https://cve.radiocsirt.org/rss/recent/all/10 Most recent entries from all 2026-10-09T05:45:48.018493+00:00 Vulnerability-Lookup csirt@opendfir.org python-feedgen Contains only the most 10 recent entries. https://cve.radiocsirt.org/vuln/certfr-2026-avi-0958 certfr-2026-avi-0958 — De multiples vulnérabilités ont été découvertes dans les produits IBM. Certaines d'entre elles permettent à un attaquan… 2026-10-09T05:45:48.088645+00:00 certfr-2026-avi-0958 https://cve.radiocsirt.org/vuln/euvd-2026-331614 EUVD-2026-331614 2026-10-09T05:45:48.088693+00:00 EUVD-2026-331614 https://cve.radiocsirt.org/vuln/fkie_cve-2026-54903 fkie_cve-2026-54903 2026-10-09T05:45:48.088709+00:00

Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.2, Oj.load is vulnerable to heap corruption when parsing a JSON string longer than 2 GB. An integer overflow in buf_append_string (buf.h:61) converts the string length to a large negative size_t, causing memcpy to copy an astronomically large amount of data out of bounds. This crashes the process and can corrupt adjacent heap memory. The issue has been fixed in version 3.17.2.

 https://cve.radiocsirt.org/vuln/ghsa-475m-ph3x-64gp GHSA-475m-ph3x-64gp — Oj: Integer Overflow in Oj.load 2GB String Handling 2026-10-09T05:45:48.088742+00:00

Affected: RubyGems: oj

### Summary

`Oj.load` is vulnerable to heap corruption when parsing a JSON string longer than 2 GB. An integer overflow in `buf_append_string` (`buf.h:61`) converts the string length to a large negative `size_t`, causing `memcpy` to copy an astronomically large amount of data out of bounds. This crashes the process and can corrupt adjacent heap memory.

### Version

- **Software**: oj gem - **Affected**: all versions with `ext/oj/buf.h` and `ext/oj/parse.c` - **Latest tested**: 3.17.1 (confirmed present)

### Details

`ext/oj/buf.h`, line 61:

```c inline static void buf_append_string(Buf buf, const char *s, size_t slen) { // ... memcpy(buf->tail, s, slen); // slen derived from 32-bit int that wrapped negative ```

In `parse.c`, escape sequence handling computes the remaining string length as an `int`:

```c // parse.c:402 (read_escaped_str) int slen = (int)(s - str); // ← wraps to negative when string > 2 GB buf_append_string(buf, str, (size_t)slen); // ← (size_t)(-2147483648) = 0x80000000... ```

ASAN report: ``` ==399019==ERROR: AddressSanitizer: negative-size-param: (size=-2147483648) #0 __asan_memcpy #1 buf_append_string /ext/oj/buf.h:61 #2 read_escaped_str /ext/oj/parse.c:402 #3 read_str /ext/oj/parse.c:542 #4 oj_parse2 /ext/oj/parse.c:882 #5 oj_pi_parse /ext/oj/parse.c:1256 #6 oj_object_parse /ext/oj/object.c:701 #7 load /ext/oj/oj.c:1259 0x7f5a26ff0801 is located 1 bytes insi…

 https://cve.radiocsirt.org/vuln/ubuntu-cve-2026-54903 UBUNTU-CVE-2026-54903 2026-10-09T05:45:48.088791+00:00

Affected: Ubuntu:14.04:LTS: ruby-oj, Ubuntu:16.04:LTS: ruby-oj, Ubuntu:18.04:LTS: ruby-oj, Ubuntu:20.04:LTS: ruby-oj, Ubuntu:22.04:LTS: ruby-oj, Ubuntu:24.04:LTS: ruby-oj, Ubuntu:25.10: ruby-oj, Ubuntu:26.04:LTS: ruby-oj

Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.2, Oj.load is vulnerable to heap corruption when parsing a JSON string longer than 2 GB. An integer overflow in buf_append_string (buf.h:61) converts the string length to a large negative size_t, causing memcpy to copy an astronomically large amount of data out of bounds. This crashes the process and can corrupt adjacent heap memory. The issue has been fixed in version 3.17.2.