CVE-2026-38967
Response header injection in CrowCpp HTTP v1.3.1.
Is CVE-2026-38967 being exploited?
Not confirmed. CVE-2026-38967 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.33% probability of exploitation in the next 30 days.
How severe is CVE-2026-38967?
CVE-2026-38967 is rated Critical with a CVSS score of 9.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-38967?
Not known from our data. No patch reference has been recorded for CVE-2026-38967, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-38967 affect?
CVE-2026-38967 affects CrowCpp Crow HTTP library (≤ v1.3.1). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-38967?
Upgrade to patched version when released
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Allows attacker to inject/modify HTTP response headers (redirects, cookie/header manipulation, cache poisoning).
Patch when possible