CVE-2026-18157

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-07-31. a secondary CVSS source baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

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

A flaw was found in yggdrasil-worker-package-manager. A local attacker with existing access to the system could exploit an argument injection vulnerability in the APT backend. This allows specially crafted package names, which begin with a hyphen, to be misinterpreted as command options by apt-get. Successful exploitation could lead to remote code execution (RCE) with root privileges, enabling the attacker to fully compromise the system's integrity, confidentiality, and availability.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
35(Track)
EG Risk 35/100SSVC: 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
Severity78% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
16%
KEV
Not listed

Published

July 31, 2026

Last Modified

August 3, 2026

Advisory Details (5)

Auto-updated Jul 31, 2026
Patch available. Sources: redhat, github_commit, github_release.
github_release Patch Available

Version 0.2.4

Patch available: RedHatInsights/yggdrasil-worker-package-manager 0.2.4

https://github.com/RedHatInsights/yggdrasil-worker-package-manager/releases/tag/0.2.4
github_release Patch Available

Version 0.1.4

Patch available: RedHatInsights/yggdrasil-worker-package-manager 0.1.4

https://github.com/RedHatInsights/yggdrasil-worker-package-manager/releases/tag/0.1.4
github_commit Patch Available

commit 959745bb5917 (RedHatInsights/yggdrasil-worker-package-manager)

Patch available: RedHatInsights/yggdrasil-worker-package-manager 0.2.4 (contains commit 959745bb5917)

https://github.com/RedHatInsights/yggdrasil-worker-package-manager/commit/959745bb5917c17f0316af199aace6c71baa5ad7
redhat

2465250 – (CVE-2026-18157) CVE-2026-18157 yggdrasil-worker-package-manager: yggdrasil-worker-package-manager: Remote Code Execution via APT Argument Injection

https://bugzilla.redhat.com/show_bug.cgi?id=2465250
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-18157

Vendor Advisories for CVE-2026-18157(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 21× in last 7d / 96× 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 183 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-18157?
CVE-2026-18157 is a high vulnerability published on July 31, 2026. A flaw was found in yggdrasil-worker-package-manager. A local attacker with existing access to the system could exploit an argument injection vulnerability in the APT backend. This allows specially crafted package names, which begin with a hyphen, to be misinterpreted as command options by apt-get.…
When was CVE-2026-18157 disclosed?
CVE-2026-18157 was first published in the National Vulnerability Database on July 31, 2026, with the most recent update on August 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18157 actively exploited?
CVE-2026-18157 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 84.5% of all scored CVEs.
What is the CVSS score of CVE-2026-18157?
CVE-2026-18157 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-18157?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18157, 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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