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Advisory record · GHSA-2q89-485c-9j2x

Improper random reading in CIRCL

CVSS 5.3 MediumEPSS 0.0039 · 32nd percentile

Published by the GitHub Advisory Database at 11 May 2023, 20:40 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/cloudflare/circlGo<1.3.31.3.3
Identifiers
GHSA-2q89-485c-9j2x · CVE-2023-1732 · GO-2023-1765
Weakness (CWE)
CWE-20 · CWE-755
Tags
Published
11 May 2023
Updated
10 Sept 2026

Machine-written summary

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

Versions of the Go package github.com/cloudflare/circl before 1.3.3 are affected. The Kyber and FrodoKEM shared-secret code did not check errors from crypto/rand.Read(), so in rare cases where that read fails, the shared secret can be predictable. The tkn20 and blindrsa components also did not check whether enough randomness was returned, which can weaken blinding or the integrity of tkn20 plaintexts. Upgrade to version 1.3.3 or later.

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:L/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:N CNA (cloudflare)
  • CISA KEV Not listed.
  • EPSS 0.0039, the 32nd percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:16 UTC First seen by agentprime
  2. 31 Oct 2026, 14:16 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.