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Vulnerability Database · Go · Package report

github.com/cloudflare/circl: vulnerability history, versions and safety

github.com/cloudflare/circl is a package in the Go ecosystem. Vulert records 11 vulnerabilities for it across 120 releases, from May 2023 to Feb 2026. Each vulnerability names the versions it affects, the fixed version to move to, and a workaround where no fix has been published.

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11 vulnerabilities recorded H1 M1 L4 U5
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0 with no fix published

Every vulnerability has a patched version to move to.

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2 in the last 12 months

Most recent disclosure 27 Feb 2026.

See the disclosure history →
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0 malicious-package vulnerabilities

No published version shipped hostile code.

See all github.com/cloudflare/circl vulnerabilities

Vulert verdict on github.com/cloudflare/circl v1.6.5 i

Updated on 23 Oct 2026

Action needed: v1.6.5 has 11 known vulnerabilities, but every one of them has a fix. Upgrade to the version listed below and you are clear.

Package health score 80/100
  • Security Minor issues
  • Maintenance Sustainable
  • Popularity Widely used
  • Community Moderate

What to do: Upgrade to the version that resolves each vulnerability below. Fix it, then keep watch: this version is affected today, and the next one may be too — Vulert alerts you when a new vulnerability lands. Monitor it with Vulert →

  • Current release v1.6.5 — affected i
  • Vulnerabilities on record 11 over 2 years · 2 in the last year i
  • Latest disclosure 27 Feb 2026 i
  • Highest CVSS 5.3 i
  • With no published fix 0 i
  • Stars 1,729 i
  • OpenSSF scorecard 6/10 i
  • Last release 2 months ago i
  • Licence BSD-3-Clause i

Version list, release dates, licence and dependants published by the Go module proxy, refreshed 23 Oct 2026. Licence information is not legal advice.

Concerned about your application's security?

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01 Versions

Which versions are affected

Every version Vulert tracks for github.com/cloudflare/circl, newest first, with the vulnerabilities recorded against each one. A version showing none has no vulnerability in the Vulert database — open it for the full picture on that release.

