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: 0.4%CVSS: 7.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
7.8HIGHmedium confidence
EG Risk
35
EG Risk 35/100CISA SSVC

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%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
27th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

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
redhatMentions a patch (unverified)

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 14× in last 7d / 75× 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 227 total refreshes for this CVE.

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

Related CVEs(same CWE)

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 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 0.4% probability of exploitation in the next 30 days (27th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-18157?
CVE-2026-18157 has a CVSS base score of 7.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-18157?
A fix for CVE-2026-18157 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-18157 are linked in the Vendor Advisories panel on this page.

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