CVE-2025-49844 | Redis Lua Use-After-Free may lead to remote code execution

Redis is an open source, in-memory database that persists on disk. Versions 8.2.1 and below allow an authenticated user to use a specially crafted Lua script to manipulate the garbage collector, trigger a use-after-free and potentially lead to remote code execution. The problem exists in all versions of Redis with Lua scripting. This issue is fixed in version 8.2.2. To workaround this issue without patching the redis-server executable is to prevent users from executing Lua scripts. This can be done using ACL to restrict EVAL and EVALSHA commands.

Published: 2025-10-03 Last update: 2026-03-20 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-49844 is rated High Risk (75/100): CVSS Critical severity, with high exploitation likelihood (EPSS 11.11%, 94th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +2.61% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2025-49844

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-21 8.50% 11.11% +2.61%
2 2026-04-27 14.17% 8.50% -5.67%
3 2026-04-10 — 14.17% —

Full EPSS history (27 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-49844

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.9 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.1 6.0 [email protected]
9.9 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.1 6.0 [email protected]

Weakness enumeration for CVE-2025-49844

OS Trackers for CVE-2025-49844

vendor priority summary link
alpine — CVE-2025-49844: 3 source package rows (redict, redis, valkey); 104 state rows across 8 repos (3.19-main, 3.20-main, 3.21-main, 3.22-community, 3.22-main, 3.23-community, edge-community, edge-main); fixed 19, open 85. https://security.alpinelinux.org/vuln/CVE-2025-49844
debian not yet assigned CVE-2025-49844 not yet assigned priority: Debian including 3 source packages (redict, redis, valkey), 10 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 10. https://security-tracker.debian.org/tracker/CVE-2025-49844
redhat high — https://access.redhat.com/security/cve/CVE-2025-49844
suse critical CVE-2025-49844 severity critical: SUSE including 33 source package names (8.0.6-2.44:valkey-8.0.6-150600.13.17.1, docker-27.5.1_ce-slfo.1.1_2.1, …), 113 product×package rows across 51 product lines (Container private-registry/harbor-valkey, Image SL-Micro-Azure, … (51 product lines)): Fixed 104, Known Not Affected 6, First Fixed 3. https://www.suse.com/security/cve/CVE-2025-49844/
ubuntu high CVE-2025-49844 high priority: Ubuntu including 8 source packages (lua5.1, lua5.2, …), 53 status rows across 9 suites (bionic, focal, jammy, noble, plucky, questing, trusty, upstream, xenial): not-affected 18, released 14, needed 8, needs-triage 7, DNE 6. https://ubuntu.com/security/CVE-2025-49844

Affected software / configurations for CVE-2025-49844

Vendor Product Version Raw CPE
redis redis < 6.2.20 cpe:2.3:a:redis:redis:*:*:*:*:*:*:*:*
redis redis >= 7.0, < 7.2.11 cpe:2.3:a:redis:redis:*:*:*:*:*:*:*:*
redis redis >= 7.4.0, < 7.4.6 cpe:2.3:a:redis:redis:*:*:*:*:*:*:*:*
redis redis >= 8.0.0, < 8.0.4 cpe:2.3:a:redis:redis:*:*:*:*:*:*:*:*
redis redis >= 8.2.0, < 8.2.2 cpe:2.3:a:redis:redis:*:*:*:*:*:*:*:*
lfprojects valkey < 7.2.11 cpe:2.3:a:lfprojects:valkey:*:*:*:*:*:*:*:*
lfprojects valkey >= 8.0.0, < 8.0.6 cpe:2.3:a:lfprojects:valkey:*:*:*:*:*:*:*:*
lfprojects valkey >= 8.1.0, < 8.1.4 cpe:2.3:a:lfprojects:valkey:*:*:*:*:*:*:*:*

References for CVE-2025-49844

cvelogic Threat Intelligence