dnsmasq: NSEC bitmap parsing infinite loop

A denial of service vulnerability was discovered in dnsmasq's DNSSEC validation. When parsing NSEC and NSEC3 bitmap records, the window iteration logic fails to account for the 2-byte window header when advancing through the bitmap data. A specially crafted DNS response with a zero-length bitmap...

libssh: libssh: Denial of Service via zero-length input in ssh_get_hexa()

A flaw was found in libssh. The API function sshgethexa is vulnerable to a denial of service when processing zero-length input. This can be exploited remotely by an attacker during GSSAPI Generic Security Service Application Program Interface authentication if the server's logging verbosity is se...

libssh: libssh: Denial of Service via zero-length input in ssh_get_hexa()

A flaw was found in libssh. The API function sshgethexa is vulnerable to a denial of service when processing zero-length input. This can be exploited remotely by an attacker during GSSAPI Generic Security Service Application Program Interface authentication if the server's logging verbosity is se...

CVE-2025-56352

In tinyMQTT commit 6226ade15bd4f97be2d196352e64dd10937c1962 2024-02-18, the broker mishandles protocol violations during CONNECT packet parsing. When receiving a CONNECT packet with a zero-length Client ID while CleanSession is set to 0, the broker correctly replies with a CONNACK return code 0x0...

EUVD-2025-209887

In tinyMQTT commit 6226ade15bd4f97be2d196352e64dd10937c1962 2024-02-18, the broker mishandles protocol violations during CONNECT packet parsing. When receiving a CONNECT packet with a zero-length Client ID while CleanSession is set to 0, the broker correctly replies with a CONNACK return code 0x0...

CVE-2025-56352

CVE-2025-56352 affects the tinyMQTT broker. When processing a CONNECT packet with a zero-length Client ID and CleanSession=0, the broker returns CONNACK 0x02 (Identifier Rejected) but fails to explicitly close the TCP connection, leaving the socket open. Repeated invalid CONNECT attempts can exha...

CLSA-2026-1778944149 libsoup: Fix of CVE-2026-2369

CVE-2026-2369: fix integer underflow in sniffunknown on zero-length buffer that caused an out-of-bounds read in the content sniffer...

CLSA-2026-1778894153 libarchive: Fix of CVE-2025-60753

CVE-2025-60753: denial of service in bsdtar -s substitution when the regular expression matches a zero-length string, causing an infinite loop in applysubstitution...

CLSA-2026-1778893359 libarchive: Fix of CVE-2025-60753

CVE-2025-60753: denial of service in bsdtar -s substitution when the regular expression matches a zero-length string, causing an infinite loop in applysubstitution...

CVE-2026-44699

LibJWT is a C JSON Web Token Library. From 3.0.0 to 3.3.2, libjwt accepts an RSA JWK that does not contain an alg parameter as the verification key for an HS256/HS384/HS512 token. In the OpenSSL backend, this causes HMAC verification to run with a zero-length key, so an attacker can forge a valid...

CVE-2026-44699

LibJWT is a C JSON Web Token Library. From 3.0.0 to 3.3.2, libjwt accepts an RSA JWK that does not contain an alg parameter as the verification key for an HS256/HS384/HS512 token. In the OpenSSL backend, this causes HMAC verification to run with a zero-length key, so an attacker can forge a valid...

CLSA-2026-1778772686 libsoup: Fix of CVE-2026-2369

CVE-2026-2369: fix integer underflow in sniffunknown on zero-length buffer that caused an out-of-bounds read in the content sniffer...

CLSA-2026-1778662869 libsoup: Fix of CVE-2026-2369

CVE-2026-2369: fix integer underflow in sniffunknown on zero-length buffer that caused an out-of-bounds read in the content sniffer...

CVE-2026-4890

A denial of service vulnerability was discovered in dnsmasq's DNSSEC validation. When parsing NSEC and NSEC3 bitmap records, the window iteration logic fails to account for the 2-byte window header when advancing through the bitmap data. A specially crafted DNS response with a zero-length bitmap...

kernel: out-of-bound read in memcpy_fromiovecend()

A flaw was found in the Linux kernel that allows the userspace to call memcpyfromiovecend and similar functions with a zero offset and buffer length. This can cause a read beyond the buffer boundaries flaw and, in certain cases, cause a memory access fault and a system halt by accessing invalid...

Gnutls: gnutls: denial of service via dtls zero-length fragment

...

CVE-2026-43244

A flaw was found in the Linux kernel's Kernel Connection Multiplexer KCM module. A local user could trigger an issue where, during partial sendmsg operations, an empty network buffer skb is incorrectly left in the fraglist. A subsequent zero-length write operation can then cause a kernel warning,...

fast-jwt: JWT auth bypass due to empty HMAC secret accepted by async key resolver

Summary A critical authentication-bypass vulnerability in fast-jwt's async key-resolver flow allows any unauthenticated attacker to forge arbitrary JWTs that are accepted as authentic. When the application's key resolver returns an empty string '', for example via the common keysdecoded.header.ki...

CVE-2026-43187

A flaw was found in the Linux kernel's XFS filesystem. Incorrect handling of freemap entries when deleting attribute leaf freemap entries can lead to a situation where zero-length freemap entries with a non-zero base are left behind. Subsequent setxattr operations can cause these entries to overl...

CLSA-2026-1778068747 Fix CVE(s): CVE-2026-0966

SECURITY UPDATE: heap buffer underflow in sshgethexa on zero-length or NULL input, remotely reachable via GSSAPI authentication logging - debian/patches/CVE-2026-0966.patch: reject NULL/zero-length input in sshgethexa in src/dh.c - CVE-2026-0966: fix heap buffer underflow in sshgethexa...