CVE-2020-8929

Ciphertext integrity weakness in Tink

Published Oct 19, 2020 CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2020-0220 Ciphertext Malleability Issue in Tink Java
Github GHSA Github GHSA GHSA-g5vf-v6wf-7w2r Ciphertext Malleability Issue in Tink Java
History
Type Values Removed Values Added
First Time appeared Google tink Java
CPEs cpe:2.3:a:google:tink:*:*:*:*:*:*:*:* cpe:2.3:a:google:tink_java:*:*:*:*:*:*:*:*
Vendors & Products Google tink
Google tink Java
Weaknesses

Sources

Status
PUBLISHED
Assigner
Google
Published
Updated
Aug 4, 2024, 10:12 AM
Reserved
Feb 12, 2020, 12:00 AM
Status
Analyzed
Published
Oct 19, 2020, 1:15 PM
Modified
Jun 17, 2026, 3:27 AM