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Sparse files in tar archives contain only the non-zero components of the file. There are several different encodings for sparse files. When reading GNU tar pax 1.0 sparse files, archive/tar did not set a limit on the size of the sparse region data. A malicious archive containing a large number of sparse blocks could cause archive/tar to read an unbounded amount of data from the archive into memory. Since a malicious input can be highly compressable, a small compressed input could cause very large allocations. Cap the size of the sparse block data to the same limit used for PAX headers (1 MiB). Thanks to Harshit Gupta (Mr HAX) (https://www.linkedin.com/in/iam-harshit-gupta/) for reporting this issue. Fixes CVE-2025-58183 For #75677 Fixes #75711 Change-Id: I70b907b584a7b8676df8a149a1db728ae681a770 Reviewed-on: https://go-internal-review.googlesource.com/c/go/+/2800 Reviewed-by: Roland Shoemaker <bracewell@google.com> Reviewed-by: Nicholas Husin <husin@google.com> Reviewed-on: https://go-internal-review.googlesource.com/c/go/+/2987 Reviewed-by: Damien Neil <dneil@google.com> Reviewed-on: https://go-review.googlesource.com/c/go/+/709852 TryBot-Bypass: Michael Pratt <mpratt@google.com> Reviewed-by: Carlos Amedee <carlos@golang.org> Auto-Submit: Michael Pratt <mpratt@google.com> This is a port of upstream commit 2612dcfd3cb6dd73c76e14a24fe1a68e2708e4e3 , "Copyright 2009 The Go Authors." Signed-off-by: Miloslav Trmač <mitr@redhat.com>
vbatts
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Oct 14, 2025
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= an unbounded resource consumption when reading an untrusted archive.
Just a direct copy of golang/go@2612dcf , “Copyright 2009 The Go Authors.” Hopefully the copyright lines in individual Go lines are sufficient to satisfy the license — at least that seems consistent with previous practice in this repo.