An issue was discovered in Prosody before 0.12.6 and 1.0.0 through 13.0.0 before 13.0.5, when mod_proxy65 is enabled.

published 2026-05-01 6 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-26658

cvss: 6.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 10%
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, when mod_proxy65 is enabled. Because mod_proxy65 mishandles access control in the activation scenario, relaying of unauthenticated traffic can occur.

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-2026-43505

prosody Alpine 3.24, Alpine 3.23 13.0.5-r0

alpine advisories ALPINE-CVE-2026-43505

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-2026-43505 updated 2026-06-28 cvss 6.5

Prosody: mod_proxy65: Prosody: Unauthorized traffic relay via mod_proxy65 access control flaw

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

0.20% chance of exploitation in the next 30 days, higher than 10% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

Affected products

Prosody Prosody

Classification

Weakness

CWE-420 Unprotected Alternate Channel

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-2026-43505
NVD CVE-2026-43505

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