CVE-2026-34933

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.5 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 89% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: Elevated riskExposed: 0

A fix is available — apply it.

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.

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
41(Track)
EG Risk 41/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity55% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
10%
KEV
Not listed

Published

April 3, 2026

Last Modified

July 24, 2026

Advisory Details (4)

Auto-updated Jul 25, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit, github_pr.
github Patch Available🟡 PoC Available

Reachable assertion in transport_flags_from_domain (CVE-2026-34933) · Advisory · avahi/avahi · GitHub

https://github.com/avahi/avahi/security/advisories/GHSA-w65r-6gxh-vhvc
generic🟡 PoC Available

oss-security - Avahi: Reachable assertion in transport_flags_from_domain (CVE-2026-34933)

http://www.openwall.com/lists/oss-security/2026/04/11/9
github_pr

core: refuse to accept publish flags where both wide_area and multicast are set

Fix merged in avahi/avahi PR #891 on 2026-04-01 — awaiting tagged release

https://github.com/avahi/avahi/pull/891
github_commit

commit 625ca0fac192 (avahi/avahi)

Fix landed in avahi/avahi commit 625ca0fac192 — awaiting tagged release

https://github.com/avahi/avahi/commit/625ca0fac19229f6dfa3a6c6b698ae657187e50c

Vendor Advisories for CVE-2026-34933(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntupython-avahi (0.7-4ubuntu7.3+esm2) @ focal2026-07-26ubuntu
redhatavahi-main-0.9~rc4-0.1.hum12026-04-28redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(5 across 5 ecosystems)
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
avahi—0.8-r26—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
avahi0.8-10 ... 0.8-9 (17 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
avahi0.8-10 ... 0.8-18 (10 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
avahi0.8-16, 0.8-17, 0.8-18——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
avahi0.8-16, 0.8-17, 0.8-18——

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 7× in last 7d / 29× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 174 total refreshes for this CVE.

