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Public proof of conceptFix available

CVE-2026-23631

A public proof of concept exists; no exploitation attested.

  • Published2026-05-05
  • Fixed in8.6.3
  • WeaknessCWE-416

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Redis is an in-memory data structure store. In all versions of redis-server with Lua scripting, an authenticated attacker can exploit the master-replica synchronization mechanism to trigger a use-after-free on replicas where replica-read-only is disabled or can be disabled, which may lead to remote code execution. A workaround is to prevent users from executing Lua scripts or avoid using replicas where replica-read-only is disabled. This is patched in version 8.6.3.

Timeline

dates in UTC
  1. 2026-05-0517:17CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-23631?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-23631?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV
Redis
BranchAffectedFixed in
8.6< 8.6.38.6.3
keydb
BranchAffectedFixed in
7.2≥ 7.2.0, < 7.2.147.2.14
redis
BranchAffectedFixed in
7.2≥ 7.2.0, < 7.2.147.2.14

1 more product in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • redisAlmaLinux:9all versions · fixed in 7.2.14-1.module_el9.8.0+258+b8f945d3and 2 other packages
  • valkeyAlmaLinux:10all versions · fixed in 8.0.9-1.el10_2and 1 other package
  • valkeyAlmaLinux:9all versions · fixed in 8.0.9-1.el9_8and 1 other package

Vendor advisories

  • CVE-2026-23631 Red Hat Product Security118 products fixed · 4 known affected

    redis: Remote code execution via use-after-free in Lua scripting

    redis as a component of Red Hat Enterprise Linux 9 · redis-devel as a component of Red Hat Enterprise Linux 9 · redis-doc as a component of Red Hat Enterprise Linux 9 · +1 more

  • RHSA-2026:33444 Red Hat Product Security18 products fixed

    Red Hat Security Advisory: redis:7 security update

  • RHSA-2026:26540 Red Hat Product Security17 products fixed

    Red Hat Security Advisory: valkey security update

  • RHSA-2026:26306 Red Hat Product Security18 products fixed

    Red Hat Security Advisory: redis:7 security update

  • RHSA-2026:25925 Red Hat Product Security17 products fixed

    Red Hat Security Advisory: valkey security update

  • RHSA-2026:25219 Red Hat Product Security18 products fixed

    Red Hat Security Advisory: redis:7 security update

2 more advisories

Full record on NVD

Fix

  1. Update Redis to 8.6.3
  2. Vendor fix Red Hat Product Security RHSA-2026:33444 · 18 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
  3. Vendor fix Red Hat Product Security RHSA-2026:14316 · 13 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/
  4. Workaround from the vendor Red Hat Product Security RHSA-2026:33444 · 18 productsTo mitigate this flaw, ensure that Redis replicas maintain `replica-read-only` as enabled and prevent its modification by unauthorized users. If Lua scripting is not a required feature, consider disabling it to reduce the attack surface. Restricting network access to Redis instances to trusted clie…
  5. No fix available, says the vendor Red Hat Product Security CVE-2026-23631 · 4 productsAffected

Advisories and patches

Detection

read 2026-10-23 19:25 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
2 repositories, unverifiedyoyosh/DarkReplicaHORKimhab/CVE-2026-23631
PoC-in-GitHub

Sources

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
CVSS 4.0 vector
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:N/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
Published
2026-05-05
Last Modified
2026-07-25
NVD status
Modified
MSRC Title
redis-server Lua use-after-free may allow remote code execution

Frequently asked questions

What is CVE-2026-23631?

Redis is an in-memory data structure store. In all versions of redis-server with Lua scripting, an authenticated attacker can exploit the master-replica synchronization mechanism to trigger a use-after-free on replicas where replica-read-only is disabled or can be disabled, which may lead to remote code execution. A workaround is to prevent users from executing Lua scripts or avoid using replicas where replica-read-only is disabled. This is patched in version 8.6.3.

Is CVE-2026-23631 actively exploited?

Active exploitation of CVE-2026-23631 has not been confirmed. Its EPSS score was 2.8% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-23631?

CVE-2026-23631 has a CVSS v3 base score of 8.1 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H.

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