CVE-2026-4897

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-03-26. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: None knownExposed: 0

A fix is available — apply it.

A flaw was found in polkit. A local user can exploit this by providing a specially crafted, excessively long input to the polkit-agent-helper-1 setuid binary via standard input (stdin). This unbounded input can lead to an out-of-memory (OOM) condition, resulting in a Denial of Service (DoS) for the system.

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
25(Track)
EG Risk 25/100SSVC: 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
Severity55% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
5%
KEV
Not listed

Published

March 26, 2026

Last Modified

September 10, 2026

Advisory Details (2)

Auto-updated Aug 6, 2026
Patch available. Sources: redhat.
redhat

2451739 – (CVE-2026-4897) CVE-2026-4897 polkit: Polkit: Denial of Service via unbounded input processing through standard input

https://bugzilla.redhat.com/show_bug.cgi?id=2451739
redhat Patch Available

CVE-2026-4897 - 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-2026-4897

Vendor Advisories for CVE-2026-4897(3)

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

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntupolkitd (126-2ubuntu0.1) @ questing2026-09-10ubuntu
redhatpolkit-0:125-4.el10_2.12026-08-26redhat

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.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
policykit-10.105-31, 0.105-31+deb11u10.105-31+deb11u2—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
policykit-1122-3 ... 127-3 (15 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
policykit-1126-2, 127-1, 127-2, 127-3——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
policykit-1126-2, 127-1, 127-2127-3—

Weakness Classification(1)

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

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 4× in last 7d / 36× 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 187 total refreshes for this CVE.

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

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ubuntu:USN-8173-1

Frequently asked(5)

What is CVE-2026-4897?
CVE-2026-4897 is a medium vulnerability published on March 26, 2026. A flaw was found in polkit. A local user can exploit this by providing a specially crafted, excessively long input to the polkit-agent-helper-1 setuid binary via standard input (stdin). This unbounded input can lead to an out-of-memory (OOM) condition, resulting in a Denial of Service (DoS) for the…
When was CVE-2026-4897 disclosed?
CVE-2026-4897 was first published in the National Vulnerability Database on March 26, 2026, with the most recent update on September 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-4897 actively exploited?
CVE-2026-4897 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 95.2% of all scored CVEs.
What is the CVSS score of CVE-2026-4897?
CVE-2026-4897 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-4897?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-4897, 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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