CVE-2025-66506VulnerabilityPublished 17 Feb 2026Updated 8 Oct 2026

Red Hat Security Advisory: OpenShift Security Profiles Operator bug fix and enhancement update

Affects Red Hat OpenShiftSource GCVE Database

Authoritative record:CVE-2025-66506· High 7.5

Not known to be exploited · CVSS 7.5 High : upgrade Red Hat fulcio to 1.8.3 soon.

Data as of 26 Oct 2026, 09:15 UTC

CVSS 3.1 base score

7.5High

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.2% chance of exploitation in 30 days – higher than 11% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 1.8.3

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitation evidence

Disclosed: evidence found.
CVE published 4 Dec 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade github.com/sigstore/fulcio to 1.8.3.

Affected software

Product	Affected	Fixed in
Gogithub.com/sigstore/fulcio`pkg:golang/github.com/sigstore/fulcio`Other threats	Affected <1.8.3	Fixed in 1.8.3

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Red Hat has released Security Profiles Operator version 0.10.0 which includes fixes for this vulnerability and other bugs. Users should ensure all previously released errata relevant to their systems are applied before updating. The update process is documented by Red Hat. No additional mitigations are specified beyond applying the official update. There is no indication that the vulnerability is already mitigated or that no action is required.

Description

The Security Profiles Operator v0.10.0 is now available. See the documentation for release information: https://docs.redhat.com/en/documentation/openshift_container_platform/latest/html/security_and_compliance/security-profiles-operator

Impact

The vulnerability can cause denial of service due to resource exhaustion (memory and CPU) when processing malicious OIDC tokens. This can lead to service unavailability in affected Red Hat products that use Fulcio, including the OpenShift Security Profiles Operator. There is no indication of confidentiality or integrity impact. No known exploits in the wild have been reported. The issue affects availability and could disrupt normal operations of the affected components.

Summary

CVE-2025-66506 is a denial of service vulnerability in Fulcio, a certificate authority used by Red Hat products for code signing. The vulnerability arises from excessive memory allocation when processing a specially crafted OpenID Connect (OIDC) token containing many period characters, leading to resource exhaustion and potential service unavailability. This affects Red Hat products that utilize Fulcio, including the OpenShift Security Profiles Operator. Red Hat released version 0.10.0 of the Security Profiles Operator to fix this and other related bugs. The advisory references multiple bug fixes related to pod startup failures and container creation errors. The vulnerability is classified under CWE-405 (Asymmetric Resource Consumption). Red Hat rates this vulnerability as important and assigns a CVSS base score of 7.5 (high) for their products, although no official CVSS score is published in the advisory. The vendor recommends applying all previous errata before updating to the fixed version.

CWE-405Asymmetric Resource Consumption (Amplification) (opens in a new tab)
Class weakness
The product does not properly control situations in which an adversary can cause the product to consume or produce excessive resources without requiring the adversary to invest equivalent work or otherwise prove authorization, i.e., the adversary's influence is "asymmetric."
Architecture and Design
An application must make resources available to a client commensurate with the client's access level.
Architecture and Design
An application must, at all times, keep track of allocated resources and meter their usage appropriately.
System Configuration
Consider disabling resource-intensive algorithms on the server side, such as Diffie-Hellman key exchange.
OWASP Cheat Sheets
File Upload (opens in a new tab)
OWASP ASVS 4.0.3
V12.1.1 (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 14 Aug 2026, 21:37 UTC

WeaknessesCWE-405

Technical details

References

Community reviews

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