An issue was discovered in Prosody before 0.12.6 and 1.0.0 through 13.0.0 before 13.0.5. (CVE-2026-43507)
Description
A denial of service vulnerability exists in Prosody versions before 0.12.6 and from 1.0.0 through 13.0.0 before 13.0.5. The issue is caused by memory exhaustion due to XML parsing resource amplification from unauthenticated connections.
CVSS v3.1
Score 7.5high
Affected software
pkg:deb/ubuntu/prosody?arch=source&distro=xenialpkg:deb/ubuntu/prosody?arch=source&distro=esm-apps/bionicpkg:deb/ubuntu/prosody?arch=source&distro=focalpkg:deb/ubuntu/prosody?arch=source&distro=jammypkg:deb/ubuntu/prosody?arch=source&distro=noblepkg:deb/ubuntu/prosody?arch=source&distro=questingpkg:deb/ubuntu/prosody?arch=source&distro=stonkingpkg:deb/ubuntu/prosody?arch=source&distro=resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-43507 describes a denial of service vulnerability in the Prosody XMPP server. The flaw occurs in versions prior to 0.12.6 and from 1.0.0 up to but not including 13.0.5. It allows an unauthenticated attacker to cause memory exhaustion by exploiting resource amplification during XML parsing, leading to a denial of service condition.
Potential Impact
An attacker can cause the Prosody server to exhaust memory resources, resulting in a denial of service. There is no impact on confidentiality or integrity reported. The vulnerability can be triggered remotely without authentication.
Mitigation Recommendations
A fix is available in Prosody version 0.12.6 and in versions 13.0.5 and later. Users should upgrade to these versions to remediate the vulnerability.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-43507
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:25.10","Ubuntu:26.10","Ubuntu:26.04:LTS"]
- Cvss Version
- 3.1
Threat ID: 6ad3f67d2cdf04f65666690f
Added to database: 10/17/2026, 22:28:13 UTC
Last enriched: 10/18/2026, 01:37:35 UTC
Last updated: 10/18/2026, 01:37:35 UTC
Views: 5
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