Vulnerability · Published May 1, 2026 · Assigned by mitre
CVE-2026-43507
Medium 5.3
In plain English
A medium-severity resource allocation without limits in Prosody from Prosody. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 29% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.3%top 71.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
An issue was discovered in Prosody before 0.12.6 and 1.0.0 through 13.0.0 before 13.0.5. A Denial of Service can occur via memory exhaustion caused by XML parsing resource amplification from unauthenticated connections.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.21 | prosody | 0.12.6-r0 | ALPINE-CVE-2026-43507 |
| Alpine:v3.22 | prosody | 0.12.6-r0 | ALPINE-CVE-2026-43507 |
| Alpine:v3.23 | prosody | 13.0.5-r0 | ALPINE-CVE-2026-43507 |
| Alpine:v3.24 | prosody | 13.0.5-r0 | ALPINE-CVE-2026-43507 |
| Debian:12 | prosody | 0.12.3-1+deb12u1 | DEBIAN-CVE-2026-43507 |
| Debian:13 | prosody | 13.0.1-1+deb131u | DEBIAN-CVE-2026-43507 |
| Debian:14 | prosody | 13.0.5-1 | DEBIAN-CVE-2026-43507 |
| Ubuntu:22.04:LTS | prosody | no fix listed | UBUNTU-CVE-2026-43507 |
| Ubuntu:24.04:LTS | prosody | no fix listed | UBUNTU-CVE-2026-43507 |
| Ubuntu:25.10 | prosody | no fix listed | UBUNTU-CVE-2026-43507 |
| Ubuntu:26.04:LTS | prosody | no fix listed | UBUNTU-CVE-2026-43507 |
| Ubuntu:26.10 | prosody | no fix listed | UBUNTU-CVE-2026-43507 |
Affected products (as reported)
Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L