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Fencer Vulns
high 7.5

CVE-2026-27623 json

Valkey has Pre-Authentication DOS from malformed RESP request

published 2026-02-23 8 mo ago modified 2026-09-08 2 mo ago also BIT-valkey-2026-27623 , EUVD-2026-7509 , GHSA-93p9-5vc7-8wgr

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 35%
public exploits
0
none known

Summary

Valkey is a distributed key-value database. Starting in version 9.0.0 and prior to version 9.0.3, a malicious actor with network access to Valkey can cause the system to abort by triggering an assertion. When processing incoming requests, the Valkey system does not properly reset the networking state after processing an empty request. A malicious actor can then send a request that the server incorrectly identifies as breaking server side invariants, which results in the server shutting down. Version 9.0.3 fixes the issue. As an additional mitigation, properly isolate Valkey deployments so that only trusted users have access.

Patch / fix

  • bitnami valkey 9.0.3
  • lfprojects valkey 9.0.3
  • linuxfoundation valkey 9.0.3
  • valkey-io valkey 9.0.3
  • valkey openSUSE Tumbleweed 9.0.3-1.1

opensuse advisories openSUSE-SU-2026:10266-1

  • valkey Alpine 3.24, Alpine 3.23 9.0.3-r0

alpine advisories ALPINE-CVE-2026-27623

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-27623 updated cvss 7.5

Valkey: Valkey: Denial of Service via specially crafted network requests

  • Red Hat Enterprise Linux 9 valkey Red Hat Enterprise Linux 10 valkey
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
8 mo ago

Exploit prediction

0.40% chance of exploitation in the next 30 days, higher than 35% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
bitnami valkey
>=9.0.0, <9.0.3
9.0.3

Affected products

  • valkey-io valkey
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 9

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.