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Back to active CVEs
High · CVSS 7.5CVE-2026-49329

Openshift/oauth-server: openshift/oauth-server: quadratic-time dos via accept-language header underscore bypass on unauthenticated login endpointsCVE-2026-49329

Answer in brief

CVE-2026-49329 records a High severity (CVSS 7.5) vulnerability in Openshift/oauth-server: openshift/oauth-server: quadratic-time dos via accept-language header underscore bypass on unauthenticated login endpoints. The current sources do not mark it as known exploited. The current feed maps Red Hat/openshift4/ose-oauth-server-rhel8 (generic), Red Hat/openshift4/ose-oauth-server-rhel9 (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 1, 2026Updated Oct 15, 2026Source checked Oct 16, 2026First seen by HOL Sep 1, 2026Material review Oct 15, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.5
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Red Hat/openshift4/ose-oauth-server-rhel8 (generic), Red Hat/openshift4/ose-oauth-server-rhel9 (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Red Hat/openshift4/ose-oauth-server-rhel8generic*Not reported
Red Hat/openshift4/ose-oauth-server-rhel9generic*Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Red Hat/openshift4/ose-oauth-server-rhel8, Red Hat/openshift4/ose-oauth-server-rhel9.
  2. 2Review the reported fix. Source-reported workaround: Until an OpenShift update containing the vendor fix is available, place an external WAF or load balancer that terminates TLS in front of the OAuth endpoint. Configure it to reject requests with an Accept-Language header larger than 4 KiB or with more than 32 combined - and _ separators. Rate-limit unauthenticated requests to the OAuth login and error endpoints as an additional defense. The proxy must re-establish TLS to the existing OAuth route, preserve the OAuth hostname/SNI, and validate the backend certificate. Do not disable TLS verification or expose the OAuth service directly. If an external TLS-terminating control cannot be deployed, there is no supported OpenShift router-only mitigation while the OAuth route remains TLS passthrough. Restricting access to the OAuth endpoint to trusted networks can reduce exposure but may affect user access. Upgrade to the first OpenShift release containing the fix as soon as it is available.

Evidence timeline and material changes

  1. Published upstream

    Sep 1, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 15, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Sep 1, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
Upstream source description

A flaw was found in openshift/oauth-server. The OAuth login and error page endpoints pass the unauthenticated Accept-Language header to golang.org/x/text/language.ParseAcceptLanguage() without input validation. A bypass of the CVE-2022-32149 mitigation exists: the upstream guard counts only '-' characters but the internal BCP 47 scanner aliases '_' to '-' after the guard check. An unauthenticated attacker can send a crafted Accept-Language header using '_' separators to trigger quadratic-time parsing, consuming excessive CPU and denying authentication to all cluster users.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • IBM i is Affected By An Improper Privilege Management VulnerabilitySame generic ecosystem
  • IBM i is Affected by a Denial of Service in Digital Certificate ManagerSame generic ecosystem
  • IBM Db2 Genius Hub Improper verification of cryptographic signatureSame generic ecosystem
  • WIMOOR through commit ec86736 Authentication Bypass via Forged X-USERINFO HeaderSame generic ecosystem
  • DataBuff ai-apm-web through 0.1.10 Authentication Bypass via Hardcoded HMAC SecretSame generic ecosystem
  • DataBuff ai-apm-web through 0.1.10 Hard-Coded Default Admin CredentialsSame generic ecosystem

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-407
Source
CVE List V5
Source checked
Oct 16, 2026
References
7 linked sources
Open source record