Integer overflow in the index.c:read_entry() function while decompressing a compressed prefix length in libgit2 before v0.26.2 allows an attacker to cause a denial of service (out-of-bounds read) via a crafted repository index file.
The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.
| Link | Tags |
|---|---|
| https://github.com/libgit2/libgit2/commit/3207ddb0103543da8ad2139ec6539f590f9900c1 | third party advisory patch |
| https://libgit2.github.com/security/ | third party advisory patch |
| https://github.com/libgit2/libgit2/commit/3db1af1f370295ad5355b8f64b865a2a357bcac0 | third party advisory patch |
| https://lists.debian.org/debian-lts-announce/2022/03/msg00031.html | third party advisory mailing list |