CVE-2026-49847

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 67% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
33.4%
KEV
Not listed

Published

June 9, 2026

Last Modified

June 10, 2026

Advisory Details (2)

Auto-updated Jun 10, 2026
Patch available. Sources: github_release, github.
github Patch Available

Stack overflow in bundled cJSON parser via deeply nested JSON. · Advisory · signalwire/freeswitch · GitHub

https://github.com/signalwire/freeswitch/security/advisories/GHSA-2v74-pcgh-75wg
github_release Patch Available

FreeSWITCH v1.11.1 Release

Patch available: signalwire/freeswitch v1.11.1

https://github.com/signalwire/freeswitch/releases/tag/v1.11.1

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 13× in last 7d / 85× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-12 05:46 UTCEPSS rescore
  2. 2026-07-11 22:15 UTCEG score recompute
  3. 2026-07-11 09:34 UTCEG score recompute
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  6. 2026-07-09 19:10 UTCEPSS rescore
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  10. 2026-07-07 13:46 UTCEPSS rescore
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  13. 2026-07-05 15:41 UTCEG score recompute
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  22. 2026-07-01 15:07 UTCEPSS rescore
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  24. 2026-06-30 23:22 UTCEPSS rescore
  25. 2026-06-30 22:17 UTCEG score recompute
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  1. 2026-06-30 09:37 UTCEG score recompute
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  5. 2026-06-28 14:07 UTCEPSS rescore
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  9. 2026-06-27 18:02 UTCEG score recompute
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  12. 2026-06-26 16:40 UTCEG score recompute
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  20. 2026-06-23 21:33 UTCEPSS rescore
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  22. 2026-06-23 11:35 UTCEG score recompute
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  24. 2026-06-22 14:25 UTCEPSS rescore
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  26. 2026-06-22 05:14 UTCEG score recompute
  27. 2026-06-21 14:56 UTCEPSS rescore
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  30. 2026-06-21 01:59 UTCEPSS rescore
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  33. 2026-06-20 07:44 UTCEG score recompute
  34. 2026-06-19 19:26 UTCEPSS rescore
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  36. 2026-06-19 18:21 UTCEG score recompute
  37. 2026-06-19 05:05 UTCEG score recompute
  38. 2026-06-18 17:52 UTCEPSS rescore
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  40. 2026-06-18 16:11 UTCEG score recompute
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  42. 2026-06-17 17:53 UTCEPSS rescore
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  44. 2026-06-17 02:04 UTCEG score recompute
  45. 2026-06-16 17:53 UTCEPSS rescore
  46. 2026-06-16 13:23 UTCEG score recompute
  47. 2026-06-16 00:38 UTCEG score recompute
  48. 2026-06-15 17:49 UTCEPSS rescore
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  50. 2026-06-15 11:57 UTCEG score recompute
  51. 2026-06-14 23:18 UTCEPSS rescore
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  54. 2026-06-13 23:00 UTCEPSS rescore
  55. 2026-06-13 21:49 UTCEG score recompute
  56. 2026-06-13 09:08 UTCEG score recompute
  57. 2026-06-12 23:12 UTCEPSS rescore
  58. 2026-06-12 23:12 UTCEPSS rescore
  59. 2026-06-12 20:27 UTCEG score recompute
  60. 2026-06-12 07:46 UTCEG score recompute
  61. 2026-06-11 19:06 UTCEG score recompute
  62. 2026-06-11 14:00 UTCEPSS rescore
  63. 2026-06-11 06:25 UTCEG score recompute
  64. 2026-06-10 22:19 UTCEPSS rescore
  65. 2026-06-10 17:44 UTCEG score recompute
  66. 2026-06-10 05:04 UTCEG score recompute
  67. 2026-06-09 16:23 UTCEG score recompute
  68. 2026-06-09 16:22 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-49847?
CVE-2026-49847 is a high vulnerability published on June 9, 2026. 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…
When was CVE-2026-49847 disclosed?
CVE-2026-49847 was first published in the National Vulnerability Database on June 9, 2026, with the most recent update on June 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-49847 actively exploited?
CVE-2026-49847 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 33.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-49847?
CVE-2026-49847 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-49847?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-49847, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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