Nimbus JOSE+JWT missing overflow check

Also known as GHSA-2qp9-wg27-9pcv

Published 9 y ago 2017-08-20 · modified 4 mo ago 2026-06-17 · JSON

CVSS

7.5

v3.0 · NVD

CISA KEV

not known exploited

EPSS

0.9%

percentile 59%

Public exploits

none known

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.

Exploit prediction (EPSS)

0.89% probability of exploitation in the next 30 days, higher than 59% of all scored CVEs.

CVSS scores

Assigned by	Version	Score	Vector
NVD	3.0	7.5	`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N`
NVD	2.0	5.0	`AV:N/AC:L/Au:N/C:N/I:P/A:N`
GitHub	3.0	7.5	`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N`

Affected packages

Ecosystem	Package	Affected	Fixed in
maven	`com.nimbusds:nimbus-jose-jwt`	<4.39	4.39

Classification

Weakness

CWE-345 Insufficient Verification of Data Authenticity

References

bitbucket.org /connect2id/nimbus-jose-jwt/issues/224/byte-to-bit-overflow-in-cbc · x_refsource_CONFIRM, x_transferred
bitbucket.org /connect2id/nimbus-jose-jwt/commits/0d2bd649ea386539220d4facfe1f65eb1dadb86c · x_refsource_CONFIRM, x_transferred
bitbucket.org /connect2id/nimbus-jose-jwt/src/master/CHANGELOG.txt · x_refsource_CONFIRM, x_transferred
lists.apache.org /thread.html/9317fd092b257a0815434b116a8af8daea6e920b6673f4fd5583d5fe%40%3Ccommits.druid.a · mailing-list, x_refsource_MLIST, x_transferred
nvd.nist.gov /vuln/detail/CVE-2017-12972 · advisory
lists.apache.org /thread.html/9317fd092b257a0815434b116a8af8daea6e920b6673f4fd5583d5fe@%3Ccommits.druid.apa · web

Sources

CVE List: CVE-2017-12972
GitHub Advisory: GHSA-2qp9-wg27-9pcv
NVD: CVE-2017-12972

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