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CVE-2026-88837 Red Hat CVE debrief

CVE-2026-88837 debrief based on the supplied source corpus. The CVE record was published on 2026-09-23T18:17:10.493Z and was last modified on 2026-09-25T23:16:54.793Z. The NVD entry is currently Awaiting Analysis. BusyBox httpd incorrectly handles yescrypt ($y$) password hashes during Basic Authentication, treating them as plaintext and potentially allowing authentication bypass. Defenders should assess exposure and verify proper configuration of authentication mechanisms. The CVE description indicates potential authentication bypass for BusyBox httpd instances and the need to verify exposure and proper configuration of authentication mechanisms.

Vendor
Red Hat
Product
Red Hat Hardened Images
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-23
Original CVE updated
2026-09-25
Advisory published
2026-09-23
Advisory updated
2026-09-25

Who should care

Defenders responsible for BusyBox httpd instances, particularly those using Basic Authentication, should assess exposure and verify proper configuration.

Why it matters

CVE-2026-88837 allows potential authentication bypass in BusyBox httpd instances due to incorrect handling of yescrypt password hashes. Defenders should verify exposure, assess configuration, and monitor for potential authentication attempts.

  • Potential authentication bypass for BusyBox httpd instances
  • Need to verify exposure and proper configuration of authentication mechanisms
  • Possible impact on access control and system security

Technical summary

BusyBox httpd incorrectly handles yescrypt ($y$) password hashes during Basic Authentication, treating them as plaintext and potentially allowing authentication bypass. This incorrect handling can lead to authentication bypass in BusyBox httpd instances. Defenders should verify exposure of BusyBox httpd instances to authentication mechanisms and assess the impact of treating yescrypt password hashes as plaintext.

Defensive priority

Defenders should prioritize verifying exposure of BusyBox httpd instances to authentication mechanisms and assess the impact of treating yescrypt password hashes as plaintext.

Recommended defensive actions

  • Verify BusyBox httpd instances are properly configured and up-to-date
  • Assess authentication mechanisms for potential exposure
  • Monitor for potential authentication attempts

Evidence notes

The CVE description indicates that BusyBox httpd incorrectly handles yescrypt password hashes during Basic Authentication, potentially allowing authentication bypass.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-88837 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-88837

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-88837 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-88837

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.