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CVE-2026-58012 is a buffer over-read vulnerability in GLib affecting the g_regex_replace function. The flaw occurs when g_regex_replace is used with the G_REGEX_RAW compile flag together with case-change replacement escapes. In this code path, matched substrings are processed by string_append using UTF-8 helper logic, including g_utf8_next_char, even though the input is being handled as raw bytes rather than validated UTF-8 text. This mismatch can cause reads past the end of the intended buffer while processing replacement data. The issue is rooted in treating non-UTF-8 raw byte sequences as if they were valid UTF-8 during replacement handling.
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17 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability referenced in an Oracle Linux ELSA advisory affecting glib2-related packages; no further technical details are provided in the content.
A specific vulnerability referenced in an AlmaLinux security advisory affecting glib2 packages; no further technical details are provided in the content.
A GLib buffer over-read vulnerability in g_regex_replace() via glib/gregex.c:string_append() and g_utf8_next_char().
A vulnerability referenced in the Oracle Linux advisory for glib2 packages.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.