How severe is CVE-2026-34933?

CVE-2026-34933 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-34933 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34933?

CVE-2026-34933 primarily affects Avahi. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-34933?

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

Does CVE-2026-34933 have an EU (EUVD) identifier?

Yes. CVE-2026-34933 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18910.

When was CVE-2026-34933 published?

CVE-2026-34933 was published on 2026-04-03 and last updated on 2026-06-17.

CVE-2026-34933

CVE-2026-34933 is a medium-severity vulnerability in Avahi with a CVSS 3.x base score of 5.5. 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-617.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
EPSS exploit prediction: 0% (10th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-18910
Weakness: CWE-617
Affected product: Avahi
Published: 2026-04-03
Last modified: 2026-06-17

Description

Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. Prior to version 0.9-rc4, any unprivileged local user can crash avahi-daemon by sending a single D-Bus method call with conflicting publish flags. This issue has been patched in version 0.9-rc4.

Frequently asked questions

What is CVE-2026-34933?: Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. Prior to version 0.9-rc4, any unprivileged local user can crash avahi-daemon by sending a single D-Bus method call with conflicting publish flags. This issue has been patched in version 0.9-rc4.
How severe is CVE-2026-34933?: CVE-2026-34933 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-34933 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34933?: CVE-2026-34933 primarily affects Avahi. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-34933?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-34933 have an EU (EUVD) identifier?: Yes. CVE-2026-34933 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18910.
When was CVE-2026-34933 published?: CVE-2026-34933 was published on 2026-04-03 and last updated on 2026-06-17.

References

Affected products (4)

cpe:2.3:a:avahi:avahi:*:*:*:*:*:*:*:*
cpe:2.3:a:avahi:avahi:0.9:rc1:*:*:*:*:*:*
cpe:2.3:a:avahi:avahi:0.9:rc2:*:*:*:*:*:*
cpe:2.3:a:avahi:avahi:0.9:rc3:*:*:*:*:*:*

More vulnerabilities in Avahi

CVE-2017-6519 — Critical (CVSS 9.1): avahi-daemon in Avahi through 0.6.32 and 0.7 inadvertently responds to IPv6 unicast queries with source addresses that…
CVE-2021-26720 — High (CVSS 7.8): avahi-daemon-check-dns.sh in the Debian avahi package through 0.8-4 is executed as root via…
CVE-2026-24401 — Medium (CVSS 6.5): Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. In…
CVE-2025-68471 — Medium (CVSS 6.5): Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. In 0.9-rc2…
CVE-2025-68468 — Medium (CVSS 6.5): Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. In 0.9-rc2…
CVE-2023-38473 — Medium (CVSS 6.2): A vulnerability was found in Avahi. A reachable assertion exists in the avahi_alternative_host_name() function.

All CVEs affecting Avahi →

Other CWE-617 (Reachable Assertion) vulnerabilities

CVE-2020-3615 — Critical (CVSS 9.8): Valid deauth/disassoc frames is dropped in case if RMF is enabled and some rouge peer keep on sending rogue…
CVE-2019-9795 — Critical (CVSS 9.8): A vulnerability where type-confusion in the IonMonkey just-in-time (JIT) compiler could potentially be used by…
CVE-2026-31739 — High (CVSS 8.8): In the Linux kernel, the following vulnerability has been resolved: crypto: tegra - Add missing CRYPTO_ALG_ASYNC The…
CVE-2020-12417 — High (CVSS 8.8): Due to confusion about ValueTags on JavaScript Objects, an object may pass through the type barrier, resulting in…
CVE-2020-6623 — High (CVSS 8.8): stb stb_truetype.h through 1.22 has an assertion failure in stbtt__cff_get_index.
CVE-2020-6619 — High (CVSS 8.8): stb stb_truetype.h through 1.22 has an assertion failure in stbtt__buf_seek.

Browse all CWE-617 (Reachable Assertion) vulnerabilities →