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CVE-2026-31838

Istio is an open platform to connect, manage, and secure microservices. Prior to 1.29.1, 1.28.5, and 1.27.8, a vulnerability in Envoy RBAC header matching could allow authorization policy bypass when policies rely on HTTP headers that may contain multiple values. An attacker could craft requests with multiple header values in a way that causes Envoy to evaluate the header differently than intended, potentially bypassing authorization checks. This may allow unauthorized requests to reach protecte
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:be1c3a8a163659146b462b7ce42e1348a5fde6d1b3adcb7b4739648e8a64f199
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"istio","vendor":"istio","versions":[{"status":"affected","version":">= 1.29.0-alpha.0, < 1.29.1"},{"status":"affected","version":">= 1.28.0-alpha.0, < 1.28.5"},{"status":"affected","version":"< 1.27.8"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8df6cc5ed283d37b595543979ddb81bd2527fa32dfe52e8ca3407f8035d23a96 · sha256:9b60638b0bfbb7cb… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":6.9,"baseSeverity":"MEDIUM","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:8df6cc5ed283d37b595543979ddb81bd2527fa32dfe52e8ca3407f8035d23a96 · sha256:9b60638b0bfbb7cb… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-863","description":"CWE-863: Incorrect Authorization","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:8df6cc5ed283d37b595543979ddb81bd2527fa32dfe52e8ca3407f8035d23a96 · sha256:9b60638b0bfbb7cb… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/istio/istio/commit/004fd6921314a8e2293fd195d91645dcbbff0aa1","tags":["x_refsource_MISC"],"url":"https://github.com/istio/istio/commit/004fd6921314a8e2293fd195d91645dcbbff0aa1"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8df6cc5ed283d37b595543979ddb81bd2527fa32dfe52e8ca3407f8035d23a96 · sha256:9b60638b0bfbb7cb… · /containers/cna/references/1
{"name":"https://github.com/istio/istio/security/advisories/GHSA-974c-2wxh-g4ww","tags":["x_refsource_CONFIRM"],"url":"https://github.com/istio/istio/security/advisories/GHSA-974c-2wxh-g4ww"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8df6cc5ed283d37b595543979ddb81bd2527fa32dfe52e8ca3407f8035d23a96 · sha256:9b60638b0bfbb7cb… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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