DBI versions before 1.652 for Perl allow a heap out-of-bounds write on 32-bit perl via an integer wraparound in the output buffer size computed by preparse

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-73193
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 13:17:48 UTC
Updated2026-08-15 13:17:48 UTC
DescriptionDBI versions before 1.652 for Perl allow a heap out-of-bounds write on 32-bit perl via an integer wraparound in the output buffer size computed by preparse. preparse reserves its output buffer with `newSV(strlen(statement) * 7 + 16)`, budgeting seven output bytes per input byte for the longest ':p99999' expansion. The product is computed in STRLEN, which is 32 bits wide on a 32-bit perl build, so a statement of 613,566,757 bytes multiplies to 4,294,967,299, wraps modulo 2^32 to 3, and reserves 19 bytes. The parser then copies the statement out through a raw pointer with no capacity check, writing the whole 585 MB input past the end of the allocation. The 99,999 placeholder limit does not bound this path, which is reached by ordinary non-placeholder content. Any caller that passes an untrusted statement of that length to preparse on a 32-bit perl gets a heap out-of-bounds write of attacker controlled bytes. Builds with a 64-bit STRLEN are not affected, since the wrap there needs a statement of about 2.3 exabytes.

Risk And Classification

Problem Types: CWE-190 | CWE-787 | CWE-190 CWE-190 Integer Overflow or Wraparound | CWE-787 CWE-787 Out-of-bounds Write

References

ReferenceSourceLinkTags
github.com/perl5-dbi/dbi/commit/c751ae5a5a6f56c2f8284f37c1f4d43500352ef1... 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com
github.com/perl5-dbi/dbi/security/advisories/GHSA-wj3v-c3hh-mhqr 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com
www.cve.org/CVERecord 9b29abf9-4ab0-4765-b253-1875cd9b441e www.cve.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Chrysostomos Manousis (en)

Additional Advisory Data

Solutions

CNA: Upgrade to DBI 1.652 or later.

Workarounds

CNA: On 32-bit depoyments that cannot be upgraded, limit the size of SQL statements under 292 megabytes.

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