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Vulnerability record · CVE-2026-73194 · published 15 August 2026

CVE-2026-73194: Out-of-bounds write vulnerability

DBI versions before 1.652 for Perl allow a heap out-of-bounds write via an unvalidated numeric placeholder that sets the binder counter in preparse. preparse reserves seven output bytes per input byte, the width of the longest ':p99999' expansion. The ':N' branch parses the number with `atoi(src)` and assigns it to the binder counter with no range check, so a statement containing ':2147483648' leaves the counter negative (-2147483648 with glibc, where atoi wraps). Each following '?' then expands through `sprintf(start, ":p%d", idx++)` to ':p-2147483648', 14 bytes with the terminating NUL where the buffer budgets 7. The placeholder limit added in 1.650 tests the counter against 99,999, which a negative counter passes. Any caller that preparses an untrusted statement into ':pN' style placeholders gets a heap out-of-bounds write that grows with the number of '?' marks following the poisoned placeholder. The '?' and '%s' return styles compare the parsed number against the expected sequence and error out, and are unaffected.

9.1 CVSS 3.1 Critical EPSS 0.49% · top 60.1% CWE-787 · Out-of-bounds writeCWE-1284 · CWE-1284 Awaiting Analysis
9.1CVSS 3.1 base score
0.49%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
28 Aug 2026Last modified by NVD

Description

DBI versions before 1.652 for Perl allow a heap out-of-bounds write via an unvalidated numeric placeholder that sets the binder counter in preparse. preparse reserves seven output bytes per input byte, the width of the longest ':p99999' expansion. The ':N' branch parses the number with `atoi(src)` and assigns it to the binder counter with no range check, so a statement containing ':2147483648' leaves the counter negative (-2147483648 with glibc, where atoi wraps). Each following '?' then expands through `sprintf(start, ":p%d", idx++)` to ':p-2147483648', 14 bytes with the terminating NUL where the buffer budgets 7. The placeholder limit added in 1.650 tests the counter against 99,999, which a negative counter passes. Any caller that preparses an untrusted statement into ':pN' style placeholders gets a heap out-of-bounds write that grows with the number of '?' marks following the poisoned placeholder. The '?' and '%s' return styles compare the parsed number against the expected sequence and error out, and are unaffected.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

References

LinkTags
https://github.com/perl5-dbi/dbi/commit/29b72ae7d2a8114a734a55840bf1c45b89207809.patch
https://github.com/perl5-dbi/dbi/security/advisories/GHSA-623j-hfpc-mrc4
https://www.cve.org/CVERecord?id=CVE-2026-10879
https://www.cve.org/CVERecord?id=CVE-2026-14739

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Source: NIST National Vulnerability Database (record CVE-2026-73194), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.