How severe is CVE-2026-49847?

CVE-2026-49847 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-49847 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (33rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-49847?

CVE-2026-49847 affects Freeswitch. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-49847?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-49847 have an EU (EUVD) identifier?

Yes. CVE-2026-49847 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-35493.

When was CVE-2026-49847 published?

CVE-2026-49847 was published on 2026-06-09 and last updated on 2026-06-17.

CVE-2026-49847

CVE-2026-49847 is a high-severity vulnerability in Freeswitch with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-674.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (33rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-35493
Weakness: CWE-674
Affected product: Freeswitch
Published: 2026-06-09
Last modified: 2026-06-17

Description

FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to version 1.11.1, a single unauthenticated WebSocket frame containing a deeply nested JSON document crashes the FreeSWITCH process via stack overflow, terminating all calls and sessions on the host. The recursion drives the worker thread's stack pointer into the stack guard page, raising SIGSEGV from the kernel before any usable write primitive develops. This issue has been patched in version 1.11.1.

Frequently asked questions

What is CVE-2026-49847?: FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to version 1.11.1, a single unauthenticated WebSocket frame containing a deeply nested JSON document crashes the FreeSWITCH process via stack overflow, terminating all calls and sessions on the host. The recursion drives the worker thread's stack pointer into the stack guard page, raising SIGSEGV from the kernel before any usable write primitive develops. This issue has been patched in version 1.11.1.
How severe is CVE-2026-49847?: CVE-2026-49847 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-49847 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (33rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-49847?: CVE-2026-49847 affects Freeswitch. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-49847?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-49847 have an EU (EUVD) identifier?: Yes. CVE-2026-49847 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-35493.
When was CVE-2026-49847 published?: CVE-2026-49847 was published on 2026-06-09 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:freeswitch:freeswitch:*:*:*:*:*:*:*:*

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