CVE-2026-18157

HIGHPre-NVD 7.87.8—
EchelonGraph scoreHIGH 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(high)
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 29× in last 7d / 91× 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.

  1. 2026-08-21 06:32 UTCEG score recompute
  2. 2026-08-21 06:32 UTCGHSA enrichment
  3. 2026-08-20 22:55 UTCEPSS rescore
  4. 2026-08-20 18:50 UTCGHSA enrichment
  5. 2026-08-20 07:08 UTCGHSA enrichment
  6. 2026-08-19 19:27 UTCEG score recompute
  7. 2026-08-19 19:27 UTCGHSA enrichment
  8. 2026-08-19 17:03 UTCEPSS rescore
  9. 2026-08-19 07:15 UTCGHSA enrichment
  10. 2026-08-18 19:32 UTCEG score recompute
  11. 2026-08-18 19:32 UTCGHSA enrichment
  12. 2026-08-18 13:48 UTCEPSS rescore
  13. 2026-08-18 07:49 UTCGHSA enrichment
  14. 2026-08-17 20:08 UTCEG score recompute
  15. 2026-08-17 20:08 UTCGHSA enrichment
  16. 2026-08-17 13:47 UTCEPSS rescore
  17. 2026-08-17 08:20 UTCGHSA enrichment
  18. 2026-08-16 20:39 UTCEG score recompute
  19. 2026-08-16 20:39 UTCGHSA enrichment
  20. 2026-08-16 14:56 UTCEPSS rescore
  21. 2026-08-16 08:57 UTCEG score recompute
  22. 2026-08-16 08:57 UTCGHSA enrichment
  23. 2026-08-16 02:14 UTCEPSS rescore
  24. 2026-08-15 21:16 UTCGHSA enrichment
  25. 2026-08-15 09:34 UTCEG score recompute
Show 66 more
  1. 2026-08-15 09:34 UTCGHSA enrichment
  2. 2026-08-15 01:30 UTCEPSS rescore
  3. 2026-08-14 21:52 UTCGHSA enrichment
  4. 2026-08-14 10:11 UTCGHSA enrichment
  5. 2026-08-13 22:29 UTCEG score recompute
  6. 2026-08-13 22:29 UTCGHSA enrichment
  7. 2026-08-13 22:00 UTCEPSS rescore
  8. 2026-08-13 10:48 UTCGHSA enrichment
  9. 2026-08-12 23:06 UTCEG score recompute
  10. 2026-08-12 23:06 UTCGHSA enrichment
  11. 2026-08-12 13:50 UTCEPSS rescore
  12. 2026-08-12 11:25 UTCGHSA enrichment
  13. 2026-08-11 23:43 UTCEG score recompute
  14. 2026-08-11 23:43 UTCGHSA enrichment
  15. 2026-08-11 13:42 UTCEPSS rescore
  16. 2026-08-11 12:01 UTCGHSA enrichment
  17. 2026-08-11 00:20 UTCEG score recompute
  18. 2026-08-11 00:20 UTCGHSA enrichment
  19. 2026-08-11 00:00 UTCEPSS rescore
  20. 2026-08-10 12:38 UTCGHSA enrichment
  21. 2026-08-10 00:57 UTCEG score recompute
  22. 2026-08-10 00:57 UTCGHSA enrichment
  23. 2026-08-09 13:46 UTCEPSS rescore
  24. 2026-08-09 13:15 UTCGHSA enrichment
  25. 2026-08-09 01:34 UTCEG score recompute
  26. 2026-08-09 01:34 UTCGHSA enrichment
  27. 2026-08-08 16:37 UTCEPSS rescore
  28. 2026-08-08 13:53 UTCGHSA enrichment
  29. 2026-08-08 02:11 UTCEG score recompute
  30. 2026-08-08 02:11 UTCGHSA enrichment
  31. 2026-08-07 14:29 UTCGHSA enrichment
  32. 2026-08-07 02:48 UTCGHSA enrichment
  33. 2026-08-06 15:06 UTCEG score recompute
  34. 2026-08-06 15:06 UTCGHSA enrichment
  35. 2026-08-06 13:46 UTCEPSS rescore
  36. 2026-08-06 03:24 UTCEG score recompute
  37. 2026-08-06 03:24 UTCGHSA enrichment
  38. 2026-08-05 19:17 UTCEPSS rescore
  39. 2026-08-05 15:42 UTCGHSA enrichment
  40. 2026-08-05 04:00 UTCGHSA enrichment
  41. 2026-08-04 16:19 UTCEG score recompute
  42. 2026-08-04 16:19 UTCGHSA enrichment
  43. 2026-08-04 15:10 UTCEPSS rescore
  44. 2026-08-04 10:38 UTCEPSS rescore
  45. 2026-08-04 04:38 UTCGHSA enrichment
  46. 2026-08-03 16:56 UTCGHSA enrichment
  47. 2026-08-03 14:34 UTCEG score recompute
  48. 2026-08-03 14:34 UTCGHSA enrichment
  49. 2026-08-03 10:35 UTCEPSS rescore
  50. 2026-08-03 02:51 UTCGHSA enrichment
  51. 2026-08-02 15:10 UTCGHSA enrichment
  52. 2026-08-02 03:28 UTCEG score recompute
  53. 2026-08-02 03:28 UTCGHSA enrichment
  54. 2026-08-02 02:26 UTCEPSS rescore
  55. 2026-08-01 15:46 UTCEG score recompute
  56. 2026-08-01 15:46 UTCGHSA enrichment
  57. 2026-08-01 04:15 UTCEPSS rescore
  58. 2026-08-01 04:04 UTCEG score recompute
  59. 2026-08-01 04:04 UTCGHSA enrichment
  60. 2026-07-31 16:23 UTCEG score recompute
  61. 2026-07-31 16:23 UTCGHSA enrichment
  62. 2026-07-31 15:18 UTCGHSA enrichment
  63. 2026-07-31 03:37 UTCEG score recompute
  64. 2026-07-31 03:37 UTCGHSA enrichment
  65. 2026-07-31 02:50 UTCEG score recompute
  66. 2026-07-31 02:49 UTCMITRE cvelistV5first tracked

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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