CVE-2026-49843

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 80% 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
5.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.3Exploit: 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, mod_verto's JSON-RPC handler bound the connection to the client-supplied sessid on the first frame, before the authentication gate. Binding inserts the connection into the global session hash and, on a key collision, drops the prior occupant of that slot — sending it a verto.punt, detaching its calls, and closing its socket. An unauthenticated network attacker who knows a target session UUID could therefore evict the legitimate client. This issue has been patched in version 1.11.1.

CVSS v3
5.3
EG Score
5.3(medium)
EPSS
20.4%
KEV
Not listed

Published

June 9, 2026

Last Modified

June 10, 2026

Advisory Details (2)

Auto-updated Jun 14, 2026
Patch available. Sources: github_release, github.
github Patch Available

Pre-authentication session eviction via attacker-chosen `sessid` in `mod_verto`. · Advisory · signalwire/freeswitch · GitHub

https://github.com/signalwire/freeswitch/security/advisories/GHSA-9457-fxr9-x78m
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 / 66× 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. 2026-07-15 16:57 UTCEPSS rescore
  2. 2026-07-15 16:57 UTCEPSS rescore
  3. 2026-07-15 10:07 UTCEG score recompute
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  16. 2026-07-07 13:46 UTCEPSS rescore
  17. 2026-07-06 16:27 UTCEPSS rescore
  18. 2026-07-06 02:23 UTCEPSS rescore
  19. 2026-07-05 20:41 UTCEG score recompute
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  1. 2026-07-01 15:07 UTCEPSS rescore
  2. 2026-06-30 23:22 UTCEPSS rescore
  3. 2026-06-30 21:38 UTCEG score recompute
  4. 2026-06-29 21:51 UTCEG score recompute
  5. 2026-06-29 14:06 UTCEPSS rescore
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  7. 2026-06-28 22:04 UTCEG score recompute
  8. 2026-06-28 14:07 UTCEPSS rescore
  9. 2026-06-28 04:56 UTCEPSS rescore
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  11. 2026-06-27 22:15 UTCEG score recompute
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  13. 2026-06-26 22:22 UTCEG score recompute
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  15. 2026-06-25 13:49 UTCEPSS rescore
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  17. 2026-06-24 14:05 UTCEPSS rescore
  18. 2026-06-23 22:51 UTCEG score recompute
  19. 2026-06-23 21:33 UTCEPSS rescore
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  21. 2026-06-22 22:23 UTCEG score recompute
  22. 2026-06-22 14:25 UTCEPSS rescore
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  24. 2026-06-21 19:28 UTCEG score recompute
  25. 2026-06-21 14:56 UTCEPSS rescore
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  27. 2026-06-21 01:59 UTCEPSS rescore
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  29. 2026-06-20 14:48 UTCEG score recompute
  30. 2026-06-19 19:26 UTCEPSS rescore
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  32. 2026-06-19 14:46 UTCEG score recompute
  33. 2026-06-18 17:52 UTCEPSS rescore
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  35. 2026-06-18 14:49 UTCEG score recompute
  36. 2026-06-17 17:53 UTCEPSS rescore
  37. 2026-06-17 14:50 UTCEG score recompute
  38. 2026-06-16 17:53 UTCEPSS rescore
  39. 2026-06-16 15:03 UTCEG score recompute
  40. 2026-06-15 17:49 UTCEPSS rescore
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  42. 2026-06-15 15:16 UTCEG score recompute
  43. 2026-06-14 23:18 UTCEPSS rescore
  44. 2026-06-14 15:25 UTCEG score recompute
  45. 2026-06-13 23:00 UTCEPSS rescore
  46. 2026-06-13 15:39 UTCEG score recompute
  47. 2026-06-12 23:12 UTCEPSS rescore
  48. 2026-06-12 23:12 UTCEPSS rescore
  49. 2026-06-12 15:47 UTCEG score recompute
  50. 2026-06-11 15:59 UTCEG score recompute
  51. 2026-06-11 14:00 UTCEPSS rescore
  52. 2026-06-10 22:19 UTCEPSS rescore
  53. 2026-06-10 16:10 UTCEG score recompute
  54. 2026-06-09 16:23 UTCEG score recompute
  55. 2026-06-09 16:22 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-49843?
CVE-2026-49843 is a medium 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, mod_verto's JSON-RPC handler bound the connection to the client-supplied sessid on the…
When was CVE-2026-49843 disclosed?
CVE-2026-49843 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-2026-49843 actively exploited?
CVE-2026-49843 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 20.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-49843?
CVE-2026-49843 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-49843?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-49843, 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.

Dependency Blast Radius

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