Is CVE-2026-43507 in the CISA KEV catalog?

No. CVE-2026-43507 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-43507?

CVE-2026-43507 has a CVSS v3 base score of 5.3 (MEDIUM).

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

CVE-2026-43507 has an EPSS score of 0.35% (27th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-43507?

Upgrade prosody on debian 12 to 0.12.3-1+deb12u1 or later.

CVE & CISA-KEV Catalog

CVE-2026-43507

MEDIUM

5.3

CVSS v3

NVD

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.

CWE-770Allocation of Resources Without Limits or Throttling

How to fix

Remediation Available

prosodyDebian

Fixed in:0.12.3-1+deb12u1CVE-2026-43507

Fixed in:13.0.1-1+deb131uCVE-2026-43507

Fixed in:13.0.5-1CVE-2026-43507

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityLow

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Exploit Intelligence

0.35%probability of exploitation in 30 days

27thpercentile

Low risk: more likely to be exploited than 27% of all known CVEs.

References

Patch2

Third-Party Advisory1

blog.unionium.org

Related Vulnerabilities

Other CWE-770 (Allocation of Resources Without Limits or Throttling) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-50387	High	7.5	100%	-	Fix
CVE-2019-11478	Medium	5.3	95%	-	Fix
CVE-2019-11479	High	7.5	92%	-	Fix
CVE-2024-27316	High	7.5	91%	-	Fix
CVE-2022-30522	High	7.5	90%	-	Fix
CVE-2019-9515	High	7.5	88%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-01.