JLSEC-2026-813 Crafted HTJ2K compressed EXR files can trigger out of bounds reads in OpenEXR

OpenEXR is the reference implementation and specification for the EXR image format, widely used in the motion picture industry. In versions 3.4.0 through 3.4.11, the HTJ2K High-Throughput JPEG 2000 decoder, htundoimpl in OpenEXRCore is vulnerable to a heap-buffer-overflow READ. The htundoimp...

JLSEC-2026-812 Heap buffer overflow when decoding a malicious HTJ2K-compressed EXR file

OpenEXR is the reference implementation and specification for the EXR image format, widely used in the motion picture industry. In versions 3.4.0 through 3.4.11, an integer overflow in htundoimpl in src/lib/OpenEXRCore/internalht.cpp leads to a heap-buffer overflow when decoding a crafted...

JLSEC-2026-807 Integer overflow in OpenEXR's `internal_dwa_compressor`

OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. In versions 3.4.0 through 3.4.9, 3.3.0 through 3.3.9, and 3.2.0 through 3.2.7, internaldwacompressor.h:1722 performs curc-width curc-height in int32...

JLSEC-2026-808 Integer overflow in OpenEXR's `internal_dwa_compressor`

OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. In versions 3.4.0 through 3.4.9, 3.3.0 through 3.3.9, and 3.2.0 through 3.2.7, internaldwacompressor.h:1040 performs chan-width chan-bytesperelement in...

JLSEC-2026-806 Reading malicious EXR files can cause out-of-bounds writes

OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. Versions 3.4.0 through 3.4.9 have a signed integer overflow vulnerability in OpenEXR's HTJ2K High-Throughput JPEG 2000 decompression path. The htundoimp...

JLSEC-2026-811 A malicious EXR file can trigger undefined behavior in OpenEXR

OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From versions 3.0.0 to before 3.2.9, 3.3.0 to before 3.3.11, and 3.4.0 to before 3.4.11, readVariableLengthInteger decodes a variable-length integer fro...

JLSEC-2026-805 Apache Arrow: Potential use-after-free when reading IPC file with pre-buffering

Use After Free vulnerability in Apache Arrow C++. This issue affects Apache Arrow C++ from 15.0.0 through 23.0.0. It can be triggered when reading an Arrow IPC file but not an IPC stream with pre-buffering enabled, if the IPC file contains data with variadic buffers such as Binary View and String...

JLSEC-2026-801 Native TLS accepts undersized or malformed RSA certificate public keys

Reseau 1.1.0 through 1.3.1 enforce an upper bound on RSA certificate keys but no minimum modulus size and no sanity checks on the public exponent. A certificate chain containing a factorable RSA key can therefore pass Reseau's key-strength checks. Impact Exploitation requires a weak RSA key to...

JLSEC-2026-797 Windows IOCP lifetime bugs can corrupt memory during cancellation or shutdown

Reseau releases before 1.3.3 contain related lifetime defects in the Windows I/O completion port IOCP backend. During cancellation or event-loop shutdown, the package can stop retaining memory that the Windows kernel still owns. A remote peer that can time or stall I/O around application-driven...

JLSEC-2026-802 TLS 1.2 session resumption can renew one master secret indefinitely

Reseau 1.1.0 through 1.3.1 issue a fresh TLS 1.2 session ticket after a resumed handshake by copying the original master secret while resetting the ticket's creation and expiry times. A client that resumes at least once during every ticket lifetime can keep the same master secret valid...

JLSEC-2026-798 TLS 1.3 KeyUpdate handling can race concurrent writes

Reseau 1.1.0 through 1.3.1 process a peer-requested TLS 1.3 KeyUpdateupdaterequested response from the read path without acquiring the connection's write lock. A connected peer can race that response against an application task writing on the same connection. Impact The two tasks can concurrently...

