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Fix incomplete affected functions for RUSTSEC-2026-0041 #2724

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Fix incomplete affected functions for RUSTSEC-2026-0041 #2724

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15 changes: 11 additions & 4 deletions crates/lz4_flex/RUSTSEC-2026-0041.md
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,14 @@ cvss = "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"
[affected.functions]
"lz4_flex::block::decompress_into" = ["<= 0.11.5", "= 0.12.0"]
"lz4_flex::block::decompress_into_with_dict" = ["<= 0.11.5", "= 0.12.0"]
"lz4_flex::block::decompress" = ["<= 0.11.5", "= 0.12.0"]
"lz4_flex::block::decompress_with_dict" = ["<= 0.11.5", "= 0.12.0"]
"lz4_flex::block::decompress_size_prepended" = ["<= 0.11.5", "= 0.12.0"]
"lz4_flex::block::decompress_size_prepended_with_dict" = ["<= 0.11.5", "= 0.12.0"]
# Deprecated re-exports
"lz4_flex::decompress" = ["<= 0.11.5", "= 0.12.0"]
"lz4_flex::decompress_into" = ["<= 0.11.5", "= 0.12.0"]
"lz4_flex::decompress_size_prepended" = ["<= 0.11.5", "= 0.12.0"]
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@Marcono1234 Marcono1234 Mar 17, 2026 •
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I hope I did not overlook something here. If possible please double-check.


[versions]
patched = [">= 0.11.6, < 0.12.0", ">= 0.12.1"]
Expand All @@ -28,13 +36,12 @@ the initialized portion of the output buffer.

Two scenarios are affected:

- Decompressing with the `unsafe` implementation (`safe-decode` feature flag disabled, which
is the default): can leak content of uninitialized memory as part of the decompressed result.
- Decompressing with the `unsafe` implementation (`safe-decode` feature flag disabled; flag is
enabled by default): can leak content of uninitialized memory as part of the decompressed result.
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@Marcono1234 Marcono1234 Mar 17, 2026 •
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Reworded this to make it (hopefully) clearer; "which is the default" might have been ambiguous, e.g. whether it means "the flag is enabled by default" or "the flag being disabled is the default".

I hope that is ok.

- Decompressing into a reused, user-supplied output buffer (also affects `safe-decode`): can
leak the previous contents of the output buffer as part of the decompressed result.

Only the block-based API is affected: `lz4_flex::block::decompress_into` and
`lz4_flex::block::decompress_into_with_dict`. All frame APIs are unaffected.
Only the block-based API is affected. All frame APIs are unaffected.

The flaw was corrected in versions 0.11.6 and 0.12.1 by properly validating offset values
during decompression.
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