CVE-2025-49844
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.
- CVSS
- 9.9Critical
- Exploited in the wild
- Not knownUnvetted proof-of-concept code on GitHub; not in CISA KEV
- EPSS
- 82.6%chance of exploitation in the next 30 daystop 0.4% of scored CVEsFIRST score of 11 Nov 2026
- Fix
- Patch availablesee the advisories in the references
- Published
- 3 Oct 2025analysed here 12 Nov 2026
Summary
Triage
The summary, impact and action text on this page are written by our AI analysis pipeline, or taken from the NVD description when a CVE was imported from NVD. They are not the vendor's wording: check them against the sources. A longer AI executive summary and technical analysis are generated for signed-in accounts on the Max plan.
Affected products
| Product | Affected versions | Vendor says fixed in |
|---|---|---|
| redis | < 8.2.2Vendor says fixed in: not stated |
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.
Products named in our analysis
- redis:redis
- lfprojects:valkey
Fix and mitigation
WAF and other mitigations
Can a WAF block it? No. This is a use-after-free memory bug. Generic WAF rules do not recognise the input that triggers it; only a rule written for this specific CVE can, and only if the triggering request has a recognisable shape.
Also consider: patch
Based on the weakness type only; no CVE-specific evidence yet. We check Cloudflare, AWS, Google Cloud Armor and Azure; for Akamai, Imperva, Fastly, F5, ask your vendor.
Remediation steps (AI-written)
Step-by-step remediation is generated for accounts on the Max plan, for CVEs that match a technology in their stack. Add this technology to your stack to see the fix checklist.
Exploitation evidence
- CISA KEV catalog
- Not listed as of our last sync.
- Public exploit code
- Unvetted proof-of-concept code on GitHub: 19 GitHub proofs of concept · 1 Nuclei template
- CISA SSVC
- exploitation poc, automatable no, technical impact totalAssessed by CISA 20 Mar 2026 (SSVC 2.0.3). Exploitation is none, poc (public proof of concept) or active.
Nuclei
- Redis Lua Parser < 8.2.2 - Use After Freedetection template, critical
GitHub proofs of concept
- raminfp/redis_exploit345 stars
- dwisiswant0/CVE-2025-4984467 stars
- saneki/cve-2025-4984426 stars
- lastvocher/redis-CVE-2025-4984414 stars
and 15 more repositories
Listed so you can judge urgency, not as a recommendation to run anything. GitHub “proofs of concept” are unvetted: some are fake or carry malware. Exploit-DB marks the entries its staff verified.
Timeline
- 3 Oct 2025Published
- 7 Oct 2025First proof-of-concept repository on GitHub (unvetted)3 days later
- 20 Mar 2026CISA SSVC assessment: exploitation poc164 days (about 5 months) later
- 20 Mar 2026CVE record last updatedsame day later
- 12 Nov 2026Analysed by vulneraibility.com237 days (about 8 months) later
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
| Metric | Value | What it means |
|---|---|---|
| Attack vector | NetworkReachable over the internet or any routable network. | Reachable over the internet or any routable network. |
| Attack complexity | LowRepeatable attack, no special conditions. | Repeatable attack, no special conditions. |
| Privileges required | LowThe attacker needs basic user privileges. | The attacker needs basic user privileges. |
| User interaction | NoneNo victim action needed. | No victim action needed. |
| Scope | ChangedImpact crosses a security boundary into other components. | Impact crosses a security boundary into other components. |
| Confidentiality | HighTotal data disclosure possible. | Total data disclosure possible. |
| Integrity | HighComplete modification possible. | Complete modification possible. |
| Availability | HighFull outage possible. | Full outage possible. |
Common questions
Is CVE-2025-49844 being exploited?
Not confirmed. CVE-2025-49844 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 83% probability of exploitation in the next 30 days.
How severe is CVE-2025-49844?
CVE-2025-49844 is rated Critical with a CVSS score of 9.9. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2025-49844?
Yes. A fix has been recorded for CVE-2025-49844. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2025-49844 affect?
CVE-2025-49844 affects redis:redis, lfprojects:valkey. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
References
5 references in the CVE record, grouped by the tags the record gives them.
Exploits (1)
- github.com /lastvocher/redis-CVE-2025-49844
Other links (4)
- github.com /redis/redis/security/advisories/GHSA-4789-qfc9-5f9q
- github.com /redis/redis/commit/d5728cb5795c966c5b5b1e0f0ac576a7e69af539
- github.com /redis/redis/releases/tag/8.2.2
- openwall.com /lists/oss-security/2025/10/07/2
Where the data on this page comes from
- CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
- NVD: CVSS and CPE data
- CISA Vulnrichment (ADP): SSVC decision points
- FIRST EPSS: exploit probability and percentile
- Nuclei templates: detection templates
- PoC-in-GitHub: GitHub repositories that claim a proof of concept
Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.
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