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Version Released Vulert vulnerabilities Licence Fix published Details
v0.0.0-20260928165137-91db3e785ba2 28 Sep 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.6-0.20260928165137-91db3e785ba2 28 Sep 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v0.0.0-20260923145125-ec8b4f2f7305 23 Sep 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.6-0.20260923145125-ec8b4f2f7305 23 Sep 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v0.0.0-20260909114340-2ef8bf457d28 09 Sep 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.6-0.20260909114340-2ef8bf457d28 09 Sep 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v0.0.0-20260907153824-388f7d56e5a3 07 Sep 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.6-0.20260907153824-388f7d56e5a3 07 Sep 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.6-0.20260907123956-9ca6fed4e669 07 Sep 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v0.0.0-20260824140020-352600b0a4b2 24 Aug 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.6-0.20260824140020-352600b0a4b2 24 Aug 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v0.0.0-20260806151822-33d33c75d9a0 06 Aug 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.6-0.20260806151822-33d33c75d9a0 06 Aug 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v0.0.0-20260805163219-cfa7c70defd8 05 Aug 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.5 05 Aug 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v0.0.0-20260803222022-e850bcdcbb14 03 Aug 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.5-0.20260803222022-e850bcdcbb14 03 Aug 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.5-0.20260803220503-2ce0fd7c4c7a 03 Aug 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v0.0.0-20260731205605-df9fbeabf921 31 Jul 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.5-0.20260731205605-df9fbeabf921 31 Jul 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.4-0.20260731153920-25cb86a30ad5 31 Jul 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.5-0.20260731153920-25cb86a30ad5 31 Jul 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v0.0.0-20260725174654-c55f49e67f75 25 Jul 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.5-0.20260725174654-c55f49e67f75 25 Jul 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v0.0.0-20260722160430-1554bbf1fdba 22 Jul 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.5-0.20260722160430-1554bbf1fdba 22 Jul 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v0.0.0-20260718163227-07dbe16881b2 18 Jul 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.5-0.20260718163227-07dbe16881b2 18 Jul 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.5-0.20260718162640-468a1ce81c48 18 Jul 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.5-0.20260718162526-f41ca19867da 18 Jul 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v0.0.0-20260717194027-4ee951981b5f 17 Jul 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.5-0.20260717194027-4ee951981b5f 17 Jul 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v0.0.0-20260715161633-6302ca89789d 15 Jul 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.5-0.20260715161633-6302ca89789d 15 Jul 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.5-0.20260715144908-0c7e54b635a9 15 Jul 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.5-0.20260715143955-cc67cd18cc31 15 Jul 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v0.0.0-20260714202400-0c3c386bef65 14 Jul 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.5-0.20260714202400-0c3c386bef65 14 Jul 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.5-0.20260714172450-b3dfa30183ff 14 Jul 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v0.0.0-20260619130030-901199c7d4fc 19 Jun 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.4 19 Jun 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.4-0.20260619130030-901199c7d4fc 19 Jun 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v0.0.0-20260618223324-4ea7e9018e28 18 Jun 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.4-0.20260618223324-4ea7e9018e28 18 Jun 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v0.0.0-20260611142153-9547f48f8774 11 Jun 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.4-0.20260611142153-9547f48f8774 11 Jun 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v0.0.0-20260605061943-03204f338553 05 Jun 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.4-0.20260605061943-03204f338553 05 Jun 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v0.0.0-20260604151615-e9bd81b649bc 04 Jun 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.4-0.20260604151615-e9bd81b649bc 04 Jun 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.4-0.20260604151025-fad76c387199 04 Jun 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.4-0.20260603144833-7da621682dc5 03 Jun 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.4-0.20260601144827-91088f23dfab 01 Jun 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v0.0.0-20260507191035-becaf2f2a86f 07 May 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.4-0.20260507191035-becaf2f2a86f 07 May 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v0.0.0-20260506173105-6083cb0c6638 06 May 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.4-0.20260506173105-6083cb0c6638 06 May 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v0.0.0-20260504145946-f0c0fe353bd1 04 May 