DEBIAN-CVE-2025-62495
- Source
- https://security-tracker.debian.org/tracker/CVE-2025-62495
- Import Source
- https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-62495.json
- JSON Data
- https://api.osv.dev/v1/vulns/DEBIAN-CVE-2025-62495
- Upstream
- Published
- 2025-10-16T16:15:40Z
- Modified
- 2026-09-01T20:04:35Z
- Severity
-
- 8.8 (High) CVSS_V3 - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- [none]
- Details
-
An integer overflow vulnerability exists in the QuickJS regular expression engine (libregexp) due to an inconsistent representation of the bytecode buffer size. * The regular expression bytecode is stored in a DynBuf structure, which correctly uses a $\text{size}_\text{t}$ (an unsigned type, typically 64-bit) for its size member. * However, several functions, such as re_emit_op_u32 and other internal parsing routines, incorrectly cast or store this DynBuf $\text{size}_\text{t}$ value into a signed int (typically 32-bit). * When a large or complex regular expression (such as those generated by a recursive pattern in a Proof-of-Concept) causes the bytecode size to exceed $2^{31}$ bytes (the maximum positive value for a signed 32-bit integer), the size value wraps around, resulting in a negative integer when stored in the int variable (Integer Overflow). * This negative value is subsequently used in offset calculations. For example, within functions like re_parse_disjunction, the negative size is used to compute an offset (pos) for patching a jump instruction. * This negative offset is then incorrectly added to the buffer pointer (s->byte_code.buf + pos), leading to an out-of-bounds write on the first line of the snippet below: put_u32(s->byte_code.buf + pos, len);
- References
Affected packages
Debian:13 / quickjs
Package
- Name
- quickjs
- Purl
- pkg:deb/debian/quickjs?arch=source&distro=trixie
Debian:14 / quickjs
Package
- Name
- quickjs
- Purl
- pkg:deb/debian/quickjs?arch=source&distro=forky