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Exploitation reportedNot in CISA KEV yetFix available

CVE-2026-25243

redis-server RESTORE invalid memory access may allow remote code execution

Exploitation reported by one source. First attested on 2026-10-18 by GCVE · previdian.

  • Published2026-05-05
  • Fixed in8.6.3
  • WeaknessCWE-122

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 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.

Timeline

dates in UTC
  1. 2026-05-0517:17CVE publishedNVD
  2. 2026-10-1812:12Listed as exploited by GCVEGCVE
  3. 2026-10-1812:12Exploitation first reportedGCVE

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-2026-25243?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-25243?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
6.2< 6.2.226.2.22
redis
BranchAffectedFixed in
6.2< 6.2.226.2.22

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
  • redisAlmaLinux:8all versions · fixed in 6.2.22-1.module_el8.10.0+4197+3446deecand 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-2026-25243 Red Hat Product Security251 products fixed

    redis: RESTORE invalid memory access may allow remote code execution

  • RHSA-2026:33427 Red Hat Product Security16 products fixed

    Red Hat Security Advisory: redis:6 security update

  • RHSA-2026:29817 Red Hat Product Security12 products fixed

    Red Hat Security Advisory: redis:6 security update

  • RHSA-2026:28142 Red Hat Product Security18 products fixed

    Red Hat Security Advisory: redis:7 security update

  • RHSA-2026:28139 Red Hat Product Security21 products fixed

    Red Hat Security Advisory: redis security update

  • RHSA-2026:27787 Red Hat Product Security12 products fixed

    Red Hat Security Advisory: redis:6 security update

10 more advisories

Full record on NVD

Fix

  1. Update Redis to 8.6.3
  2. Vendor fix Red Hat Product Security RHSA-2026:33427 · 16 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-2026:33427 · 16 productsTo mitigate this flaw, restrict the execution privileges of the RESTORE command exclusively to highly trusted and administrative users by using the appropriate ACL rules.

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
3 repositories, unverifieddinosn/CVE-2026-25243dinosn/CVE-2026-25243-debugfreecaptain-woof/CVE-2026-25243
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 RESTORE invalid memory access may allow remote code execution

Frequently asked questions

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.

Is CVE-2026-25243 actively exploited?

Active exploitation of CVE-2026-25243 has not been confirmed. Its EPSS score was 3.7% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-25243?

CVE-2026-25243 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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