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Advisory record · GHSA-g5vf-v6wf-7w2r

Ciphertext Malleability Issue in Tink Java

CVSS 5.3 MediumEPSS 0.0046 · 40th percentile

Published by the GitHub Advisory Database at 16 Oct 2020, 00:51 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
com.google.crypto.tink:tinkMaven<1.5.01.5.0
Identifiers
GHSA-g5vf-v6wf-7w2r · CVE-2020-8929 · PYSEC-2020-142
Weakness (CWE)
CWE-176 · CWE-327
Tags
Published
16 Oct 2020
Updated
8 Jul 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Tink's Java package com.google.crypto.tink:tink before 1.5.0 let an attacker alter the key ID bytes of a ciphertext so that a second, different ciphertext decrypts to the same plaintext. The advisory says this matters mainly for deterministic AEAD used with a single key, and that confidentiality and plaintext integrity are not affected. Upgrade to version 1.5.0 or later; the advisory lists no workaround other than applying the fix.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
5.3 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N CNA (Google)
  • CISA KEV Not listed.
  • EPSS 0.0046, the 40th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:20 UTC First seen by agentprime
  2. 31 Oct 2026, 14:20 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.