Vulnerability database
Every flaw the U.S. government’s cybersecurity agency (CISA) has confirmed attackers are using, plus the new WordPress plugin and theme bugs published each day, sorted by what they mean for a small business. We refresh it twice a day. If you see something your website or office runs, tell us.
19 results
Apr 17, 2026libcoap contains out-of-bounds read vulnerabilities in OSCORE Appendix B.2 CBOR unwrap handling where get_byte_inc() in src/oscore/oscore_cbor.c relies solely oCVE-2026-29013 · Other software · libcoap · reported by VulnCheckHigh 8.8
libcoap contains out-of-bounds read vulnerabilities in OSCORE Appendix B.2 CBOR unwrap handling where get_byte_inc() in src/oscore/oscore_cbor.c relies solely on assert() for bounds checking, which is removed in release builds compiled with NDEBUG. Attackers can send crafted CoAP requests with malformed OSCORE options or responses during OSCORE negotiation to trigger out-of-bounds reads during CBOR parsing and potentially cause out-of-bounds reads through integer wraparound in allocation size computation.
- Product
- libcoap
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Dec 31, 2025libcoap versions up to and including 4.3.5, prior to commit 30db3ea, contain a stack-based buffer overflow in address resolution when attacker-controlled hostnaCVE-2025-34468 · Other software · libcoap · reported by VulnCheckHigh 8.2
libcoap versions up to and including 4.3.5, prior to commit 30db3ea, contain a stack-based buffer overflow in address resolution when attacker-controlled hostname data is copied into a fixed 256-byte stack buffer without proper bounds checking. A remote attacker can trigger a crash and potentially achieve remote code execution depending on compiler options and runtime memory protections. Exploitation requires the proxy logic to be enabled (i.e., the proxy request handling code path in an application using libcoap).
- Product
- libcoap
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Dec 8, 2025A memory disclosure vulnerability exists in libcoap's OSCORE configuration parser in libcoap before release-4.3.5-patches.CVE-2025-59391 · Other software · Libcoap · reported by MITREMedium 6.5
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.
- Product
- Libcoap
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Nov 24, 2025Null pointer dereference in coap_dtls_info_callback() in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a DTLS handshake where SSL_CVE-2025-65501 · Other software · Libcoap · reported by MITREMedium 4.3
Null pointer dereference in coap_dtls_info_callback() in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a DTLS handshake where SSL_get_app_data() returns NULL.
- Product
- Libcoap
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Nov 24, 2025NULL pointer dereference in coap_dtls_generate_cookie() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a cCVE-2025-65500 · Other software · Libcoap · reported by MITREMedium 4.3
NULL pointer dereference in coap_dtls_generate_cookie() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS handshake that triggers SSL_get_SSL_CTX() to return NULL.
- Product
- Libcoap
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Nov 24, 2025Array index error in tls_verify_call_back() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS CVE-2025-65499 · Other software · Libcoap · reported by MITREMedium 4.3
Array index error in tls_verify_call_back() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS handshake that triggers SSL_get_ex_data_X509_STORE_CTX_idx() to return -1.
- Product
- Libcoap
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Nov 24, 2025NULL pointer dereference in coap_dtls_generate_cookie() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a cCVE-2025-65498 · Other software · Libcoap · reported by MITREMedium 4.3
NULL pointer dereference in coap_dtls_generate_cookie() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS handshake that triggers SSL_get_SSL_CTX() to return NULL.
- Product
- Libcoap
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Nov 24, 2025NULL pointer dereference in coap_dtls_generate_cookie() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a cCVE-2025-65497 · Other software · Libcoap · reported by MITREMedium 4.3
NULL pointer dereference in coap_dtls_generate_cookie() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS handshake that triggers SSL_get_SSL_CTX() to return NULL.
- Product
- Libcoap
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Nov 24, 2025NULL pointer dereference in coap_dtls_generate_cookie() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a cCVE-2025-65496 · Other software · Libcoap · reported by MITREMedium 4.3
NULL pointer dereference in coap_dtls_generate_cookie() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS handshake that triggers SSL_get_SSL_CTX() to return NULL.
- Product
- Libcoap
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Nov 24, 2025Integer signedness error in tls_verify_call_back() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafteCVE-2025-65495 · Other software · Libcoap · reported by MITREHigh 7.5
Integer signedness error in tls_verify_call_back() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted TLS certificate that causes i2d_X509() to return -1 and be misused as a malloc() size parameter.