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.4-0.20260504145946-f0c0fe353bd1 04 May 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v0.0.0-20260424232256-e0e86b598610 24 Apr 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.4-0.20260424232256-e0e86b598610 24 Apr 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v0.0.0-20260421160801-d5c865fa2236 21 Apr 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.4-0.20260421160801-d5c865fa2236 21 Apr 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v0.0.0-20260418014141-a35aac34a64c 18 Apr 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.4-0.20260418014141-a35aac34a64c 18 Apr 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v0.0.0-20260402153207-9798df7b83ca 02 Apr 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.4-0.20260402153207-9798df7b83ca 02 Apr 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v0.0.0-20260325200414-757dde480dd0 25 Mar 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.4-0.20260325200414-757dde480dd0 25 Mar 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v0.0.0-20260323192829-f7d2180d6a77 23 Mar 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.4-0.20260323192829-f7d2180d6a77 23 Mar 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v0.0.0-20260301184331-4296cdee2f36 01 Mar 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.4-0.20260301184331-4296cdee2f36 01 Mar 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v0.0.0-20260122201237-24ae53c5d6f7 22 Jan 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.2-0.20260122201237-24ae53c5d6f7 22 Jan 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.3 22 Jan 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.3-0.20260122110810-581020bd4a83 22 Jan 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.3-0.20260122110810-fcba359f4178 22 Jan 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v0.0.0-20260108185430-341604685ff9 08 Jan 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.3-0.20260108185430-341604685ff9 08 Jan 2026 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v0.0.0-20251222212653-a763d47a6dce 22 Dec 2025 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.2 22 Dec 2025 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v0.0.0-20251219182412-3f0f15b2bfe6 19 Dec 2025 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.2-0.20251219182412-3f0f15b2bfe6 19 Dec 2025 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v0.0.0-20251204010831-23491bd573cf 04 Dec 2025 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.2-0.20251204010831-23491bd573cf 04 Dec 2025 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v0.0.0-20251027185721-da1faa40b98c 27 Oct 2025 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.2-0.20251027185721-da1faa40b98c 27 Oct 2025 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v0.0.0-20250918221321-8859101440c0 18 Sep 2025 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.2-0.20250918221321-8859101440c0 18 Sep 2025 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.2-0.20250915112004-ab0cc2de2c06 15 Sep 2025 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v0.0.0-20250822154823-7eb9f00c5e9d 22 Aug 2025 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.2-0.20250822154823-7eb9f00c5e9d 22 Aug 2025 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v0.0.0-20250817130609-733f2b44e529 17 Aug 2025 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.2-0.20250817130609-733f2b44e529 17 Aug 2025 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v0.0.0-20250817095753-4693da1003d9 17 Aug 2025 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.2-0.20250817095753-4693da1003d9 17 Aug 2025 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v0.0.0-20250815201451-12bafce4833f 15 Aug 2025 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.2-0.20250815201451-12bafce4833f 15 Aug 2025 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v0.0.0-20250815150314-60784de7a3f3 15 Aug 2025 H1 M1 L4 U5 BSD-3-Clause Yes Details →
v1.6.2-0.20250815150314-60784de7a3f3 15 Aug 2025 H1 M1 L4 U5 — Yes Details →
v0.0.0-20250814220148-e5f55290589a 14 Aug 2025 H1 M1 L4 U5 — Yes Details →
v1.6.2-0.20250814220148-e5f55290589a 14 Aug 2025 H1 M1 L4 U5 — Yes Details →
v0.0.0-20250812071322-8bb97daafea7 12 Aug 2025 H1 M1 L4 U5 — Yes Details →
v1.6.2-0.20250812071322-8bb97daafea7 12 Aug 2025 H1 M1 L4 U5 — Yes Details →
v0.0.0-20250811102158-411fdcf8b2b9 11 Aug 2025 H1 M1 L4 U5 — Yes Details →
v1.6.2-0.20250811102158-411fdcf8b2b9 11 Aug 2025 H1 M1 L4 U5 — Yes Details →
v0.0.0-20250721151618-efd1dce03761 21 Jul 2025 H1 M1 L4 U5 — Yes Details →
v1.6.2-0.20250721151618-efd1dce03761 21 Jul 2025 H1 M1 L4 U5 — Yes Details →
v0.0.0-20250715183420-1987ada6ebbc 15 Jul 2025 H1 M1 L4 U5 — Yes Details →
v1.6.2-0.20250715183420-1987ada6ebbc 15 Jul 2025 H1 M1 L4 U5 — Yes Details →
v1.6.2-0.20250714203503-c6b0ff3a366b 14 Jul 2025 H1 M1 L4 U5 — Yes Details →
v0.0.0-20250618153321-aa837fd1539d 18 Jun 2025 H1 M1 L4 U5 — Yes Details →
v1.6.2-0.20250618153321-aa837fd1539d 18 Jun 2025 H1 M1 L4 U5 — Yes Details →
v1.6.2-0.20250606162742-3abc568f8dd8 06 Jun 2025 H1 M1 L4 U5 — Yes Details →
v1.6.2-0.20250606162742-3fcf21b742db 06 Jun 2025 H1 M1 L4 U5 — Yes Details →
v1.6.2-0.20250604230827-acaa79c563ce 04 Jun 2025 H1 M1 L4 U5 — Yes Details →
v1.6.1 09 Apr 2025 H1 M1 L4 U5 — Yes Details →
v1.6.1-0.20250404010453-f97a8962b250 04 Apr 2025 H1 M1 L4 U5 — Yes Details →
v1.6.1-0.20250321152148-5f64bbdb1d1d 21 Mar 2025 H1 M1 L4 U5 — Yes Details →

