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MEDIUM severity

CVE-2021-3680 — showdoc

MEDIUMFix: star7th/showdoc@4b962c1

CVE-2021-3680 is a medium-severity (CVSS 4.9) CWE-325 vulnerability in showdoc/showdoc. 1 public exploit reference exists, so weaponization risk is real. No vendor fix is recorded yet; mitigation options are listed below.

Inadequate Encryption Strength in showdoc

Also known asGHSA-8vh3-29mr-m9xg
Published
Updated
Affected
1 pkg
Patched
See advisory
Exploits
1 known
Exploitation data as of Oct 9, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.5%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs38th percentile — riskier than 38% of all scored CVEsHighest risk
0.00%0.32%0.64%0.96%0.1%0.5%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2021-3680 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,738 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected
🐘showdoc/showdoc

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

showdoc makes use of a hardcoded salt in its user password hash function

Affected Packages

1 total
EcosystemPackageVulnerable rangeFix
🐘Packagistshowdoc/showdocall versionsNo fix

Affected Products

1 product · 1 configurations
Application
showdocshowdoc
≤ 2.9.7
range
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

showdoc is vulnerable to Missing Cryptographic Step

huntr.devNVDAug 2021

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for showdoc/showdoc, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Remediation status

    No patched version of showdoc/showdoc has shipped for CVE-2021-3680 yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.

  3. Mitigate without a patch

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

showdoc makes use of a hardcoded salt in its user password hash function
O3 Security · Impact-Aware SCA

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CVE-2021-3680: showdoc: Inadequate Encryption Strength