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CVE-2026-49840

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, esl_recv_event() parses Content-Length with atol() and passes the result straight to malloc(len + 1) with no sign or magnitude check. A malicious or man-in-the-middle ESL peer can send a frame with a negative Content-Length to corrupt the heap of, or crash, any process linked against libesl,
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:19a810e86253f4654dd9024ebfd01312a9d450ff2fffe46daa9b9a2d58db9748
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 4 assertions

{"cweId":"CWE-20","description":"CWE-20: Improper Input Validation","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c0cf1763b76a699719e0779044072e22e74d8777a8a9042f3f22dd3a66f55764 · sha256:ba781ea8d8c1dcac… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-195","description":"CWE-195: Signed to Unsigned Conversion Error","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c0cf1763b76a699719e0779044072e22e74d8777a8a9042f3f22dd3a66f55764 · sha256:ba781ea8d8c1dcac… · /containers/cna/problemTypes/2/descriptions/0

{"cweId":"CWE-787","description":"CWE-787: Out-of-bounds Write","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c0cf1763b76a699719e0779044072e22e74d8777a8a9042f3f22dd3a66f55764 · sha256:ba781ea8d8c1dcac… · /containers/cna/problemTypes/3/descriptions/0

{"cweId":"CWE-122","description":"CWE-122: Heap-based Buffer Overflow","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c0cf1763b76a699719e0779044072e22e74d8777a8a9042f3f22dd3a66f55764 · sha256:ba781ea8d8c1dcac… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"product":"freeswitch","vendor":"signalwire","versions":[{"status":"affected","version":"< 1.11.1"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:c0cf1763b76a699719e0779044072e22e74d8777a8a9042f3f22dd3a66f55764 · sha256:ba781ea8d8c1dcac… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.1,"baseSeverity":"CRITICAL","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:c0cf1763b76a699719e0779044072e22e74d8777a8a9042f3f22dd3a66f55764 · sha256:ba781ea8d8c1dcac… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

4 source assertions
{"cweId":"CWE-20","description":"CWE-20: Improper Input Validation","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c0cf1763b76a699719e0779044072e22e74d8777a8a9042f3f22dd3a66f55764 · sha256:ba781ea8d8c1dcac… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-195","description":"CWE-195: Signed to Unsigned Conversion Error","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c0cf1763b76a699719e0779044072e22e74d8777a8a9042f3f22dd3a66f55764 · sha256:ba781ea8d8c1dcac… · /containers/cna/problemTypes/2/descriptions/0
{"cweId":"CWE-787","description":"CWE-787: Out-of-bounds Write","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c0cf1763b76a699719e0779044072e22e74d8777a8a9042f3f22dd3a66f55764 · sha256:ba781ea8d8c1dcac… · /containers/cna/problemTypes/3/descriptions/0
{"cweId":"CWE-122","description":"CWE-122: Heap-based Buffer Overflow","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c0cf1763b76a699719e0779044072e22e74d8777a8a9042f3f22dd3a66f55764 · sha256:ba781ea8d8c1dcac… · /containers/cna/problemTypes/1/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/signalwire/freeswitch/releases/tag/v1.11.1","tags":["x_refsource_MISC"],"url":"https://github.com/signalwire/freeswitch/releases/tag/v1.11.1"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c0cf1763b76a699719e0779044072e22e74d8777a8a9042f3f22dd3a66f55764 · sha256:ba781ea8d8c1dcac… · /containers/cna/references/1
{"name":"https://github.com/signalwire/freeswitch/security/advisories/GHSA-g597-9fgg-ghg9","tags":["x_refsource_CONFIRM"],"url":"https://github.com/signalwire/freeswitch/security/advisories/GHSA-g597-9fgg-ghg9"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c0cf1763b76a699719e0779044072e22e74d8777a8a9042f3f22dd3a66f55764 · sha256:ba781ea8d8c1dcac… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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