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Vulnerability record · CVE-2017-12972 · published 20 August 2017

CVE-2017-12972: Connect2id nimbus jose\+jwt insufficient verification of data authenticity vulnerability

Connect2id · Nimbus Jose\+Jwt

In Nimbus JOSE+JWT before 4.39, there is no integer-overflow check when converting length values from bytes to bits, which allows attackers to conduct HMAC bypass attacks by shifting Additional Authenticated Data (AAD) and ciphertext so that different plaintext is obtained for the same HMAC.

7.5 CVSS 3.0 High EPSS 0.89% · top 41.5% CWE-345 · Insufficient verification of data authenticity
7.5CVSS 3.0 base score, v2 5.0
0.89%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

Description

In Nimbus JOSE+JWT before 4.39, there is no integer-overflow check when converting length values from bytes to bits, which allows attackers to conduct HMAC bypass attacks by shifting Additional Authenticated Data (AAD) and ciphertext so that different plaintext is obtained for the same HMAC.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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/0d2bd649ea386539220d4facfe1f65eb1dadb86c Third Party Advisory
https://bitbucket.org/connect2id/nimbus-jose-jwt/issues/224/byte-to-bit-overflow-in-cbc PatchThird Party Advisory
https://bitbucket.org/connect2id/nimbus-jose-jwt/src/master/CHANGELOG.txt Release NotesThird Party Advisory
https://lists.apache.org/thread.html/9317fd092b257a0815434b116a8af8daea6e920b6673f4fd5583d5fe%40%3Ccommits.druid.apache.
https://bitbucket.org/connect2id/nimbus-jose-jwt/commits/0d2bd649ea386539220d4facfe1f65eb1dadb86c Third Party Advisory
https://bitbucket.org/connect2id/nimbus-jose-jwt/issues/224/byte-to-bit-overflow-in-cbc PatchThird Party Advisory
https://bitbucket.org/connect2id/nimbus-jose-jwt/src/master/CHANGELOG.txt Release NotesThird Party Advisory
https://lists.apache.org/thread.html/9317fd092b257a0815434b116a8af8daea6e920b6673f4fd5583d5fe%40%3Ccommits.druid.apache.

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Related vulnerabilities

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

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Source: NIST National Vulnerability Database (record CVE-2017-12972), CISA KEV, FIRST EPSS (scores of 2026-10-14). This page is refreshed as NVD updates the record.