An issue was discovered in Prosody before 0.12.6 and 1.0.0 through 13.0.0 before 13.0.5.

published 2026-05-01 6 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-26659

cvss: 5.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 20%
public exploits: 0; none known

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 memory leaks from unauthenticated connections.

Patch / fix

fixed in 1 distros 2 links 2

Prosody Prosody 0.12.6, 13.0.5

debian alpine

prosody Debian 12 0.12.3-1+deb12u1
prosody Debian 13 13.0.1-1+deb131u
prosody Debian 14 13.0.5-1

debian advisories DEBIAN-CVE-2026-43506

prosody Alpine 3.22, Alpine 3.21 0.12.6-r0
prosody Alpine 3.24, Alpine 3.23 13.0.5-r0

alpine advisories ALPINE-CVE-2026-43506

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

openwall.com/lists/oss-security/2026/05/01/5 advisory
prosody.im/security/advisory_735dd9d3/ advisory

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-43506 updated 2026-06-28 cvss 7.5

Prosody: Prosody: Denial of Service via memory exhaustion from unauthenticated connections

Red Hat All currently supported Red Hat products
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: partial
Assessed: 6 mo ago (2026-05-01)

Exploit prediction

0.28% chance of exploitation in the next 30 days, higher than 20% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Prosody Prosody

Classification

Weakness

CWE-401 Missing Release of Memory after Effective Lifetime

References

openwall.com /lists/oss-security/2026/05/01/5
mailing-list, patch, third-party-advisory
prosody.im /security/advisory_735dd9d3/
mitigation, patch, vendor-advisory

Sources

CVE List CVE-2026-43506
NVD CVE-2026-43506

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary