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CVE-2026-48526

Pyjwt authentication bypass

7.4 HIGHPublic exploitEPSS 0.43%
  1. Published28 May 2026

Description

PyJWT is a JSON Web Token implementation in Python. Prior to 2.13.0, when the verifier is decoding JSON Web Tokens, while supporting both asymmetric and HMAC algorithms, the library does not validate use of JSON Web Keys in HMAC algorithm, allowing attacker to use the issuer public key as the secret key for HMAC algorithm. This vulnerability is fixed in 2.13.0.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityHigh
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

Pyjwt< 2.13.0

Remediation

Fixed in
Pyjwt≥ 2.13.0

References

and 28 more references

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Frequently asked

Is CVE-2026-48526 being actively exploited?

CVE-2026-48526 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.43%.

How severe is CVE-2026-48526?

CVE-2026-48526 has a CVSS 3.1 base score of 7.4, rated high. EPSS estimates a 0.43% probability of exploitation.

Which products are affected by CVE-2026-48526?

Affected products include Pyjwt.

How do I fix CVE-2026-48526?

Upgrade affected software to a fixed version, for example Pyjwt 2.13.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-48526 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.