Bug 2554499 (CVE-2026-110756)

Summary: CVE-2026-110756 perl-text-csv_xs: Text::CSV_XS: Data corruption via invalid UTF-8 byte sequences
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
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Hardware: All   
OS: Linux   
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A flaw was found in Text::CSV_XS. When printing records where a UTF-8 flagged field precedes invalid UTF-8 bytes, the module drops held-back bytes, closing quotes, and line endings without signaling an error. An attacker capable of providing crafted input can exploit this flaw to cause data corruption, resulting in subsequent records being merged or misinterpreted by downstream parsers.
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Description OSIDB Bzimport 2026-10-16 22:21:29 UTC 
Text::CSV_XS versions before 1.65 for Perl drop the end of a record and its line ending when a UTF-8 flagged field precedes invalid UTF-8 bytes in print.

When a record contains a UTF-8 flagged field, print holds back trailing bytes that are not valid UTF-8 at each buffer flush, so that a character split across two flushes can be completed. Nothing writes the held-back bytes after the record's final flush. A record whose last field ends in such a byte loses it, any closing quote and the line ending, while print still returns true. combine is not affected.

The next record is written onto the same line, or, when the last field was quoted, the missing closing quote makes a reader take every following record as part of that field.