CVE-2026-77354
Unauthenticated DoS via deepObject query index causing multi-GB allocation.
Is CVE-2026-77354 being exploited?
Not confirmed. CVE-2026-77354 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 0.30% probability of exploitation in the next 30 days.
How severe is CVE-2026-77354?
CVE-2026-77354 is rated High with a CVSS score of 8.7. 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-2026-77354?
Yes. A fix has been recorded for CVE-2026-77354. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-77354 affect?
CVE-2026-77354 affects kin-openapi 0.124.0–0.141.0, Go services using openapi3filter/req_resp_decoder.go, APIs accepting deepObject-style query arrays. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-77354?
Upgrade kin-openapi to >=0.142.0; add input validation and enforce rate/size limits.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated attacker can craft deepObject query indexes to force multi-GB heap allocations, causing OOM kills or service restarts (denial of service).
Immediate action required
- affected>= 0.124.0 and < 0.142.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.