CVE-2026-23479: redis Use After Free
Vulnerability summary
CVE-2026-23479 is a high (CVSS 8.8) Use After Free vulnerability in redis. EPSS estimates a 1.51% chance of exploitation in the next 30 days, higher than 73.9% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 10 · Related 4Timeline
- 05-05-2026PublishedVulnerability first disclosed.
- 16-07-2026Last modifiedVulnerability information updated.
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.
CVSS metrics
10 scores · 7 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated7.7HighCVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- OSV · ChainguardEcosystem advisory · calculated7.7HighCVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- NVDNIST7.7HighCVSS: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
- CVE.orgCNA7.5HighCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:HDiffers
- OSV · AlpineEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · Red hatEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:HDiffers
- OSV · UbuntuEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
1.51%
Chance of exploitation in the next 30 days
Percentile
74%
Versus all other CVEs
30-day change
+0.15 pp
From 1.36% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Redhat50 products
- boost< 0:1.90.0-7.hum1
- boost-atomic< 0:1.90.0-7.hum1
- boost-b2< 0:1.90.0-7.hum1
- boost-build< 0:1.90.0-7.hum1
- boost-charconv< 0:1.90.0-7.hum1
Chainguard7 products
- py3-redisAll versions (No fix recorded)
- py3.10-redisAll versions (No fix recorded)
- py3.11-redisAll versions (No fix recorded)
- py3.12-redisAll versions (No fix recorded)
- py3.13-redisAll versions (No fix recorded)
Debian3 products
- redictAll versions (No fix recorded)
- redis< 5:8.0.2-3+deb13u3 | < 5:8.0.6-3
- valkeyAll versions (No fix recorded) | < 9.1.1-1
Alpine1 product
- valkey< 7.2.13-r0 | < 8.1.7-r0 | < 9.0.4-r0
Redis1 product
- redis≥ 7.2.0, < 8.6.3
Ubuntu1 product
- redisAll versions (No fix recorded)
6 vendors · 63 products
References
21 links- github.com/redis/redis/security/advisories/GHSA-93m2-935m-8rj3X Refsource CONFIRMARTICLEAdvisoryVendor Advisory
Show all 21 references
- images.redhat.comARTICLE
