CVE-2026-84838

HIGHPre-NVD 7.87.8—
EchelonGraph scoreHIGH confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-02. a secondary CVSS source baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 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: 1%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 rpmuncompress. This command injection vulnerability allows a local attacker to execute arbitrary commands. This occurs when rpmuncompress processes a specially crafted archive filename containing shell metacharacters, which are not properly escaped before being passed to shell command strings. Successful exploitation requires user interaction, where a user or automated workflow invokes rpmuncompress on the malicious file, leading to high impact on the confidentiality, integrity, and availability of data accessible to the invoking user.

CVSS v3
7.8
EG Score
7.8(high)
EG Risk
36(Track)
EG Risk 36/100SSVC: 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%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
62%
KEV
Not listed

Published

September 2, 2026

Last Modified

September 3, 2026

Advisory Details (2)

Auto-updated Sep 2, 2026
Patch available. Sources: redhat.
redhat

2462222 – (CVE-2026-84838) CVE-2026-84838 rpm: Command injection in rpmuncompress via unescaped filenames passed to popen()

https://bugzilla.redhat.com/show_bug.cgi?id=2462222
redhat Patch Available

CVE-2026-84838 - 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-2026-84838

Vendor Advisories for CVE-2026-84838(2)

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

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
rpm4.18.0+dfsg-1 ... 6.1.0-1 (20 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
rpm4.20.1+dfsg-3, 6.0.0-1, 6.0.0-2, 6.0.1-1, 6.1.0-1——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
rpm4.20.1+dfsg-3, 6.0.0-1, 6.0.0-2, 6.0.1-1, 6.1.0-1——

