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Redis EUVDEUVD-2026-27410

| CVE-2026-25243 HIGH
Heap-based Buffer Overflow (CWE-122)
2026-05-05 security-advisories@github.com
7.7
CVSS 4.0 · Vendor: github
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Severity by source

Vendor (github) PRIMARY
7.7 HIGH
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
SUSE
8.8 HIGH
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Red Hat
8.8 HIGH
qualitative

Primary rating from Vendor (github).

CVSS VectorVendor: github

CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

3
Patch available
May 05, 2026 - 19:01 EUVD
Source Code Evidence Fetched
May 05, 2026 - 17:31 vuln.today
Analysis Generated
May 05, 2026 - 17:31 vuln.today

DescriptionCVE.org

Redis is an in-memory data structure store. In versions of redis-server up to 8.6.3, the RESTORE command does not properly validate serialized values. An authenticated attacker with permission to execute RESTORE can supply a crafted serialized payload that triggers invalid memory access and may lead to remote code execution. A workaround is to restrict access to the RESTORE command with ACL rules. This is patched in version 8.6.3.

AnalysisAI

Remote code execution in Redis server versions up to 8.6.3 allows authenticated attackers with RESTORE command privileges to execute arbitrary code by submitting maliciously crafted serialized payloads. The vulnerability stems from insufficient validation of serialized values in the RESTORE command, enabling heap-based buffer overflow conditions. Redis released version 8.6.3 to patch this flaw alongside four other critical RCE vulnerabilities. EPSS data not available; no CISA KEV listing identified at time of analysis, suggesting targeted rather than widespread exploitation.

Technical ContextAI

Redis RESTORE command deserializes Redis Database (RDB) format payloads to reconstruct data structures in memory. The vulnerability is a heap-based buffer overflow (CWE-122) occurring during deserialization when the server fails to properly validate bounds and structure of the serialized input. This affects the core redis-server binary in versions prior to 8.6.3. The RDB format includes length prefixes and type encodings; improper validation of these fields during reconstruction can cause the server to write beyond allocated heap boundaries. Since Redis typically runs with privileges to access all stored data and often executes as a service account, successful exploitation grants code execution in the context of the Redis process, potentially allowing attackers to pivot to the underlying operating system or exfiltrate all cached data.

RemediationAI

Upgrade to Redis version 8.6.3 immediately, available at https://github.com/redis/redis/releases/tag/8.6.3. This release addresses five distinct RCE vulnerabilities including CVE-2026-25243. For environments where immediate patching is not feasible, implement ACL restrictions to block RESTORE command access for untrusted users using the command 'ACL SETUSER <username> -restore' to deny RESTORE permissions. This workaround reduces attack surface but does not eliminate risk if an attacker compromises a privileged account. Additional compensating controls include network segmentation to restrict Redis access to trusted application servers only (not internet-facing), enforcing authentication with strong passwords via requirepass directive, and enabling TLS for client connections to prevent credential interception. Note that disabling RESTORE affects legitimate backup/restore workflows and replication scenarios that depend on this command, requiring alternative data migration strategies. Monitor Redis logs for unexpected RESTORE command usage from unfamiliar source IPs as a detection measure.

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Vendor StatusVendor

SUSE

Severity: High
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Affected

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EUVD-2026-27410 vulnerability details – vuln.today

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