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CVE Vulnerabilities

CVE-2026-25243

Heap-based Buffer Overflow

Published: May 05, 2026 | Modified: Jun 30, 2026
CVSS 3.x
8.8
HIGH
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 2.x
RedHat/V2
RedHat/V3
8.8 IMPORTANT
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Ubuntu
MEDIUM
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2026-25243
CWEhttps://cwe.mitre.org/data/definitions/122.html

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.

Weakness

A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

Affected Software

NameVendorStart VersionEnd Version
RedisRedis*8.6.3 (excluding)
Red Hat Enterprise Linux 10RedHatvalkey-0:8.0.9-1.el10_2*
Red Hat Enterprise Linux 10.0 Extended Update SupportRedHatvalkey-0:8.0.9-1.el10_0*
Red Hat Enterprise Linux 8RedHatredis:6-8100020260522105353.489197e6*
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRedHatredis:6-8040020260618162855.522a0ee4*
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnRedHatredis:6-8040020260618162855.522a0ee4*
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRedHatredis:6-8060020260623095617.ad008a3a*
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-OnRedHatredis:6-8060020260623095617.ad008a3a*
Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceRedHatredis:6-8080020260626132343.63b34585*
Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRedHatredis:6-8080020260626132343.63b34585*
Red Hat Enterprise Linux 9RedHatredis-0:6.2.22-1.el9_8*
Red Hat Enterprise Linux 9RedHatredis:7-9080020260521083756.9*
Red Hat Enterprise Linux 9RedHatvalkey-0:8.0.9-1.el9_8*
Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsRedHatredis-0:6.2.7-1.el9_2.6*
Red Hat Enterprise Linux 9.4 Update Services for SAP SolutionsRedHatredis-0:6.2.7-1.el9_4.6*
Red Hat Enterprise Linux 9.4 Update Services for SAP SolutionsRedHatredis:7-9040020260618054637.9*
Red Hat Enterprise Linux 9.6 Extended Update SupportRedHatredis-0:6.2.22-1.el9_6*
Red Hat Enterprise Linux 9.6 Extended Update SupportRedHatredis:7-9060020260602115714.9*
RedisUbuntuesm-apps/xenial*
RedisUbuntuquesting*

Potential Mitigations

  • Use automatic buffer overflow detection mechanisms that are offered by certain compilers or compiler extensions. Examples include: the Microsoft Visual Studio /GS flag, Fedora/Red Hat FORTIFY_SOURCE GCC flag, StackGuard, and ProPolice, which provide various mechanisms including canary-based detection and range/index checking.
  • D3-SFCV (Stack Frame Canary Validation) from D3FEND [REF-1334] discusses canary-based detection in detail.
  • Run or compile the software using features or extensions that randomly arrange the positions of a program’s executable and libraries in memory. Because this makes the addresses unpredictable, it can prevent an attacker from reliably jumping to exploitable code.
  • Examples include Address Space Layout Randomization (ASLR) [REF-58] [REF-60] and Position-Independent Executables (PIE) [REF-64]. Imported modules may be similarly realigned if their default memory addresses conflict with other modules, in a process known as “rebasing” (for Windows) and “prelinking” (for Linux) [REF-1332] using randomly generated addresses. ASLR for libraries cannot be used in conjunction with prelink since it would require relocating the libraries at run-time, defeating the whole purpose of prelinking.
  • For more information on these techniques see D3-SAOR (Segment Address Offset Randomization) from D3FEND [REF-1335].

References

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