CVE-2025-49844: Redis is an open source, in-memory database that persists on disk

Q: How do I fix CVE-2025-49844?

redis: upgrade to 6.2.20, 7.2.11, 7.4.6, 8.0.4, 8.2.2; valkey: upgrade to 7.2.11, 8.0.6, 8.1.4. Exact commands for each OS are on this page.

Q: Is CVE-2025-49844 being exploited?

CVE-2025-49844 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-49844 affect?

CVE-2025-49844 affects redis, valkey. Severity is critical (CVSS 9.9). 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

Q: How urgent is CVE-2025-49844?

Priority 65/100. Critical severity; EPSS top 1%: very likely to be exploited; Public exploit reference

This week

CRITICAL 9.9UPGRADEUPGRADE

CVE-2025-49844 is a critical-severity flaw (CVSS 9.9) affecting redis, valkey. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 preve

Why this priority

Critical severity
EPSS top 1%: very likely to be exploited
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	9.9 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	82.6% (top 1%)
CISA exploited list	No
Weakness	CWE-416
Published	2025-10-03
Last modified	2026-10-19

Publisher (CNA): GitHub, Inc. · Vendor: lfprojects · redis

Last updated 2026-10-19 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-10-03 20:15 UTCPublished CVE record published
2026-10-19 16:10 UTCUpdated Record last modified

redis redis UPGRADE

Affected: < 6.2.20 · >= 7.0 and < 7.2.11 · >= 7.4.0 and < 7.4.6 · >= 8.0.0 and < 8.0.4 · >= 8.2.0 and < 8.2.2

Fixed in: 6.2.20, 7.2.11, 7.4.6, 8.0.4, 8.2.2

Safe to downgrade to: a release before 7.0

1. Check installed version

apt-cache policy redis || rpm -q redis || redis --version

2. UPGRADE to 6.2.20 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade redis

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade redis

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 7.0 (Debian / Ubuntu)

apt-cache madison redis sudo apt install redis=<VERSION_BEFORE_7.0> sudo apt-mark hold redis

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list redis sudo dnf downgrade redis-<VERSION_BEFORE_7.0> sudo dnf versionlock add redis

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

lfprojects valkey UPGRADE

Affected: < 7.2.11 · >= 8.0.0 and < 8.0.6 · >= 8.1.0 and < 8.1.4

Fixed in: 7.2.11, 8.0.6, 8.1.4

Safe to downgrade to: a release before 8.0.0

1. Check installed version

apt-cache policy valkey || rpm -q valkey || valkey --version

2. UPGRADE to 7.2.11 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade valkey

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade valkey

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 8.0.0 (Debian / Ubuntu)

apt-cache madison valkey sudo apt install valkey=<VERSION_BEFORE_8.0.0> sudo apt-mark hold valkey

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list valkey sudo dnf downgrade valkey-<VERSION_BEFORE_8.0.0> sudo dnf versionlock add valkey

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

Fedora 46 · wordpress · FIXED · 7.1.4-1.fc46 · FEDORA-2026-907394725e · source

sudo dnf upgrade --advisory=FEDORA-2026-907394725e

Fedora ELN · rhc · FIXED · 0.3.15-1.eln159 · FEDORA-2026-1cd9f35750 · source

sudo dnf upgrade --advisory=FEDORA-2026-1cd9f35750

Debian 12 · redis · FIXED · 5:7.0.15-1~deb12u6

sudo apt update && sudo apt install --only-upgrade redis dpkg --compare-versions "$(dpkg-query -W -f='${Version}' redis)" ge "5:7.0.15-1~deb12u6" && echo PATCHED || echo STILL-VULNERABLE

Debian 13 · redis · FIXED · 5:8.0.2-3+deb13u1

sudo apt update && sudo apt install --only-upgrade redis dpkg --compare-versions "$(dpkg-query -W -f='${Version}' redis)" ge "5:8.0.2-3+deb13u1" && echo PATCHED || echo STILL-VULNERABLE

Debian 13 · valkey · FIXED · 8.1.1+dfsg1-3+deb13u1

sudo apt update && sudo apt install --only-upgrade valkey dpkg --compare-versions "$(dpkg-query -W -f='${Version}' valkey)" ge "8.1.1+dfsg1-3+deb13u1" && echo PATCHED || echo STILL-VULNERABLE

RHEL 10 · valkey · FIXED · valkey-8.0.6-1.el10_0

sudo dnf upgrade --advisory=RHSA-2025:19675 rpm -q valkey

RHEL 9 · redis · FIXED · redis-6.2.20-1.el9_6

sudo dnf upgrade --advisory=RHSA-2025:19237 rpm -q redis

RHEL 9 · valkey · FIXED · valkey-8.0.6-2.el9_7

sudo dnf upgrade --advisory=RHSA-2025:21916 rpm -q valkey

RHEL 9.0 Update Services for SAP Solutions · redis · FIXED · redis-6.2.6-1.el9_0.5

sudo dnf upgrade --advisory=RHSA-2025:18997 rpm -q redis

RHEL 9.2 Update Services for SAP Solutions · redis · FIXED · redis-6.2.7-1.el9_2.5

sudo dnf upgrade --advisory=RHSA-2025:19086 rpm -q redis

Alpine 3.20 · valkey · FIXED · valkey-7.2.11-r0

apk add --upgrade valkey apk info -v valkey

Alpine 3.21 · valkey · FIXED · valkey-7.2.11-r0

apk add --upgrade valkey apk info -v valkey

Alpine 3.21 · redis · FIXED · redis-7.2.11-r0

apk add --upgrade redis apk info -v redis

Alpine 3.22 · valkey · FIXED · valkey-8.1.4-r0

apk add --upgrade valkey apk info -v valkey

Amazon Linux 2023 · see advisory · FIXED · ALAS2023-2025-1222 · source

sudo dnf update --advisory=ALAS2023-2025-1222

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: raminfp/redis_exploit (345 stars)
GitHub PoC: dwisiswant0/CVE-2025-49844 (67 stars)
GitHub PoC: saneki/cve-2025-49844 (26 stars)
Write-up: github.com/lastvocher/redis-CVE-2025-49844
GitHub PoC: Mufti22/CVE-2025-49844-RediShell-Vulnerability-Scanner
GitHub PoC: YuanBenSir/CVE-2025-49844_POC
Nuclei scan template: Redis Lua Parser < 8.2.2 - Use After Free

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-49844?

redis: upgrade to 6.2.20, 7.2.11, 7.4.6, 8.0.4, 8.2.2; valkey: upgrade to 7.2.11, 8.0.6, 8.1.4. Exact commands for each OS are on this page.

Is CVE-2025-49844 being exploited?

CVE-2025-49844 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-49844 affect?

CVE-2025-49844 affects redis, valkey. Severity is critical (CVSS 9.9). 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

How urgent is CVE-2025-49844?

Priority 65/100. Critical severity; EPSS top 1%: very likely to be exploited; Public exploit reference

Software pages

Redis vulnerabilities

Related CVEs

CVE-2025-46817 HIGH 7.0 UPGRADE Redis is an open source, in-memory database that persists on disk
CVE-2025-46819 MEDIUM 6.3 UPGRADE Redis is an open source, in-memory database that persists on disk
CVE-2025-46818 MEDIUM 6.0 UPGRADE Redis is an open source, in-memory database that persists on disk
CVE-2025-62507 HIGH 8.8 UPGRADE Redis is an open source, in-memory database that persists on disk
CVE-2026-25243 HIGH 8.8 UPGRADE Redis is an in-memory data structure store

References

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