CVE-2026-18874

MEDIUMPre-NVD 6.26.2—
EchelonGraph scoreHIGH confidence

Score 6.2 from GitHub Security Advisory published 2026-08-19. a secondary CVSS source baseline 6.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
6.2EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.2Exploit: None knownExposed: 0

A fix is available — apply it.

A flaw was found in volsync-addon-controller. This vulnerability allows an attacker to inject malicious YAML (Yet Another Markup Language) code into the OpenShift Lifecycle Manager (OLM) Subscription resource. This is due to improper escaping of annotation values when they are rendered into YAML. Successful exploitation could lead to unauthorized modification or control over OLM Subscription configurations, potentially impacting software management within the cluster. This issue primarily affects systems where the 'volsync-addon-deploy-type: olm' annotation is explicitly enabled.

CVSS v3
6.2
EG Score
6.2(high)
EG Risk
28(Track)
EG Risk 28/100SSVC: 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
Severity62% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
37%
KEV
Not listed

Published

August 19, 2026

Last Modified

September 8, 2026

Advisory Details (2)

Auto-updated Aug 19, 2026
Patch available. Sources: redhat.
redhat

2511115 – (CVE-2026-18874) CVE-2026-18874 volsync-addon-controller: volsync-addon-controller: annotation values rendered into YAML via text/template without escaping allows YAML injection into Subscription

https://bugzilla.redhat.com/show_bug.cgi?id=2511115
redhat Patch Available

CVE-2026-18874 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-18874

Vendor Advisories for CVE-2026-18874(7)

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

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatrhacm2/acm-volsync-addon-controller-rhel9:17872663602026-08-26redhat
redhatrhacm2/acm-volsync-addon-controller-rhel9:17872665642026-08-26redhat
redhatrhacm2/acm-volsync-addon-controller-rhel9:17872665562026-08-26redhat
redhatrhacm2/acm-volsync-addon-controller-rhel9:17876835602026-08-26redhat

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.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 23× in last 7d / 123× 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 128 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-18874?
CVE-2026-18874 is a medium vulnerability published on August 19, 2026. A flaw was found in volsync-addon-controller. This vulnerability allows an attacker to inject malicious YAML (Yet Another Markup Language) code into the OpenShift Lifecycle Manager (OLM) Subscription resource. This is due to improper escaping of annotation values when they are rendered into YAML.…
When was CVE-2026-18874 disclosed?
CVE-2026-18874 was first published in the National Vulnerability Database on August 19, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18874 actively exploited?
CVE-2026-18874 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 63.3% of all scored CVEs.
What is the CVSS score of CVE-2026-18874?
CVE-2026-18874 has a CVSS v3 base score of 6.2 (NVD).
How do I remediate CVE-2026-18874?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18874, 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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