Fix Redis Lua security vulnerabilities (CVE-2024-31449, CVE-2025-29844, CVE-2025-46817, CVE-2025-46819) #1022
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Fix lua UAF bug (CVE-2025-49844 - Redishell)
Fix lua bit.tohex (CVE-2024-31449)
KIMDONGYEON00
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KIMDONGYEON00
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CVE-2024-31449
Affected component/file:
lua_bit.cCVE-2024-31449 was found in Redis, and the same behavior is reproduced in Dragonfly.
A Lua stack overflow causes a crash.
According to the Redis security advisory, this vulnerability can lead to RCE attacks
CVE-2025-29844
Affected component/file:
lparser.cRedis versions 6.2.6 and below are vulnerable to remote code execution via a specially crafted Lua script that manipulates the garbage collector to trigger use-after-free.
Fixed in version 8.2.2. Workaround: Use ACL to restrict EVAL and EVALSHA commands.
According to the Redis security advisory, this vulnerability can lead use-after-free and potentially lead to remote code execution.
CVE-2025-46817
Affected component/file:
lbaselib.c,ltable.cRedis versions 8.2.1 and below are vulnerable to an integer overflow via a specially crafted Lua script that can corrupt Lua/VM state and potentially lead to remote code execution (RCE). Fixed in version 8.2.2. Workaround: Use ACL to restrict EVAL and EVALSHA (and related Lua/function execution) commands.
According to the Redis security advisory.
CVE-2025-46819
Affected component/file:
llex.cRedis versions 8.2.1 and below are vulnerable to a crafted Lua script that can trigger out-of-bounds reads or crash the server (DoS) by abusing the Lua lexer/long-string parsing; this may also lead to information disclosure depending on environment. Fixed in version 8.2.2.
According to the Redis security advisory.
They are strongly recommended to update to a safe Redis version.