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TI-2026-18912 Aliases CVE-2026-23479

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

Priority MEDIUM 41CWE-416Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
High
Attack requirements
None
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.02612 85th percentileScored 2026-11-07
Fix Fixed redis (redis): 8.6.3Red Hat: 7 advisories

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Redisredis7.2.0 to before 8.6.38.6.3Patch availableCNA
  • redis VendorRedis Affected 7.2.0 to before 8.6.3 Fixed in 8.6.3 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:redis:redis:*:*:*:*:*:*:*:*7.2.0 to before 8.6.3VulnerableRedis
  • cpe:2.3:a:redis:redis:*:*:*:*:*:*:*:* Versions 7.2.0 to before 8.6.3 Vulnerable ·Redis

Remediation

  • Fix · CNA redis (redis) Fixed in 8.6.3

Red Hat 7 advisories

  • RHSA-2026:26540 Released 2026-06-17 · Red Hat rating Important
    valkey security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) valkey-8.0.9-1.el10_0, valkey-devel-8.0.9-1.el10_0
  • RHSA-2026:26306 Released 2026-06-16 · Red Hat rating Important
    redis:7 security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) redis-7.2.14-1.module+el9.6.0+24344+1bc33ec7.aarch64::redis:7, redis-7.2.14-1.module+el9.6.0+24344+1bc33ec7.ppc64le::redis:7, redis-7.2.14-1.module+el9.6.0+24344+1bc33ec7.s390x::redis:7 +7
  • RHSA-2026:25925 Released 2026-06-15 · Red Hat rating Important
    valkey security update
    • Red Hat Enterprise Linux AppStream (v. 9) valkey-8.0.9-1.el9_8, valkey-devel-8.0.9-1.el9_8
Show 4 more Red Hat advisories
  • RHSA-2026:25219 Released 2026-06-11 · Red Hat rating Important
    redis:7 security update
    • Red Hat Enterprise Linux AppStream (v. 9) redis-7.2.14-1.module+el9.8.0+24327+41ceb644.aarch64::redis:7, redis-7.2.14-1.module+el9.8.0+24327+41ceb644.ppc64le::redis:7, redis-7.2.14-1.module+el9.8.0+24327+41ceb644.s390x::redis:7 +7
  • RHSA-2026:25216 Released 2026-06-11 · Red Hat rating Important
    valkey security update
    • Red Hat Enterprise Linux AppStream (v. 10) valkey-8.0.9-1.el10_2, valkey-devel-8.0.9-1.el10_2
  • RHSA-2026:14316 Released 2026-05-06 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images valkey-9.0.4-0.1.hum1@aarch64, valkey-9.0.4-0.1.hum1@src, valkey-9.0.4-0.1.hum1@x86_64 +10
  • RHSA-2026:7662 Released 2026-04-11 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images boost-1.90.0-7.hum1@aarch64, boost-1.90.0-7.hum1@src, boost-1.90.0-7.hum1@x86_64 +47

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:25216
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:25219, RHSA-2026:25925
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:26540
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:26306
Red Hat Hardened ImagesFixed RHSA-2026:14316, RHSA-2026:7662
Not affected: 2 products
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-23479
  2. 2026-10-28 Priority changed: LOW → MEDIUM

References

Advisory 1

Other 1

  • TI-2022-00463 Missing authorization in Debian redis KEVCVSS 3.1CRITICAL 10.0
  • TI-2025-31759 Redis Lua Use-After-Free may lead to remote code execution CVSS 3.1CRITICAL 10.0
  • TI-2023-18618 Heap overflow in COMMAND GETKEYS and ACL evaluation in Redis CVSS 3.1HIGH 8.8
  • TI-2024-20813 Lua library commands may lead to stack overflow and RCE in Redis CVSS 3.1HIGH 8.8
  • TI-2022-08647 Heap overflow issue with the Lua cjson library used by Redis CVSS 3.1HIGH 8.8
  • TI-2022-08549 Lua scripts can be manipulated to overcome ACL rules in Redis CVSS 3.1HIGH 7.8
See all 45 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences