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No exploitation reportedFix available

CVE-2026-43507

No exploitation reported by the sources we read.

  • Published2026-05-01
  • Fixed in13.0.5 · 0.12.6
  • WeaknessCWE-770

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-05-0115:16CVE publishedNVD

Versions per branch

NVD
Prosody
BranchAffectedFixed in
13.0≥ 13.0.0, < 13.0.513.0.5
0.12< 0.12.60.12.6

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As mitre, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Prosodyother versions: not affected
    Affected
    • < 0.12.6fixed in 0.12.6semver
    • ≥ 1.0.0, < 13.0.5fixed in 13.0.5semver

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-05-01

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • prosodyUbuntu:Pro:18.04:LTSall versions · no fixed version listed
  • prosodyUbuntu:26.10all versions · no fixed version listed
  • prosodyUbuntu:26.04:LTSall versions · no fixed version listed
  • prosodyUbuntu:25.10all versions · no fixed version listed
  • prosodyUbuntu:24.04:LTSall versions · no fixed version listed
  • prosodyUbuntu:22.04:LTSall versions · no fixed version listed
  • prosodyUbuntu:20.04:LTSall versions · no fixed version listed
  • prosodyUbuntu:16.04:LTSall versions · no fixed version listed

7 more package ranges on OSV.dev

Full record on NVD

Fix

  1. Update Prosody to 13.0.5 · 0.12.6

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2026-05-01
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-q9r3-wmh7-jgmq

Frequently asked questions

What is CVE-2026-43507?

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.

Is CVE-2026-43507 actively exploited?

Active exploitation of CVE-2026-43507 has not been confirmed. Its EPSS score was 0.3% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-43507?

CVE-2026-43507 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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Sources for this record