CVE-2026-27623

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 72% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
EPSS PROB
0.7%
EPSS %ILE
49th
KEV
Not listed

Published

February 23, 2026

Last Modified

July 15, 2026

Advisory Details (4)

Auto-updated Jul 1, 2026
Patch available. Sources: github, redhat.
redhat

Affected: Red Hat Enterprise Linux 10",

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27623.json
redhatMentions a patch (unverified)

2442021 – (CVE-2026-27623) CVE-2026-27623 Valkey: Valkey: Denial of Service via specially crafted network requests

https://bugzilla.redhat.com/show_bug.cgi?id=2442021
redhatMentions a patch (unverified)

cve-details

https://access.redhat.com/security/cve/CVE-2026-27623
githubMentions a patch (unverified)

Pre-Authentication DOS from malformed RESP request · Advisory · valkey-io/valkey · GitHub

https://github.com/valkey-io/valkey/security/advisories/GHSA-93p9-5vc7-8wgr

Vendor Advisories for CVE-2026-27623(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(2 across 2 ecosystems)
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
valkey—
  • 9.0.0 up to 9.0.3-r0: fixed in 9.0.3-r0
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
valkey—
  • 9.0.0 up to 9.0.3-r0: fixed in 9.0.3-r0
—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 25× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 122 total refreshes for this CVE.

  1. 2026-10-10 20:00 UTCEPSS rescore
  2. 2026-10-09 20:07 UTCEPSS rescore
  3. 2026-10-09 07:55 UTCOSV refresh
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  1. 2026-09-10 09:34 UTCEPSS rescore
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  10. 2026-08-31 18:34 UTCOSV refresh
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  26. 2026-08-14 09:12 UTCEG score recompute
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  40. 2026-08-06 03:11 UTCEG score recompute
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  44. 2026-08-03 10:36 UTCEPSS rescore
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  70. 2026-07-18 06:59 UTCOSV refresh
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  73. 2026-07-15 16:57 UTCEPSS rescore
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  75. 2026-07-15 02:00 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-27623?
CVE-2026-27623 is a high vulnerability published on February 23, 2026. 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…
When was CVE-2026-27623 disclosed?
CVE-2026-27623 was first published on February 23, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-27623 actively exploited?
CVE-2026-27623 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (49th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-27623?
CVE-2026-27623 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-27623?
A fix for CVE-2026-27623 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-27623 are linked in the Vendor Advisories panel on this page.

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