UNKNOWNhex →
HTTP Response Splitting via Non-VCHAR Bytes in cow_http_struct_hd:escape_string/2
HTTP Response Splitting via Non-VCHAR Bytes in cow_http_struct_hd:escape_string/2
Affected packages
- cowlib
Exploit signal
- Known exploited (CISA KEV)
- No
- EPSS score
- 0.31%
- EPSS percentile
- 23.7%
EPSS is the probability a CVE is exploited in the wild; percentile is its rank among all CVEs. This advisory is in the top 24%.
Sources
- https://cna.erlef.org/cves/CVE-2026-43966.html
- https://github.com/ninenines/cowboy/commit/f77cb9b5e730e300fffb551db1ba5d1c4ed878ef
- https://github.com/ninenines/gun/commit/4f35609eb37109b106a863fc9ba83d7ee64e3e42
- https://hex.pm/packages/cowlib
Structured record: https://osv.dev/vulnerability/EEF-CVE-2026-43966
Recommended response stack
Snyk — Scan your dependencies in CI and fix this vulnerability.→Socket — Detect malicious and compromised packages before they ship.→
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