[xml/sgml-pkgs] Bug#993638: libxml2: XHTML 1.0 validation is broken

Sat Sep 4 02:40:17 BST 2021

Package: libxml2
Version: 2.9.12+dfsg-3
Severity: grave
Justification: renders package unusable

After the upgrade to 2.9.12+dfsg-3, XHTML 1.0 validation is broken.
There was no such issue with 2.9.10+dfsg-6.7.

Testcase:

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head><title>title</title></head>
<body><p>text</p></body>
</html>

$ xmllint --noout --loaddtd --valid test.html
error : xmlAddEntity: invalid redeclaration of predefined entity
error : xmlAddEntity: invalid redeclaration of predefined entity

-- System Information:
Debian Release: bookworm/sid
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'stable-security'), (500, 'unstable'), (500, 'testing'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 5.10.0-8-amd64 (SMP w/8 CPU threads)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=POSIX, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages libxml2 depends on:
ii  libc6     2.31-17
ii  libicu67  67.1-7
ii  liblzma5  5.2.5-2
ii  zlib1g    1:1.2.11.dfsg-2

libxml2 recommends no packages.

libxml2 suggests no packages.

-- no debconf information

-- 
Vincent Lefèvre <vincent at vinc17.net> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)