CVE-2026-39350

mediumpriority · track · 0OT risk · elevatedEPSS 0.002 · 11 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.21% (11th) EPSS

CVSS 5.4 · medium

Is it mine?

7 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · osv · nvd

EPSS · scored 2026-10-27

Istio is an open platform to connect, manage, and secure microservices. In versions 1.25.0 through 1.27.8, 1.28.0 through 1.28.5, 1.29.0, and 1.29.1, the serviceAccounts and notServiceAccounts fields in AuthorizationPolicy incorrectly interpret dots (.) as a regular expression matcher. Because . is a valid character in a service account name, an AuthorizationPolicy ALLOW rule targeting a service account such as cert-manager.io also matches cert-manager-io, cert-managerXio, etc. A DENY rule targeting the same name fails to block those variants. Fixes are available in versions 1.29.2, 1.28.6, and 1.27.9.

cvss

Technical severity, 0–10. One row per scoring source.

5.4

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.15.4mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:Nsecondary · ENISA EU

v3.15.4mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:Nsecondary · security-advisories@github.comexploitability 2.8 · impact 2.5

v3.15.4mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:Nsecondary · OSV

v3.15mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-185USCWE-185USCWE-863US

affected products (7)

Products and version ranges known to be affected.

istio istio1.25.0, → < 1.27.9enisa_euvdEU
istio istio1.28.0, → 1.28.6enisa_euvdEU
istio istio1.29.0, → 1.29.2enisa_euvdEU
istio istio1.25.0 → 1.27.9nvdUScpe:2.3:a:istio:istio:*:*:*:*:*:*:*:*
istio istio1.28.0 → 1.28.6nvdUScpe:2.3:a:istio:istio:*:*:*:*:*:*:*:*
istio istio1.29.0 → 1.29.2nvdUScpe:2.3:a:istio:istio:*:*:*:*:*:*:*:*
Go istio.io/istio0.0.0-20241024090207-0bf27d49ba4b → 0.0.0-20260403004500-692e460c342dosvUSpkg:golang/istio.io/istio

advisories (2)

Vendor and ecosystem advisories describing this.

GHSA-9gcg-w975-3rjhIstio: AuthorizationPolicy serviceAccounts regex injection via unescaped dots2026-04-16ghsa · osvUS
### Impact The `serviceAccounts` and `notServiceAccounts` fields in AuthorizationPolicy incorrectly interpret dots (`.`) as a regular expression matcher. Because `.` is a valid character in a service account name, an `AuthorizationPolicy` ALLOW rule targeting SA e.g. `cert-manager.io` also matches `cert-manager-io`, `cert-managerXio`, etc. A DENY rule targeting the same name fails to block those variants. ### Patches Fixes are available in 1.29.2, 1.28.6, and 1.27.9 ### Workarounds None
GO-2026-5289Istio: AuthorizationPolicy serviceAccounts regex injection via unescaped dots in istio.io/istio2026-06-25vendor · osvUS
Istio: AuthorizationPolicy serviceAccounts regex injection via unescaped dots in istio.io/istio

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd osv nvd NVD CVE.org MITRE

published 2026-04-15modified 2026-06-17

references (5)

External citations — patches, advisories, analysis.

scry

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