How severe is CVE-2026-43506?

CVE-2026-43506 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-2026-43506 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-43506?

CVE-2026-43506 affects Prosody. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-43506?

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

Does CVE-2026-43506 have an EU (EUVD) identifier?

Yes. CVE-2026-43506 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-26659.

When was CVE-2026-43506 published?

CVE-2026-43506 was published on 2026-05-01 and last updated on 2026-06-17.

CVE-2026-43506

CVE-2026-43506 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-401.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-26659
Weakness: CWE-401
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 memory leaks from unauthenticated connections.

Frequently asked questions

What is CVE-2026-43506?: 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.
How severe is CVE-2026-43506?: CVE-2026-43506 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-2026-43506 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-43506?: CVE-2026-43506 affects Prosody. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-43506?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-43506 have an EU (EUVD) identifier?: Yes. CVE-2026-43506 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-26659.
When was CVE-2026-43506 published?: CVE-2026-43506 was published on 2026-05-01 and last updated on 2026-06-17.

References

Affected products (1)

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

More vulnerabilities in Prosody

CVE-2014-2745 — High (CVSS 7.8): Prosody before 0.9.4 does not properly restrict the processing of compressed XML elements, which allows remote…
CVE-2014-2744 — High (CVSS 7.8): plugins/mod_compression.lua in (1) Prosody before 0.9.4 and (2) Lightwitch Metronome through 3.4 negotiates stream…
CVE-2022-0217 — High (CVSS 7.5): It was discovered that an internal Prosody library to load XML based on libexpat does not properly restrict the XML…
CVE-2021-37601 — High (CVSS 7.5): muc.lib.lua in Prosody 0.11.0 through 0.11.9 allows remote attackers to obtain sensitive information (list of admins,…
CVE-2021-32920 — High (CVSS 7.5): Prosody before 0.11.9 allows Uncontrolled CPU Consumption via a flood of SSL/TLS renegotiation requests.
CVE-2021-32919 — High (CVSS 7.5): An issue was discovered in Prosody before 0.11.9. The undocumented dialback_without_dialback option in mod_dialback…

All CVEs affecting Prosody →

Other CWE-401 (Missing Release of Memory after Effective Lifetime) vulnerabilities

CVE-2026-46289 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: lib/scatterlist: fix length calculations in…
CVE-2022-0742 — Critical (CVSS 9.1): Memory leak in icmp6 implementation in Linux Kernel 5.13+ allows a remote attacker to DoS a host by making it go…
CVE-2024-25450 — High (CVSS 8.8): imlib2 v1.9.1 was discovered to mishandle memory allocation in the function init_imlib_fonts().
CVE-2023-33718 — High (CVSS 8.8): mp4v2 v2.1.3 was discovered to contain a memory leak via MP4File::ReadString() at mp4file_io.cpp
CVE-2021-40633 — High (CVSS 8.8): A memory leak (out-of-memory) in gif2rgb in util/gif2rgb.c in giflib 5.1.4 allows remote attackers trigger an out of…
CVE-2021-3492 — High (CVSS 8.8): Shiftfs, an out-of-tree stacking file system included in Ubuntu Linux kernels, did not properly handle faults occurring…

Browse all CWE-401 (Missing Release of Memory after Effective Lifetime) vulnerabilities →