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Not in CISA KEV
HIGH severity

CVE-2026-57554

HIGH

CVE-2026-57554 is a high-severity (CVSS 7.8) Use After Free vulnerability. No vendor fix is recorded yet; mitigation options are listed below.

Memory Corruption when asynchronous threads access shared performance counter data simultaneously during FastRPC invocations.

Published
Updated
Affected
—
Patched
—
Exploits
None indexed
Exploitation data as of Oct 6, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Description

Memory Corruption when asynchronous threads access shared performance counter data simultaneously during FastRPC invocations.

Detection & mitigation playbook

Vulnerability

  1. Detect

    Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).

  2. Remediation status

    No fixed release is recorded for CVE-2026-57554 yet. Track the upstream advisory, and apply the exposure-reduction steps below in the meantime.

  3. Mitigate without a patch

    Constrain what reaches the vulnerable code: limit the size and shape of untrusted input, isolate the affected component in a sandboxed or least-privileged process, and enable the platform's memory-safety mitigations (ASLR, stack protector, hardened allocator) so an out-of-bounds access is more likely to fail closed than to be exploitable.

Frequently Asked Questions

Memory Corruption when asynchronous threads access shared performance counter data simultaneously during FastRPC invocations.
O3 Security · Impact-Aware SCA

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