62 lines
2.3 KiB
Diff
62 lines
2.3 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Stan Ulbrych <stan@python.org>
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Date: Mon, 13 Apr 2026 02:14:54 +0100
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Subject: 00482: CVE-2026-6100
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Fix a possible UAF in {LZMA,BZ2,_Zlib}Decompressor
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---
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.../Security/2026-04-10-16-28-21.gh-issue-148395.kfzm0G.rst | 5 +++++
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Modules/_bz2module.c | 1 +
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Modules/_lzmamodule.c | 1 +
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Modules/zlibmodule.c | 1 +
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4 files changed, 8 insertions(+)
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create mode 100644 Misc/NEWS.d/next/Security/2026-04-10-16-28-21.gh-issue-148395.kfzm0G.rst
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diff --git a/Misc/NEWS.d/next/Security/2026-04-10-16-28-21.gh-issue-148395.kfzm0G.rst b/Misc/NEWS.d/next/Security/2026-04-10-16-28-21.gh-issue-148395.kfzm0G.rst
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new file mode 100644
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index 0000000000..9502189ab1
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--- /dev/null
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+++ b/Misc/NEWS.d/next/Security/2026-04-10-16-28-21.gh-issue-148395.kfzm0G.rst
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@@ -0,0 +1,5 @@
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+Fix a dangling input pointer in :class:`lzma.LZMADecompressor`,
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+:class:`bz2.BZ2Decompressor`, and internal :class:`!zlib._ZlibDecompressor`
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+when memory allocation fails with :exc:`MemoryError`, which could let a
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+subsequent :meth:`!decompress` call read or write through a stale pointer to
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+the already-released caller buffer.
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diff --git a/Modules/_bz2module.c b/Modules/_bz2module.c
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index 97bd44b4ac..a732e89d55 100644
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--- a/Modules/_bz2module.c
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+++ b/Modules/_bz2module.c
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@@ -587,6 +587,7 @@ decompress(BZ2Decompressor *d, char *data, size_t len, Py_ssize_t max_length)
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return result;
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error:
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+ bzs->next_in = NULL;
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Py_XDECREF(result);
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return NULL;
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}
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diff --git a/Modules/_lzmamodule.c b/Modules/_lzmamodule.c
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index 7bbd6569aa..103a6ef86c 100644
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--- a/Modules/_lzmamodule.c
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+++ b/Modules/_lzmamodule.c
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@@ -1114,6 +1114,7 @@ decompress(Decompressor *d, uint8_t *data, size_t len, Py_ssize_t max_length)
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return result;
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error:
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+ lzs->next_in = NULL;
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Py_XDECREF(result);
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return NULL;
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}
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diff --git a/Modules/zlibmodule.c b/Modules/zlibmodule.c
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index f94c57e4c8..9759593b6a 100644
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--- a/Modules/zlibmodule.c
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+++ b/Modules/zlibmodule.c
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@@ -1645,6 +1645,7 @@ decompress(ZlibDecompressor *self, uint8_t *data,
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return result;
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error:
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+ self->zst.next_in = NULL;
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Py_XDECREF(result);
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return NULL;
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}
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