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MEDIUM severity

http before 0.13.3 vulnerable to header injectionGHSA-4rgh-jx4f-qfcq

MEDIUMFix: dart-lang/http#512

GHSA-4rgh-jx4f-qfcq is a medium-severity (CVSS 6.1) CWE-74 vulnerability in http. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for http — see the affected versions and patch details below.

Also known asCVE-2020-35669
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Nov 11, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
2.2%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs82th percentile — riskier than 82% of all scored CVEsHighest risk
0.00%10.8%21.6%32.3%25.4%2.2%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
🎯http

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

An issue was discovered in the http package before 0.13.3 for Dart. If the attacker controls the HTTP method and the app is using Request directly, it's possible to achieve CRLF injection in an HTTP request via HTTP header injection. This issue has been addressed in commit abb2bb182 by validating request methods.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🎯Pubhttpall versions0.13.3dart pub upgrade http

Affected Products

1 product · 1 configurations
Application
httpdart
≤ 0.12.2
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.

An issue was discovered in the http package through 0.12.2 for Dart. If …

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

  2. Fix

    Update http to 0.13.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-4rgh-jx4f-qfcq 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

An issue was discovered in the http package before 0.13.3 for Dart. If the attacker controls the HTTP method and the app is using Request directly, it's possible to achieve CRLF injection in an HTTP request via HTTP header injection. This issue has been addressed in commit abb2bb182 by validating request methods.
O3 Security · Impact-Aware SCA

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GHSA-4rgh-jx4f-qfcq: http — Fixed in 0.13.3