# CVE-2026-25243 — redis

> As of 2026-07-16, CVE-2026-25243 is a HIGH-severity vulnerability in redis, CVSS v3.1 8.8, EPSS 3.6% (89.3th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-25243, most recently “Redis Streams Shared-NACK Double-Free (CVE-2026-25243) & RedisBloom RESTORE/TDigest Heap Overflow (CVE-2026-25589) — Authenticated RCE, Public PoC, Patch Bypass”.

**Last updated:** 2026-07-16

## What is CVE-2026-25243?

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.

The record classifies CVE-2026-25243 under weakness class [CWE-122](https://intel.threadlinqs.com/cwe/CWE-122). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 158 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 8.8 — HIGH (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **CVSS v4.0 base score:** 7.7 (`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`)
- **EPSS (FIRST):** 3.6% probability of exploitation in the next 30 days, higher than 89.3% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 10/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-05-05, last modified 2026-07-16

## Is CVE-2026-25243 being exploited?

Weaponised exploit code for CVE-2026-25243 is publicly available. 3 public proof-of-concept repositories are tracked for this identifier. It currently carries a trending score of 35 in the Threadlinqs vulnerability feed.

- [dinosn/CVE-2026-25243](https://github.com/dinosn/CVE-2026-25243) (github)
- [dinosn/CVE-2026-25243-debugfree](https://github.com/dinosn/CVE-2026-25243-debugfree) (github)
- [captain-woof/CVE-2026-25243](https://github.com/captain-woof/CVE-2026-25243) (github)

## Affected products and versions

- [redis](https://intel.threadlinqs.com/vendors/redis): redis

## How to fix CVE-2026-25243

No vendor patch reference has been recorded for CVE-2026-25243 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-25243

1 tracked threat in the Threadlinqs corpus references CVE-2026-25243, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Redis Streams Shared-NACK Double-Free (CVE-2026-25243) & RedisBloom RESTORE/TDigest Heap Overflow (CVE-2026-25589) — Authenticated RCE, Public PoC, Patch Bypass](https://intel.threadlinqs.com/threat/TL-2026-1690) — HIGH · 2026-07-23

## Sources

Enriched from CVE.org, FIRST EPSS, public proof-of-concept repositories. Last verified by Threadlinqs on 2026-10-10.

**Vendor advisory and patch**

- [github.com](https://github.com/redis/redis/security/advisories/GHSA-c8h9-259x-jff4)

**Other references**

- [github.com](https://github.com/redis/redis/releases/tag/8.6.3)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-25243
Full detection coverage and IOCs for threats exploiting CVE-2026-25243 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp