cowlib vulnerabilities and fixes

Recent CVEs affecting cowlib, with upgrade or downgrade steps. 3 tracked.

cowlib has 3 tracked vulnerabilities, 0 critical. A fixed release or vendor patch exists for 3. Most recent: 2026-05-11. Highest priority: CVE-2026-7790 (score 41/100).

• CVE-2026-43969 LOW 3.2 UPGRADE Improper Neutralization of CRLF Sequences ('CRLF Injection') vulnerability in ninenines cowlib allows HTTP req
• CVE-2026-7790 HIGH 7.5 UPGRADE Uncontrolled Resource Consumption vulnerability in ninenines cowlib (cow_http_te module) allows Excessive Allo
• CVE-2026-43968 MEDIUM 4.0 UPGRADE Improper Neutralization of CRLF Sequences ('CRLF Injection') vulnerability in ninenines cowlib allows SSE even

FAQ

How do I fix cowlib vulnerabilities?

Open the CVE for your version, check the affected range, then follow the listed action: upgrade to the fixed release, or downgrade or mitigate if no fix exists yet. Commands for each OS are shown on every CVE page.

Is cowlib being exploited right now?

None of the tracked cowlib CVEs are on the CISA Known Exploited Vulnerabilities list at the moment. This is checked every 20 minutes.

Which cowlib CVE should I patch first?

CVE-2026-7790 currently ranks highest (41/100): Uncontrolled Resource Consumption vulnerability in ninenines cowlib (cow_http_te module) allows Excessive Allo.

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