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fix(libidn): CVE-2026-57053 - fix buffer overread in IDNA xn-- string processing #2

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fix(libidn): CVE-2026-57053 - fix buffer overread in IDNA xn-- string processing #2

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7 changes: 7 additions & 0 deletions debian/changelog
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Original file line number Diff line number Diff line change
@@ -1,3 +1,10 @@
libidn (CVE-2026-57053+fix1) unstable; urgency=high

* Fix CVE-2026-57053: fix buffer overread in IDNA xn-- string processing
(Closes: CVE-2026-57053)

-- deepin-ci-robot <packages@deepin.org> Fri, 10 Jul 2026 03:13:35 +0800

libidn (1.43-2) unstable; urgency=medium

* Add pull/gen make deps. Closes: #1105425.
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14 changes: 14 additions & 0 deletions debian/patches/CVE-2026-57053.patch
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Original file line number Diff line number Diff line change
@@ -0,0 +1,14 @@
Index: libidn-fix/lib/idna.c
===================================================================
--- libidn-fix.orig/lib/idna.c
+++ libidn-fix/lib/idna.c
@@ -385,7 +385,8 @@ step3:
* step 3, using a case-insensitive ASCII comparison.
*/

- if (c_strcasecmp (utf8in, tmpout + strlen (IDNA_ACE_PREFIX)) != 0)
+ if (c_strncasecmp (tmpout, IDNA_ACE_PREFIX, strlen (IDNA_ACE_PREFIX)) != 0
+ || c_strcasecmp (utf8in, tmpout + strlen (IDNA_ACE_PREFIX)) != 0)
{
free (utf8in);
return IDNA_ROUNDTRIP_VERIFY_ERROR;
1 change: 1 addition & 0 deletions debian/patches/series
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@@ -0,0 +1 @@
CVE-2026-57053.patch
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