CVE-2026-40969: The raw message of every server-side AuthenticationException is returned to the unauthenticated remote caller

Q: How do I fix CVE-2026-40969?

spring grpc: upgrade to 1.0.3. Exact commands for each OS are on this page.

Q: Is CVE-2026-40969 being exploited?

CVE-2026-40969 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-40969 affect?

CVE-2026-40969 affects spring grpc. Severity is low (CVSS 3.7). The raw message of every server-side AuthenticationException is returned to the unauthenticated remote caller in the gRPC status description. This allows an attacker to obtain information about the authentication failure, which may be usefu

Q: How urgent is CVE-2026-40969?

Priority 20/100. Remotely exploitable, no login, no user action

Routine

LOW 3.7REMOTEUPGRADE

CVE-2026-40969 is a low-severity flaw (CVSS 3.7) affecting spring grpc. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The raw message of every server-side AuthenticationException is returned to the unauthenticated remote caller in the gRPC status description. This allows an attacker to obtain information about the authentication failure, which may be useful for further attacks. Affected versions: Spring gRPC: 1.0.0 - 1.0.2 (fixed in 1.0.3). Older, unsupported versions are also affected.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	3.7 (Low)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 90%)
CISA exploited list	No
Weakness	CWE-209
Published	2026-04-28
Last modified	2026-10-26

Publisher (CNA): VMware · Vendor: vmware

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-28 15:16 UTCPublished CVE record published
2026-10-26 00:10 UTCUpdated Record last modified

vmware spring grpc UPGRADE

Affected: < 1.0.3

Fixed in: 1.0.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy spring-grpc || rpm -q spring-grpc || spring-grpc --version

2. UPGRADE to 1.0.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade spring-grpc

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade spring-grpc

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-40969?

spring grpc: upgrade to 1.0.3. Exact commands for each OS are on this page.

Is CVE-2026-40969 being exploited?

CVE-2026-40969 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-40969 affect?

CVE-2026-40969 affects spring grpc. Severity is low (CVSS 3.7). The raw message of every server-side AuthenticationException is returned to the unauthenticated remote caller in the gRPC status description. This allows an attacker to obtain information about the authentication failure, which may be usefu

How urgent is CVE-2026-40969?

Priority 20/100. Remotely exploitable, no login, no user action

Software pages

VMware vulnerabilities

References

← Back to latest CVEs