CVE-2026-49841

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 68% 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: cna:github_m, epss
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.8Exploit: 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, the mod_verto HTTP request handler allocates a fixed 2 MiB buffer for a POST application/x-www-form-urlencoded body but accepts Content-Length up to just under 10 MiB. The body-read loop is bounded by Content-Length rather than the buffer size, producing an attacker-controlled heap overflow of up to ~8 MiB -- before the HTTP basic-auth check runs. This issue has been patched in version 1.11.1.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
31.6%
KEV
Not listed

Published

June 9, 2026

Last Modified

June 11, 2026

Advisory Details (2)

Auto-updated Jun 20, 2026
Patch available. Sources: github, github_release.
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
github Patch Available

Pre-authentication heap buffer overflow in `mod_verto` HTTP POST body read. · Advisory · signalwire/freeswitch · GitHub

https://github.com/signalwire/freeswitch/security/advisories/GHSA-wfrq-qvg2-f88f

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 26× in last 7d / 174× 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.

Showing the most recent 100 of 191 total refreshes for this CVE.

  1. 2026-07-11 21:57 UTCEG score recompute
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Frequently asked(5)

What is CVE-2026-49841?
CVE-2026-49841 is a critical 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, the mod_verto HTTP request handler allocates a fixed 2 MiB buffer for a POST…
When was CVE-2026-49841 disclosed?
CVE-2026-49841 was first published in the National Vulnerability Database on June 9, 2026, with the most recent update on June 11, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-49841 actively exploited?
CVE-2026-49841 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 31.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-49841?
CVE-2026-49841 has a CVSS v4.0 base score of 9.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-49841?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-49841, 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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