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Vulnerability record · CVE-2020-8929 · published 19 October 2020

CVE-2020-8929: Google tink java vulnerability

Google · Tink Java

A mis-handling of invalid unicode characters in the Java implementation of Tink versions prior to 1.5 allows an attacker to change the ID part of a ciphertext, which result in the creation of a second ciphertext that can decrypt to the same plaintext. This can be a problem with encrypting deterministic AEAD with a single key, and rely on a unique ciphertext-per-plaintext.

5.3 CVSS 3.1 Medium EPSS 0.46% · top 62.4% CWE-176 · CWE-176
5.3CVSS 3.1 base score, v2 5.0
0.46%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

A mis-handling of invalid unicode characters in the Java implementation of Tink versions prior to 1.5 allows an attacker to change the ID part of a ciphertext, which result in the creation of a second ciphertext that can decrypt to the same plaintext. This can be a problem with encrypting deterministic AEAD with a single key, and rely on a unique ciphertext-per-plaintext.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected products

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

References

LinkTags
https://github.com/google/tink/commit/93d839a5865b9d950dffdc9d0bc99b71280a8899 PatchThird Party Advisory
https://github.com/google/tink/security/advisories/GHSA-g5vf-v6wf-7w2r PatchThird Party Advisory
https://github.com/google/tink/commit/93d839a5865b9d950dffdc9d0bc99b71280a8899 PatchThird Party Advisory
https://github.com/google/tink/security/advisories/GHSA-g5vf-v6wf-7w2r PatchThird Party Advisory

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Related vulnerabilities

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

8.2CVE-2026-15432Google tink java vulnerabilityWhen verifying a mac with a ChunkedMacVerification object, Tink compares the resulting tag with non constant time comparison. This potentially allows…EPSS 0.16%7.3CVE-2024-43093Android ExternalStorageProvider path filter bypass via unicode normalizationExternalStorageProvider.java's shouldHideDocument function fails to correctly normalize unicode, allowing a crafted file path to bypass the filter th…KEVEPSS 0.72%analysed

Source: NIST National Vulnerability Database (record CVE-2020-8929), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.