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 39× in last 7d / 86× 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. 2026-09-19 02:46 UTCEG score recompute
  2. 2026-09-19 02:46 UTCVendor advisory
  3. 2026-09-19 02:46 UTCGHSA enrichment
  4. 2026-09-18 19:28 UTCEPSS rescore
  5. 2026-09-18 14:38 UTCVendor advisory
  6. 2026-09-18 14:38 UTCGHSA enrichment
  7. 2026-09-18 02:29 UTCEG score recompute
  8. 2026-09-18 02:29 UTCVendor advisory
  9. 2026-09-18 02:29 UTCGHSA enrichment
  10. 2026-09-17 19:32 UTCEPSS rescore
  11. 2026-09-17 14:20 UTCVendor advisory
  12. 2026-09-17 14:20 UTCGHSA enrichment
  13. 2026-09-17 02:11 UTCEG score recompute
  14. 2026-09-17 02:11 UTCVendor advisory
  15. 2026-09-17 02:11 UTCGHSA enrichment
  16. 2026-09-16 14:09 UTCEPSS rescore
  17. 2026-09-16 14:01 UTCEG score recompute
  18. 2026-09-16 14:01 UTCVendor advisory
  19. 2026-09-16 14:01 UTCGHSA enrichment
  20. 2026-09-16 05:15 UTCEPSS rescore
  21. 2026-09-16 01:22 UTCVendor advisory
  22. 2026-09-16 01:22 UTCGHSA enrichment
  23. 2026-09-15 13:13 UTCEG score recompute
  24. 2026-09-15 13:13 UTCVendor advisory
  25. 2026-09-15 13:13 UTCGHSA enrichment
Show 61 more
  1. 2026-09-15 03:12 UTCEPSS rescore
  2. 2026-09-15 03:12 UTCEPSS rescore
  3. 2026-09-15 01:04 UTCVendor advisory
  4. 2026-09-15 01:04 UTCGHSA enrichment
  5. 2026-09-14 12:55 UTCVendor advisory
  6. 2026-09-14 12:55 UTCGHSA enrichment
  7. 2026-09-14 00:46 UTCEG score recompute
  8. 2026-09-14 00:46 UTCVendor advisory
  9. 2026-09-14 00:46 UTCGHSA enrichment
  10. 2026-09-13 12:38 UTCVendor advisory
  11. 2026-09-13 12:38 UTCGHSA enrichment
  12. 2026-09-13 00:29 UTCEG score recompute
  13. 2026-09-13 00:29 UTCVendor advisory
  14. 2026-09-13 00:29 UTCGHSA enrichment
  15. 2026-09-12 12:20 UTCVendor advisory
  16. 2026-09-12 12:20 UTCGHSA enrichment
  17. 2026-09-12 00:11 UTCEG score recompute
  18. 2026-09-12 00:11 UTCVendor advisory
  19. 2026-09-12 00:11 UTCGHSA enrichment
  20. 2026-09-11 14:53 UTCEPSS rescore
  21. 2026-09-11 14:53 UTCEPSS rescore
  22. 2026-09-11 12:01 UTCEG score recompute
  23. 2026-09-11 12:01 UTCGHSA enrichment
  24. 2026-09-10 23:52 UTCGHSA enrichment
  25. 2026-09-10 11:41 UTCEG score recompute
  26. 2026-09-10 11:41 UTCGHSA enrichment
  27. 2026-09-09 23:32 UTCGHSA enrichment
  28. 2026-09-09 11:23 UTCVendor advisory
  29. 2026-09-09 11:22 UTCGHSA enrichment
  30. 2026-09-08 23:13 UTCEG score recompute
  31. 2026-09-08 23:13 UTCVendor advisory
  32. 2026-09-08 23:13 UTCGHSA enrichment
  33. 2026-09-08 22:01 UTCEPSS rescore
  34. 2026-09-08 07:54 UTCVendor advisory
  35. 2026-09-08 07:54 UTCGHSA enrichment
  36. 2026-09-07 19:43 UTCEG score recompute
  37. 2026-09-07 19:43 UTCVendor advisory
  38. 2026-09-07 19:43 UTCGHSA enrichment
  39. 2026-09-07 07:34 UTCVendor advisory
  40. 2026-09-07 07:34 UTCGHSA enrichment
  41. 2026-09-06 19:19 UTCEG score recompute
  42. 2026-09-06 19:19 UTCGHSA enrichment
  43. 2026-09-06 13:48 UTCEPSS rescore
  44. 2026-09-06 07:09 UTCGHSA enrichment
  45. 2026-09-05 19:00 UTCEG score recompute
  46. 2026-09-05 19:00 UTCGHSA enrichment
  47. 2026-09-05 15:31 UTCEPSS rescore
  48. 2026-09-05 06:51 UTCGHSA enrichment
  49. 2026-09-04 18:42 UTCEG score recompute
  50. 2026-09-04 18:42 UTCGHSA enrichment
  51. 2026-09-04 06:30 UTCEG score recompute
  52. 2026-09-04 06:30 UTCGHSA enrichment
  53. 2026-09-04 05:07 UTCEPSS rescore
  54. 2026-09-03 18:19 UTCGHSA enrichment
  55. 2026-09-03 18:06 UTCGHSA enrichment
  56. 2026-09-03 05:47 UTCEG score recompute
  57. 2026-09-03 05:47 UTCGHSA enrichment
  58. 2026-09-02 17:38 UTCEG score recompute
  59. 2026-09-02 16:18 UTCEG score recompute
  60. 2026-09-02 15:27 UTCEG score recompute
  61. 2026-09-02 15:26 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-84838?
CVE-2026-84838 is a high vulnerability published on September 2, 2026. A flaw was found in rpmuncompress. This command injection vulnerability allows a local attacker to execute arbitrary commands. This occurs when rpmuncompress processes a specially crafted archive filename containing shell metacharacters, which are not properly escaped before being passed to shell…
When was CVE-2026-84838 disclosed?
CVE-2026-84838 was first published in the National Vulnerability Database on September 2, 2026, with the most recent update on September 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-84838 actively exploited?
CVE-2026-84838 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 37.7% of all scored CVEs.
What is the CVSS score of CVE-2026-84838?
CVE-2026-84838 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-84838?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-84838, 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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