libcoap3: A memory disclosure vulnerability exists in libcoap's OSCORE configuration parser in libcoap before release-4.3.5-pat...
CVE-2025-59391 is fixed in 8 products on 1 platform, first by DEBIAN-CVE-2025-59391, released December 8, 2025. It is not reported as exploited. Patch Radar priority: Routine.
A memory disclosure vulnerability exists in libcoap's OSCORE configuration parser in libcoap before release-4.3.5-patches. An out-of-bounds read may occur when parsing certain configuration values, allowing an attacker to infer or read memory beyond string boundaries in the .rodata section. This could potentially lead to information disclosure or denial of service.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libcoap · Fedora 43 | 4.3.5b-1.fc43 | FEDORA-2026-0CE923A09D | Apr 17, 2026 |
| libcoap-debuginfo · Fedora 43 | 4.3.5b-1.fc43 | FEDORA-2026-0CE923A09D | Apr 17, 2026 |
| libcoap-debugsource · Fedora 43 | 4.3.5b-1.fc43 | FEDORA-2026-0CE923A09D | Apr 17, 2026 |
| libcoap-devel · Fedora 43 | 4.3.5b-1.fc43 | FEDORA-2026-0CE923A09D | Apr 17, 2026 |
| libcoap-doc · Fedora 43 | 4.3.5b-1.fc43 | FEDORA-2026-0CE923A09D | Apr 17, 2026 |
| libcoap-utils · Fedora 43 | 4.3.5b-1.fc43 | FEDORA-2026-0CE923A09D | Apr 17, 2026 |
| libcoap-utils-debuginfo · Fedora 43 | 4.3.5b-1.fc43 | FEDORA-2026-0CE923A09D | Apr 17, 2026 |
| libcoap3 · Debian 13.5 (trixie) | 4.3.4-1.1+deb13u2 | DEBIAN-CVE-2025-59391 | Dec 8, 2025 |
| libcoap3 · Debian 14 | 4.3.5-2 | DEBIAN-CVE-2025-59391 | Dec 8, 2025 |
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