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🎯 Pub
Not in CISA KEV
HIGH severity

dio vulnerable to CRLF injection with HTTP method stringGHSA-9324-jv53-9cc8

HIGHFix: cfug/dio@927f79e

GHSA-9324-jv53-9cc8 is a high-severity (CVSS 7.5) CWE-74 vulnerability in dio. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for dio — see the affected versions and patch details below.

Also known asCVE-2021-31402
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Nov 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.2%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs68th percentile — riskier than 68% of all scored CVEsHighest risk
0.00%0.56%1.11%1.67%0.3%1.2%May 26Sep 26Nov 26

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

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🎯dio

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

Description

Impact

The dio package 4.0.0 for Dart allows CRLF injection if the attacker controls the HTTP method string, a different vulnerability than CVE-2020-35669.

Patches

The vulnerability has been resolved by https://github.com/cfug/dio/commit/927f79e93ba39f3c3a12c190624a55653d577984, and included since v5.0.0.

Workarounds

Cherry-pick the commit to your own fork can resolves the vulberability too.

References

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🎯Pubdioall versions5.0.0dart pub upgrade dio

Affected Products

1 product · 1 configurations
Application
dioflutterchina
≥ 4.0.0 && < 5.0.0
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.

The dio package 4.0.0 for Dart allows CRLF injection if the attacker con…

github.comNVDApr 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 dio, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update dio to 5.0.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-9324-jv53-9cc8 is resolved across your whole dependency graph.

  3. Workarounds

    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

### Impact The dio package 4.0.0 for Dart allows CRLF injection if the attacker controls the HTTP method string, a different vulnerability than CVE-2020-35669. ### Patches The vulnerability has been resolved by https://github.com/cfug/dio/commit/927f79e93ba39f3c3a12c190624a55653d577984, and included since v5.0.0. ### Workarounds Cherry-pick the commit to your own fork can resolves the vulberability too. ### References - https://nvd.nist.gov/vuln/detail/CVE-2021-31402 - https://osv.dev/GHSA-jwpw-q68h-r678 - https://github.com/cfug/dio/issues/1130 - https://github.com/cfug/dio/issues/1752
O3 Security · Impact-Aware SCA

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dio vulnerable to CRLF injection with HTTP method string