CVE-2026-55402
MitM-triggered out-of-bounds read causes persistent DoS on Secure Access servers.
Is CVE-2026-55402 being exploited?
Not confirmed. CVE-2026-55402 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 0.29% probability of exploitation in the next 30 days.
How severe is CVE-2026-55402?
CVE-2026-55402 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-2026-55402?
Yes. A fix has been recorded for CVE-2026-55402. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-55402 affect?
CVE-2026-55402 affects Secure Access servers (versions prior to 14.57), Remote access infrastructure using affected Secure Access servers. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-55402?
Upgrade Secure Access servers to version 14.57 immediately
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
An attacker in a man-in-the-middle position can send crafted data causing an out-of-bounds read that results in a persistent denial of service.
Patch when possible
- affected< 14.57
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.