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Vulnerability record · CVE-2017-12973 · published 20 August 2017

CVE-2017-12973: Connect2id nimbus jose\+jwt vulnerability

Connect2id · Nimbus Jose\+Jwt

Nimbus JOSE+JWT before 4.39 proceeds improperly after detection of an invalid HMAC in authenticated AES-CBC decryption, which allows attackers to conduct a padding oracle attack.

3.1 CVSS 3.0 Low EPSS 0.64% · top 50.7% CWE-354 · CWE-354
3.1CVSS 3.0 base score, v2 4.3
0.64%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

Nimbus JOSE+JWT before 4.39 proceeds improperly after detection of an invalid HMAC in authenticated AES-CBC decryption, which allows attackers to conduct a padding oracle attack.

CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bitbucket.org/connect2id/nimbus-jose-jwt/commits/6a29f10f723f406eb25555f55842c59a43a38912 PatchThird Party Advisory
https://bitbucket.org/connect2id/nimbus-jose-jwt/issues/223/aescbc-return-immediately-on-invalid-hmac Third Party Advisory
https://bitbucket.org/connect2id/nimbus-jose-jwt/src/master/CHANGELOG.txt Release NotesThird Party Advisory
https://bitbucket.org/connect2id/nimbus-jose-jwt/commits/6a29f10f723f406eb25555f55842c59a43a38912 PatchThird Party Advisory
https://bitbucket.org/connect2id/nimbus-jose-jwt/issues/223/aescbc-return-immediately-on-invalid-hmac Third Party Advisory
https://bitbucket.org/connect2id/nimbus-jose-jwt/src/master/CHANGELOG.txt Release NotesThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2019-17195Connect2id nimbus jose\+jwt vulnerabilityConnect2id Nimbus JOSE+JWT before v7.9 can throw various uncaught exceptions while parsing a JWT, which could result in an application crash (potenti…EPSS 11%7.5CVE-2023-52428Connect2id nimbus jose\+jwt allocation without limits vulnerabilityIn Connect2id Nimbus JOSE+JWT before 9.37.2, an attacker can cause a denial of service (resource consumption) via a large JWE p2c header value (aka i…EPSS 0.81%7.5CVE-2017-12972Connect2id nimbus jose\+jwt insufficient verification of data authenticity vulnerabilityIn Nimbus JOSE+JWT before 4.39, there is no integer-overflow check when converting length values from bytes to bits, which allows attackers to conduc…EPSS 0.89%7.5CVE-2017-12974Connect2id nimbus jose\+jwt improper verification of cryptographic signature vulnerabilityNimbus JOSE+JWT before 4.36 proceeds with ECKey construction without ensuring that the public x and y coordinates are on the specified curve, which a…EPSS 1.3%

Source: NIST National Vulnerability Database (record CVE-2017-12973), CISA KEV, FIRST EPSS (scores of 2026-10-14). This page is refreshed as NVD updates the record.