JLSEC-2026-803 Windows IOCP poller races unsynchronized registration tables

Reseau 1.0.0 through 1.3.1 access the Windows I/O completion port IOCP backend's registration dictionary and zombie vector concurrently from the poller and application threads without consistently taking the same lock. A remote peer can increase the likelihood of the race by driving connection...

JLSEC-2026-796 XSS via unescaped code-fence language in default code block renderer

Hugo is a static site generator. From 0.60.0 until 0.163.3, Hugo's default code-block renderer wrote the Markdown code-fence language or info-string into the code class="language-…" data-lang="…" wrapper without HTML escaping. A fence info-string containing a quote and a script payload breaks out...

JLSEC-2026-795 Hugo: security.http.urls allow-list bypass via HTTP redirects

Commit: 86fbb0f7a8 — security: Validate redirects against security.http.urls Affected versions: v0.91.0 when security.http.urls was introduced through v0.161.1. Fixed in: v0.162.0. Severity: Only relevant for sites that rely on security.http.urls as a trust boundary — e.g. CI builds that fetch...

JLSEC-2026-794 Hugo: XSS via text/html content files

Commit: e41a06447d — Disallow HTML content by default Affected versions: all Hugo versions prior to v0.162.0. Fixed in: v0.162.0. Severity: Low to Medium, depending on threat model. Not an issue if you fully trust every file under /content and every content adapter you load. Description. Hugo...

JLSEC-2026-792 Hugo: Certain markdown links are not properly escaped

Impact Links and image links in the default markdown to HTML renderer are not properly escaped. Hugo users who trust their Markdown content or have custom render hooks for links and images are not affected. Patches Patched in v0.159.2 Workarounds Create custom render hooks for links and images in...

JLSEC-2026-791 Writing to SFTP files resulting in sending out-of-bounds data to the server

Impact The write::SftpFile, ::DenseVector method assumed that the element type of the input vector had a size of 1 byte e.g. Int8/UInt8, and used lengthdata instead of sizeofdata to get the number of bytes to send. If the input vector had a eltype with size more than 1 byte then this would result...

JLSEC-2026-790 A malicious h.265 bitstream can cause integer overflow and out of bounds writes in libde265

libde265 is an open source implementation of the h.265 video codec. Prior to version 1.1.0, a crafted H.265 bitstream with large SPS dimensions and 16-bit bit depth causes a signed integer overflow in de265imagegetbuffer libde265/image.cc:128. The overflow wraps the plane allocation size to a sma...

JLSEC-2026-786 Integer overflow in gawk's `builtin.c` can cause buffer overflow and denial of service

Integer overflow vulnerability has been found in "builtin.c" program file of gawk. This issue may lead to memory exhaustion on the hosting operating system and could be used to overwrite gawk heap metadata and objects with attacker-controlled bytes. It affects gawk in versions 5.4.0 and below...

JLSEC-2026-787 Integer overflow in gawk's `do_sub()` can cause buffer overflow and denial of service

Integer overflow vulnerability has been found in "builtin.c" program file of gawk dosub routine. This issue could be used to overwrite gawk heap metadata and objects causing the program to crash. It affects 32-bit builds of gawk in versions 5.4.0 and below...

JLSEC-2026-788 Buffer overflow in gawk's `readdir.c` can cause denial of service and possible code execution

Buffer overflow vulnerability has been found in "extension/readdir.c" program file of gawk ftype routine. This issue could be used to crash the program and potentially to achieve code execution, although the latter has not been confirmed to be feasible. It affects gawk in versions 5.4.0 and below...

JLSEC-2026-781

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...

JLSEC-2026-782

A flaw was found in libssh. A remote attacker, by controlling client configuration files or knownhosts files, could craft specific hostnames that when processed by the matchpattern function can lead to inefficient regular expression backtracking. This can cause timeouts and resource exhaustion,...

JLSEC-2026-783

A flaw was found in libssh in which a malicious SFTP SSH File Transfer Protocol server can exploit this by sending a malformed 'longname' field within an SSHFXPNAME message during a file listing operation. This missing null check can lead to reading beyond allocated memory on the heap. This can...

