CVE-2026-95115

Denial of Service via Buffer Overflow in libwebsockets LEJP JSON Parser

Buffer Overflow vulnerability in libwebsockets main 106d542c allows a remote attacker to cause a denial of service via the LEJP JSON parser

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed

Vendors

Warmcat

Products

Libwebsockets

CVE-2026-95114

libwebsockets: libwebsockets: Denial of Service via out-of-bounds read in LEJP parser

libwebsockets contains an out-of-bounds read vulnerability in the LEJP incremental parser in lib/misc/lejp.c. This allows a remote attacker to cause a denial of service

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed

Vendors

Warmcat

Products

Libwebsockets

CVE-2026-78161

warmcat libwebsockets LECP CBOR Recording lecp.c report_raw_cbor out-of-bounds write

A vulnerability was found in warmcat libwebsockets 4.5.0. Impacted is the function report_raw_cbor of the file lib/misc/lecp.c of the component LECP CBOR Recording. The manipulation results in out-of-bounds write. The attack can be launched remotely. The exploit has been made public and could be used. The patch is identified as 1d44554a1bb262db63ff4e240152a9deecd99054. It is best practice to apply a patch to resolve this issue.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed

Vendors

Warmcat

Products

Libwebsockets

CVE-2026-10650

warmcat libwebsockets SSH Protocol sshd.c lws_ssh_parse_plaintext resource consumption

A flaw has been found in warmcat libwebsockets up to 4.5.8. This issue affects the function lws_ssh_parse_plaintext of the file plugins/protocol_lws_ssh_base/sshd.c of the component SSH Protocol Handler. Executing a manipulation of the argument msg_len can lead to resource consumption. The attack may be launched remotely. The exploit has been published and may be used. This patch is called 3f9f0c6ecaf0e6f3f219d30632c5d1f2479d7498. A patch should be applied to remediate this issue.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed

Vendors

Warmcat

Products

Libwebsockets

CVE-2025-11677

Use After Free in libwebsockets WebSocket server

Use After Free in WebSocket server implementation in lws_handshake_server in warmcat libwebsockets may allow an attacker, in specific configurations where the user provides a callback function that handles LWS_CALLBACK_HTTP_CONFIRM_UPGRADE, to achieve denial of service.

CVSS 4.0 · 6.3 Medium EPSS < 1% KEV · Not listed

Vendors

Warmcat

Products

Libwebsockets

CVE-2025-11680

Out-of-bounds Write in libwebsockets PNG parsing

Out-of-bounds Write in unfilter_scanline in warmcat libwebsockets allows, when the LWS_WITH_UPNG flag is enabled during compilation and the HTML display stack is used, to write past a heap allocated buffer possibly causing a crash, when the user visits an attacker controlled website that contains a crafted PNG file with a big width value that causes an integer overflow which value is used for determining the size of a heap allocation.

CVSS 4.0 · 5.9 Medium EPSS < 1% KEV · Not listed

Vendors

Warmcat

Products

Libwebsockets

CVE-2025-11679

Out-of-bounds Read in libwebsockets PNG parsing

Out-of-bounds Read in lws_upng_emit_next_line in warmcat libwebsockets allows, when the LWS_WITH_UPNG flag is enabled during compilation and the HTML display stack is used, to read past a heap allocated buffer possibly causing a crash, when the user visits an attacker controlled website that contains a crafted PNG file with a big height dimension.

CVSS 4.0 · 5.9 Medium EPSS < 1% KEV · Not listed

Vendors

Warmcat

Products

Libwebsockets

CVE-2025-11678

Stack-based Buffer Overflow in libwebsockets DNS response parsing

Stack-based Buffer Overflow in lws_adns_parse_label in warmcat libwebsockets allows, when the LWS_WITH_SYS_ASYNC_DNS flag is enabled during compilation, to overflow the label_stack, when the attacker is able to sniff a DNS request in order to craft a response with a matching id containing a label longer than the maximum.

CVSS 4.0 · 7.5 High EPSS < 1% KEV · Not listed

Vendors

Warmcat

Products

Libwebsockets