QuickJS is a compact JavaScript interpreter and engine that, despite a narrow product scope, occupies a relatively prominent position in embedded and runtime contexts where memory safety challenges are endemic. Its vulnerability footprint recurs through memory-handling weakness classes including use-after-free conditions, out-of-bounds reads, buffer overflows, and incorrect size calculations, reflecting the hazards of implementing a dynamic language runtime in C. Defenders should monitor this vendor's releases where QuickJS is embedded in larger applications or trusted to execute untrusted scripts; live severity and exploitation figures are shown alongside this summary.
The number and severity of CVEs published that impact products developed by Quickjs Project over time
Signals from CVEs in this vendor scope (15 CVEs).
15 CVEs · Highest risk first
| CVE | Published | CVSS | Risk | KEV | Exploit |
|---|---|---|---|---|---|
CVE-2025-62495HIGH An integer overflow vulnerability exists in the QuickJS regular expression engine (libregexp) due to an inconsistent representation of the bytecode buffer size.
* The regular e | Oct 16, 2025 | 8.8 | 28 | NO | NO |
CVE-2025-62494HIGH A type confusion vulnerability exists in the handling of the string addition (+) operation within the QuickJS engine.
* The code first checks if the left-hand operand is a stri | Oct 16, 2025 | 8.8 | 28 | NO | NO |
CVE-2025-62491HIGH A Use-After-Free (UAF) vulnerability exists in the QuickJS engine's standard library when iterating over the global list of unhandled rejected promises (ts->rejected_promise_list). | Oct 16, 2025 | 8.8 | 28 | NO | NO |
CVE-2025-62490HIGH In quickjs, in js_print_object, when printing an array, the function first fetches the array length and then loops over it. The issue is, printing a value is not side-effect free. | Oct 16, 2025 | 8.8 | 28 | NO | NO |
CVE-2025-62496HIGH A vulnerability exists in the QuickJS engine's BigInt string parsing logic (js_bigint_from_string) when attempting to create a BigInt from a string with an excessively large number | Oct 16, 2025 | 8.8 | 27 | NO | NO |
CVE-2023-31922HIGH QuickJS commit 2788d71 was discovered to contain a stack-overflow via the component js_proxy_isArray at quickjs.c. | May 12, 2023 | 7.5 | 24 | NO | NO |
CVE-2020-22876HIGH Buffer Overflow vulnerability in quickjs.c in QuickJS, allows remote attackers to cause denial of service. This issue is resolved in the 2020-07-05 release. | Jul 13, 2021 | 7.5 | 23 | NO | NO |
CVE-2025-69654HIGH A crafted JavaScript input executed with the QuickJS release 2025-09-13, fixed in commit fcd33c1afa7b3028531f53cd1190a3877454f6b3 (2025-12-11),`qjs` interpreter using the `-m` opti | Mar 6, 2026 | 7.5 | 22 | NO | NO |
CVE-2025-69653MEDIUM A crafted JavaScript input can trigger an internal assertion failure in QuickJS release 2025-09-13, fixed in commit 1dbba8a88eaa40d15a8a9b70bb1a0b8fb5b552e6 (2025-12-11), in file g | Mar 6, 2026 | 6.5 | 22 | NO | NO |
CVE-2025-62493MEDIUM A vulnerability exists in the QuickJS engine's BigInt string conversion logic (js_bigint_to_string1) due to an incorrect calculation of the required number of digits, which in turn | Oct 16, 2025 | 6.5 | 22 | NO | NO |
Signals from CVEs in this vendor scope (15 CVEs).
An overview of all social media posts that mention a CVE ID that affects a product developed by Quickjs Project.
Media articles that mention a CVE ID that affects a product developed by Quickjs Project — matched by CVE ID, not by vendor name.