JLSEC-2026-779

A malicious SCP server can send unexpected paths that could make the client application override local files outside of working directory. This could be misused to create malicious executable or configuration files and make the user execute them under specific consequences. This is the same issue...

JLSEC-2026-784

A weakness has been identified in libssh up to 0.11.3. The impacted element is the function sftpextensionsgetname/sftpextensionsgetdata of the file src/sftp.c of the component SFTP Extension Name Handler. Executing a manipulation of the argument idx can lead to out-of-bounds read. The attack may ...

JLSEC-2026-778

A flaw was found in libssh. This vulnerability allows local man-in-the-middle attacks, security downgrades of SSH Secure Shell connections, and manipulation of trusted host information, posing a significant risk to the confidentiality, integrity, and availability of SSH communications via an...

JLSEC-2026-776

HarfBuzz is a text shaping engine. Starting with 8.5.0 through 10.0.1, there is a heap-based buffer overflow in the hbcairoglyphsfrombuffer function...

JLSEC-2026-777

HarfBuzz is a text shaping engine. Prior to version 12.3.0, a null pointer dereference vulnerability exists in the SubtableUnicodesCache::create function located in src/hb-ot-cmap-table.hh. The function fails to check if hbmalloc returns NULL before using placement new to construct an object at t...

JLSEC-2026-775

DuckDB is a SQL database management system. DuckDB implemented block-based encryption of DB on the filesystem starting with DuckDB 1.4.0. There are a few issues related to this implementation. The DuckDB can fall back to an insecure random number generator pcg32 to generate cryptographic keys or...

JLSEC-2026-774 `sniff_csv` provides filesystem access even when `enable_external_access` is disabled in duckdb

Summary Content in filesystem is accessible for reading using sniffcsv, even with enableexternalaccess=false. Details During a pentest, a security researcher was able to access environment variable data and other system data by using the sniffcsv function, even though we set enableexternalaccess ...

JLSEC-2026-773

The bsonvalidate function may return early on specific inputs and incorrectly report success. This behavior could result in skipping validation for BSON data, allowing malformed or invalid UTF-8 sequences to bypass validation and be processed incorrectly. The issue may affect applications that re...

JLSEC-2026-768 A vulnerability was identified in OSGeo gdal up to 3.13.0dev-4

A vulnerability was identified in OSGeo gdal up to 3.13.0dev-4. This issue affects the function SWnentries of the file frmts/hdf4/hdf-eos/SWapi.c. Such manipulation of the argument DimensionName leads to heap-based buffer overflow. The attack must be carried out locally. The exploit is publicly...

JLSEC-2026-772 A vulnerability has been found in OSGeo gdal up to 3.13.0dev-4

A vulnerability has been found in OSGeo gdal up to 3.13.0dev-4. Affected by this issue is the function GDSDfldsrch of the file frmts/hdf4/hdf-eos/GDapi.c of the component Grid File Handler. The manipulation leads to heap-based buffer overflow. An attack has to be approached locally. The exploit h...

JLSEC-2026-764 In affected libpcap versions during the setup of a remote packet capture the internal function...

In affected libpcap versions during the setup of a remote packet capture the internal function sockinitaddress calls getaddrinfo and possibly freeaddrinfo, but does not clearly indicate to the caller function whether freeaddrinfo still remains to be called after the function returns. This makes i...

JLSEC-2026-761

iPerf3 before 3.17, when used with OpenSSL before 3.2.0 as a server with RSA authentication, allows a timing side channel in RSA decryption operations. This side channel could be sufficient for an attacker to recover credential plaintext. It requires the attacker to send a large number of message...

JLSEC-2026-763

In iperf before 3.19.1, iperfauth.c has a Base64Decode assertion failure and application exit upon a malformed authentication attempt...

