CVE-2026-29035
CivetWeb WebSocket compressed-frame overflow allows remote memory corruption.
Is CVE-2026-29035 being exploited?
Not confirmed. CVE-2026-29035 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 0.47% probability of exploitation in the next 30 days.
How severe is CVE-2026-29035?
CVE-2026-29035 is rated High with a CVSS score of 8.3. 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-2026-29035?
Not known from our data. No patch reference has been recorded for CVE-2026-29035, 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-2026-29035 affect?
CVE-2026-29035 affects CivetWeb (commit 4a4f0c95), Applications embedding CivetWeb, IoT/embedded devices using CivetWeb, Servers built with USE_ZLIB + MG_EXPERIMENTAL_INTERFACES. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-29035?
Apply vendor patch when available or disable zlib/permessage-deflate; block/inspect untrusted WebSocket traffic.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote unauthenticated memory corruption via crafted permessage-deflate WebSocket frames, enabling DoS or potential remote code execution.
Immediate action required
- affected<= 4a4f0c95
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.