  1. 2026-09-15 03:11 UTCEPSS rescore
  2. 2026-09-13 16:47 UTCEPSS rescore
  3. 2026-09-12 15:01 UTCEPSS rescore
  4. 2026-09-11 14:53 UTCEPSS rescore
  5. 2026-09-11 09:37 UTCEPSS rescore
  6. 2026-09-10 09:34 UTCEPSS rescore
  7. 2026-09-08 22:00 UTCEPSS rescore
  8. 2026-09-07 16:01 UTCEPSS rescore
  9. 2026-09-06 13:47 UTCEPSS rescore
  10. 2026-09-04 05:06 UTCEPSS rescore
  11. 2026-09-02 14:12 UTCEPSS rescore
  12. 2026-09-02 10:04 UTCOSV refresh
  13. 2026-09-01 13:53 UTCEPSS rescore
  14. 2026-09-01 04:39 UTCEPSS rescore
  15. 2026-08-30 19:17 UTCEPSS rescore
  16. 2026-08-30 01:22 UTCEPSS rescore
  17. 2026-08-28 21:41 UTCEPSS rescore
  18. 2026-08-27 14:25 UTCEPSS rescore
  19. 2026-08-26 14:46 UTCEPSS rescore
  20. 2026-08-25 13:49 UTCEPSS rescore
  21. 2026-08-23 00:19 UTCEPSS rescore
  22. 2026-08-21 23:49 UTCEPSS rescore
  23. 2026-08-20 22:55 UTCEPSS rescore
  24. 2026-08-19 17:03 UTCEPSS rescore
  25. 2026-08-18 13:48 UTCEPSS rescore
Show 75 more
  1. 2026-08-17 13:47 UTCEPSS rescore
  2. 2026-08-16 14:56 UTCEPSS rescore
  3. 2026-08-16 08:33 UTCEG score recompute
  4. 2026-08-16 08:33 UTCVendor advisory
  5. 2026-08-16 02:14 UTCEPSS rescore
  6. 2026-08-15 01:30 UTCEPSS rescore
  7. 2026-08-14 05:40 UTCEG score recompute
  8. 2026-08-14 05:40 UTCVendor advisory
  9. 2026-08-13 22:00 UTCEPSS rescore
  10. 2026-08-12 19:56 UTCEG score recompute
  11. 2026-08-12 19:56 UTCVendor advisory
  12. 2026-08-12 13:50 UTCEPSS rescore
  13. 2026-08-11 07:07 UTCEG score recompute
  14. 2026-08-11 07:07 UTCVendor advisory
  15. 2026-08-11 00:00 UTCEPSS rescore
  16. 2026-08-10 06:10 UTCEG score recompute
  17. 2026-08-10 06:10 UTCVendor advisory
  18. 2026-08-09 13:46 UTCEPSS rescore
  19. 2026-08-09 05:11 UTCEG score recompute
  20. 2026-08-09 05:11 UTCVendor advisory
  21. 2026-08-08 16:37 UTCEPSS rescore
  22. 2026-08-07 15:18 UTCEG score recompute
  23. 2026-08-07 15:18 UTCVendor advisory
  24. 2026-08-06 13:46 UTCEPSS rescore
  25. 2026-08-06 00:15 UTCEG score recompute
  26. 2026-08-06 00:15 UTCVendor advisory
  27. 2026-08-05 19:17 UTCEPSS rescore
  28. 2026-08-04 15:10 UTCEPSS rescore
  29. 2026-08-04 10:38 UTCEPSS rescore
  30. 2026-08-03 22:36 UTCEG score recompute
  31. 2026-08-03 22:36 UTCVendor advisory
  32. 2026-08-03 10:36 UTCEPSS rescore
  33. 2026-08-02 14:32 UTCEG score recompute
  34. 2026-08-02 14:32 UTCVendor advisory
  35. 2026-08-02 02:27 UTCEPSS rescore
  36. 2026-08-01 04:16 UTCEPSS rescore
  37. 2026-07-30 16:28 UTCEPSS rescore
  38. 2026-07-30 01:30 UTCEPSS rescore
  39. 2026-07-27 14:13 UTCEPSS rescore
  40. 2026-07-26 14:54 UTCEPSS rescore
  41. 2026-07-26 14:54 UTCEPSS rescore
  42. 2026-07-26 09:14 UTCEG score recompute
  43. 2026-07-26 09:14 UTCVendor advisory
  44. 2026-07-25 14:18 UTCEPSS rescore
  45. 2026-07-25 14:18 UTCEPSS rescore
  46. 2026-07-24 14:17 UTCEPSS rescore
  47. 2026-07-24 14:17 UTCEPSS rescore
  48. 2026-07-23 14:18 UTCEPSS rescore
  49. 2026-07-23 14:18 UTCEPSS rescore
  50. 2026-07-23 03:09 UTCEG score recompute
  51. 2026-07-22 14:08 UTCEPSS rescore
  52. 2026-07-21 15:24 UTCEPSS rescore
  53. 2026-07-20 17:08 UTCEPSS rescore
  54. 2026-07-19 14:31 UTCEPSS rescore
  55. 2026-07-19 02:29 UTCEPSS rescore
  56. 2026-07-18 10:04 UTCEPSS rescore
  57. 2026-07-17 02:54 UTCOSV refresh
  58. 2026-07-16 17:03 UTCEPSS rescore
  59. 2026-07-15 16:57 UTCEPSS rescore
  60. 2026-07-15 16:57 UTCEPSS rescore
  61. 2026-07-15 02:00 UTCEPSS rescore
  62. 2026-07-13 22:30 UTCEPSS rescore
  63. 2026-07-13 06:13 UTCEPSS rescore
  64. 2026-07-13 06:13 UTCEPSS rescore
  65. 2026-07-12 05:46 UTCEPSS rescore
  66. 2026-07-11 08:27 UTCEPSS rescore
  67. 2026-07-09 19:10 UTCEPSS rescore
  68. 2026-07-08 15:15 UTCEPSS rescore
  69. 2026-07-07 13:46 UTCEPSS rescore
  70. 2026-07-06 16:27 UTCEPSS rescore
  71. 2026-07-06 16:27 UTCEPSS rescore
  72. 2026-07-06 02:23 UTCEPSS rescore
  73. 2026-07-06 02:23 UTCEPSS rescore
  74. 2026-07-05 02:30 UTCEPSS rescore
  75. 2026-07-04 06:31 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-34933?
CVE-2026-34933 is a medium vulnerability published on April 3, 2026. 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…
When was CVE-2026-34933 disclosed?
CVE-2026-34933 was first published in the National Vulnerability Database on April 3, 2026, with the most recent update on July 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-34933 actively exploited?
CVE-2026-34933 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 89.6% of all scored CVEs.
What is the CVSS score of CVE-2026-34933?
CVE-2026-34933 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-34933?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-34933, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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