JLSEC-2026-762

In iperf before 3.19.1, iperfauth.c has an off-by-one error and resultant heap-based buffer overflow...

JLSEC-2026-759

iperf3 before 3.14 allows peers to cause an integer overflow and heap corruption via a crafted length field...

JLSEC-2026-760

A flaw was found in iperf, a utility for testing network performance using TCP, UDP, and SCTP. A malicious or malfunctioning client can send less than the expected amount of data to the iperf server, which can cause the server to hang indefinitely waiting for the remainder or until the connection...

JLSEC-2026-687 With TLS 1.2 connections a client can use any digest, specifically a weaker digest that is...

With TLS 1.2 connections a client can use any digest, specifically a weaker digest that is supported, rather than those in the CertificateRequest...

JLSEC-2026-684 A malicious TLS1.2 server can force a TLS1.3 client with downgrade capability to use a ciphersuite...

A malicious TLS1.2 server can force a TLS1.3 client with downgrade capability to use a ciphersuite that it did not agree to and achieve a successful connection. This is because, aside from the extensions, the client was skipping fully parsing the server hello...

JLSEC-2026-674

In wolfSSL before 5.5.2, if callback functions are enabled via the WOLFSSLCALLBACKS flag, then a malicious TLS 1.3 client or network attacker can trigger a buffer over-read on the heap of 5 bytes. WOLFSSLCALLBACKS is only intended for debugging...

JLSEC-2026-691 A stack buffer overflow vulnerability exists in wolfSSL's PKCS7 SignedData encoding functionality

A stack buffer overflow vulnerability exists in wolfSSL's PKCS7 SignedData encoding functionality. In wcPKCS7BuildSignedAttributes, when adding custom signed attributes, the code passes an incorrect capacity value esd-signedAttribsCount to EncodeAttributes instead of the remaining available space...

JLSEC-2026-718 Heap buffer overflow in DTLS 1.3 ACK message processing

Heap buffer overflow in DTLS 1.3 ACK message processing. A remote attacker can send a crafted DTLS 1.3 ACK message that triggers a heap buffer overflow...

JLSEC-2026-748 The ML-KEM ARM64 NEON ciphertext comparison only compares half of the input, breaking the...

The ML-KEM ARM64 NEON ciphertext comparison only compares half of the input, breaking the Fujisaki-Okamoto transform's implicit rejection and weakening IND-CCA2 security on that code path. The constant-time comparison effectively ignored part of the re-encrypted ciphertext, so a decapsulating par...

JLSEC-2026-705 Protection mechanism failure in wolfCrypt post-quantum implementations (ML-KEM and ML-DSA) in...

Protection mechanism failure in wolfCrypt post-quantum implementations ML-KEM and ML-DSA in wolfSSL on ARM Cortex-M microcontrollers allows a physical attacker to compromise key material and/or cryptographic outcomes via induced transient faults that corrupt or redirect seed/pointer values during...

JLSEC-2026-719

A stack buffer overflow exists in wolfSSL's PKCS7 implementation in the wcPKCS7DecryptOri function in wolfcrypt/src/pkcs7.c. When processing a CMS EnvelopedData message containing an OtherRecipientInfo ORI recipient, the function copies an ASN.1-parsed OID into a fixed 32-byte stack buffer...

JLSEC-2026-717

URI nameConstraints from constrained intermediate CAs are parsed but not enforced during certificate chain verification in wolfcrypt/src/asn.c. A compromised or malicious sub-CA could issue leaf certificates with URI SAN entries that violate the nameConstraints of the issuing CA, and wolfSSL woul...

JLSEC-2026-726 wolfSSL's ECCSI signature verifier `wc_VerifyEccsiHash` decodes the `r` and `s` scalars from the...

wolfSSL's ECCSI signature verifier wcVerifyEccsiHash decodes the r and s scalars from the signature blob via mpreadunsignedbin with no check that they lie in 1, q-1. A crafted forged signature could verify against any message for any identity, using only publicly-known constants...