How severe is CVE-2026-43507?

CVE-2026-43507 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2026-43507 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-43507?

CVE-2026-43507 affects Prosody. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-43507?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-43507 have an EU (EUVD) identifier?

Yes. CVE-2026-43507 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-26660.

When was CVE-2026-43507 published?

CVE-2026-43507 was published on 2026-05-01 and last updated on 2026-06-17.

CVE-2026-43507

CVE-2026-43507 is a medium-severity vulnerability in Prosody with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-770.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 0% (27th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-26660
Weakness: CWE-770
Affected product: Prosody
Published: 2026-05-01
Last modified: 2026-06-17

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.

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.
How severe is CVE-2026-43507?: CVE-2026-43507 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2026-43507 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-43507?: CVE-2026-43507 affects Prosody. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-43507?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-43507 have an EU (EUVD) identifier?: Yes. CVE-2026-43507 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-26660.
When was CVE-2026-43507 published?: CVE-2026-43507 was published on 2026-05-01 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:prosody:prosody:*:*:*:*:*:*:*:*

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