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Public proof of conceptFix available

CVE-2026-23479

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 redis-server from 7.2.0 until 8.6.3, the unblock client flow does not handle an error return from `processCommandAndResetClient` when re-executing a blocked command. If a blocked client is evicted during this flow, an authenticated attacker can trigger a use-after-free that may lead to remote code execution. This has been 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-2026-23479?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-23479?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≥ 7.2.0, < 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-2026-23479 Red Hat Product Security95 products fixed

    redis: use-after-free in unblock client flow may allow remote code execution

  • 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

  • RHSA-2026:25216 Red Hat Product Security17 products fixed

    Red Hat Security Advisory: valkey 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-2026:26540 · 17 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-2026:26540 · 17 productsRed Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.

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
4 repositories, unverifiedpduggusa/redis-cve-2026-23479-checkv1c0mmrt/redis-cve-2026-23479-scannerrizlmaulanaa/CVE-2026-23479-Redis-UAF-Proof-of-ConceptHackSpeak/CVE-2026-23479
PoC-in-GitHub

Sources

Technical details

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

Frequently asked questions

What is CVE-2026-23479?

Redis is an in-memory data structure store. In redis-server from 7.2.0 until 8.6.3, the unblock client flow does not handle an error return from `processCommandAndResetClient` when re-executing a blocked command. If a blocked client is evicted during this flow, an authenticated attacker can trigger a use-after-free that may lead to remote code execution. This has been patched in version 8.6.3.

Is CVE-2026-23479 actively exploited?

Active exploitation of CVE-2026-23479 has not been confirmed. Its EPSS score was 1.5% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-23479?

CVE-2026-23479 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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