict reuse
Source: CVE Program / CVE List V5
Vulnerability Description
PyJWT is a Python implementation of JSON Web Token standards. From 2.11.0 through 2.13.0, PyJWT's PyJWT._merge_options() method can modify a caller-supplied mutable options mapping when verify_signature is false. If an application reuses that same mapping for a later decode() or decode_complete() call and changes verify_signature to true, the mapping can retain false values for expiration, not-before, issued-at, audience, issuer, subject, and JWT ID checks. A signed token with invalid registered claims can then be accepted without disabling signature verification, but applications that create a fresh options mapping for each call are not affected.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对假设不可变数据的修改(MAID)
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-103001
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Patches & Fixes for CVE-2026-103001 (1)
Vendor Advisories for CVE-2026-103001 (1)
Other References for CVE-2026-103001 (1)
IV. Related Vulnerabilities
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V. Comments for CVE-2026-103001
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