- Product
- Libcoap
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Nov 24, 2025NULL pointer dereference in get_san_or_cn_from_cert() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a craCVE-2025-65494 · Other software · Libcoap · reported by MITREHigh 7.5
NULL pointer dereference in get_san_or_cn_from_cert() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted X.509 certificate that causes sk_GENERAL_NAME_value() to return NULL.
- Product
- Libcoap
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Nov 24, 2025NULL pointer dereference in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS/TLS connection thatCVE-2025-65493 · Other software · Libcoap · reported by MITREHigh 7.5
NULL pointer dereference in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS/TLS connection that triggers BIO_get_data() to return NULL.
- Product
- Libcoap
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 14, 2025A use-after-free vulnerability exists in the coap_delete_pdu_lkd function within coap_pdu.c of the libcoap library.CVE-2025-50518 · Other software · reported by MITRECritical 9.8
A use-after-free vulnerability exists in the coap_delete_pdu_lkd function within coap_pdu.c of the libcoap library. This issue occurs due to improper handling of memory after the freeing of a PDU object, leading to potential memory corruption or the possibility of executing arbitrary code. NOTE: this is disputed by the Supplier because it only occurs when an application uses libcoap incorrectly.
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 9, 2024A NULL pointer dereference in libcoap v4.3.5-rc2 and below allows a remote attacker to cause a denial of service via the coap_handle_request_put_block function CVE-2024-46304 · Other software · libcoap · reported by MITREHigh 7.5
A NULL pointer dereference in libcoap v4.3.5-rc2 and below allows a remote attacker to cause a denial of service via the coap_handle_request_put_block function in src/coap_block.c.
- Product
- libcoap
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jun 6, 2024An issue in obgm and Libcoap v.a3ed466 allows a remote attacker to cause a denial of service via thecoap_context_t function in the src/coap_threadsafe.c:297:3 cCVE-2023-51847 · Other software · libcoap · reported by MITREHigh 7.5
An issue in obgm and Libcoap v.a3ed466 allows a remote attacker to cause a denial of service via thecoap_context_t function in the src/coap_threadsafe.c:297:3 component.
- Product
- libcoap
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Apr 17, 2024An issue in `coap_pdu.c` in libcoap 4.3.4 allows attackers to cause undefined behavior via a sequence of messages leading to unsigned integer overflow.CVE-2024-31031 · Other software · libcoap · reported by MITREHigh 7.5
An issue in `coap_pdu.c` in libcoap 4.3.4 allows attackers to cause undefined behavior via a sequence of messages leading to unsigned integer overflow.
- Product
- libcoap
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordgithub.comlists.fedoraproject.org
Jan 27, 2024A vulnerability was found in obgm libcoap 4.3.4.CVE-2024-0962 · Other software · obgm · reported by VulDBMedium 6.3
A vulnerability was found in obgm libcoap 4.3.4. It has been rated as critical. Affected by this issue is the function get_split_entry of the file src/coap_oscore.c of the component Configuration File Handler. The manipulation leads to stack-based buffer overflow. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. It is recommended to apply a patch to fix this issue. VDB-252206 is the identifier assigned to this vulnerability.
- Product
- libcoap
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jun 23, 2023Buffer Overflow vulnerability in coap_send function in libcoap library 4.3.1-103-g52cfd56 fixed in 4.3.1-120-ge242200 allows attackers to obtain sensitive inforCVE-2023-30362 · Other software · Libcoap · reported by MITREHigh 7.5
Buffer Overflow vulnerability in coap_send function in libcoap library 4.3.1-103-g52cfd56 fixed in 4.3.1-120-ge242200 allows attackers to obtain sensitive information via malformed pdu.
- Product
- Libcoap
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jun 19, 2023libcoap 4.3.1 contains a buffer over-read via the function coap_parse_oscore_conf_mem at coap_oscore.c.CVE-2023-35862 · Other software · Libcoap · reported by MITREMedium 6.5
libcoap 4.3.1 contains a buffer over-read via the function coap_parse_oscore_conf_mem at coap_oscore.c.
- Product
- Libcoap
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Where this comes from: the exploited list is CISA’s Known Exploited Vulnerabilities catalog. Everything else is the whole National Vulnerability Database, where each record is published by the team that found the bug (Wordfence, Patchstack, WPScan, the vendors themselves and others); we show who. Exploit odds are FIRST’s EPSS, updated daily. Titles and categories are ours, so check the linked record before acting on a detail. For a write-up of the big ones, see our advisories. Every vendor, and every WordPress plugin and theme with a recorded flaw, also has its own page. All of it is free to reuse as JSON, CSV or RSS.
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