The newest 120 of 488 versions Vulert tracks. Severity counts are the vulnerabilities recorded against that exact release.

02 Disclosure history

How often vulnerabilities are recorded

  • 2023 3
  • 2024 2
  • 2025 4
  • 2026 2

Counted by the year Vulert recorded each vulnerability — the same date the table below shows as disclosed. 2 of the 11 were recorded in the last 12 months.

03 Vulnerabilities

Recorded vulnerabilities for github.com/cloudflare/circl

The 5 most severe of 11 vulnerabilities recorded for this package

Search all 11 in the database →
Vulnerability Severity Fixed version ↓ Disclosed ↓
CVE-2023-1732: Improper random reading in CIRCL 5.3 medium 1.3.3 11 May 2023
CIRCL-Fourq Vulnerability: Inadequate Validation Leading to Security Risks 3.7 low 1.6.1 10 Jun 2025
CIRCL-FourQ Vulnerability: Low-Order Point Injection Risk in Cloudflare's CIRCL Package 3.7 low 1.6.1 06 Aug 2025
CVE-2026-1229: CIRCL secp384r1 CombinedMult Function Incorrect Calculation Vulnerability 2.9 low 1.6.3 25 Feb 2026
CVE-2023-1732: Improper random reading in CIRCL N/A unrated 1.3.3 24 May 2023

Vulnerability wrong, a fix missing, or a package we should cover? Report it and we will fix the record. Report Vulnerability Provide Feedback

Updated: 23/Oct/2026 · Vulnerabilities in our DB: 524315

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Questions

About github.com/cloudflare/circl

Is github.com/cloudflare/circl safe to use?

Vulert records 11 vulnerabilities for github.com/cloudflare/circl in Go: 0 critical, 1 high, 1 medium and 4 low, plus 5 not yet rated. Every one of them has a published fix, so the practical answer is to run a supported release and keep it patched.

What is github.com/cloudflare/circl's Vulert package health score?

Vulert scores github.com/cloudflare/circl 80/100, which reads as in good shape. The score weighs the vulnerability record (40), maintenance and release cadence (25), adoption from dependents and stars (20) and community signals such as the OpenSSF scorecard and forks (15).

Is the latest version of github.com/cloudflare/circl affected?

Yes. v1.6.5, the version you would install today, has 11 known vulnerabilities, and every one of them has a published fix. Upgrade to the version listed for each.

Which version of github.com/cloudflare/circl should I use?

v1.6.5 is the version Vulert recommends for the affected releases. The version table above lists every release with the vulnerabilities recorded against it, so you can confirm the range you actually run.

How many vulnerabilities does github.com/cloudflare/circl have?

11 vulnerabilities are recorded for github.com/cloudflare/circl in the Go ecosystem: 0 critical, 1 high, 1 medium and 4 low, plus 5 not yet rated. The ledger on this page lists the same counts next to the date of the most recent disclosure.

How often are new github.com/cloudflare/circl vulnerabilities disclosed?

2 vulnerabilities were recorded for github.com/cloudflare/circl in the last 12 months, and the oldest entry in this database dates to 11 May 2023. Recency matters more than a lifetime total: it shows how actively new issues are being disclosed for the package you are considering.

Which versions of github.com/cloudflare/circl are affected?

Each vulnerability on this page lists the affected version range and the fixed version to move to. Open the vulnerability for the version you actually run — fixes are specific to a release line, not to the package as a whole.

How do I monitor github.com/cloudflare/circl for upcoming vulnerabilities?

Upload the manifest or SBOM for your application at vulert.com/scanner and Vulert keeps checking the github.com/cloudflare/circl version you actually run against new disclosures, then alerts you when one affects it. There is no installation and no source-code access required.