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No exploitation reportedFix available

CVE-2026-4897

No exploitation reported by the sources we read.

  • Published2026-03-26
  • WeaknessCWE-770

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2026-03-2615:16CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-4897?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-4897?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Redhat enterprise linux
BranchAffectedFixed in
6.0= 6.0no fix published
7.0= 7.0no fix published
8.0= 8.0no fix published
9.0= 9.0no fix published
10.0= 10.0no fix published
Freedesktop polkit
BranchAffectedFixed in
—all versionsno fix published
Redhat openshift container platform
BranchAffectedFixed in
4.0= 4.0no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA8 products

As redhat, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

2 more products in the CVE record.

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-09-10

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • expatSUSE:Linux Micro 6.2all versions · fixed in 2.7.1-160000.5.1
  • policykit-1Ubuntu:Pro:16.04:LTSall versions · no fixed version listed
  • policykit-1Ubuntu:Pro:14.04:LTSall versions · no fixed version listed
  • policykit-1Ubuntu:25.10all versions · fixed in 126-2ubuntu0.1
  • policykit-1Ubuntu:24.04:LTSall versions · fixed in 124-2ubuntu1.24.04.3
  • policykit-1Ubuntu:22.04:LTSall versions · fixed in 0.105-33ubuntu0.1
  • policykit-1Ubuntu:20.04:LTSall versions · no fixed version listed
  • policykit-1Ubuntu:18.04:LTSall versions · no fixed version listed

30 more package ranges on OSV.dev

Vendor advisories

  • RHSA-2026:66287 Red Hat Product Security9 products fixed

    Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

Full record on NVD

Fix

  1. Vendor fix Red Hat Product Security RHSA-2026:66287 · 9 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/
  2. Workaround from the vendor Red Hat Product Security RHSA-2026:66287 · 9 productsMitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVE recordread 2026-10-23
  • CISA-ADPSSVC decisionnone2026-03-28
  • OpenCVESSVC decisionnone—
  • CNACVSS 3.15.5known since 2026-10-23
  • CNAweakness (CWE)CWE-770known since 2026-10-23
  • FIRST EPSSEPSS score0.2 %2026-11-03
  • OSVaffected packages—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Published
2026-03-26
Last Modified
2026-09-10
NVD status
Modified

Frequently asked questions

What is CVE-2026-4897?

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.

Is CVE-2026-4897 actively exploited?

Active exploitation of CVE-2026-4897 has not been confirmed. Its EPSS score was 0.2% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-4897?

CVE-2026-4897 has a CVSS v3 base score of 5.5 (MEDIUM severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

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Sources for this record