Gnu vulnerabilities

CVE-2026-53910 Low · 2.1 CWE-190 Jul 22, 2026

Heap-based Buffer Overflow in GNU diffutils

diff3 tool from GNU diffutils is vulnerable to a heap‑based buffer overflow due to multiple signed integer overflows in line‑mapping calculations. Incorrect arithmetic in mapping line ranges can result in corrupted values being used for memory allocation and loop bounds. When processing crafted diff output, these overflows may cause the application to allocate insufficient memory and subsequently perform out‑of‑bounds writes during internal processing. An attacker who can control the output of the diff program used by diff3 (e.g. via --diff-program pointing to a malicious script) can trigger out-of-bounds writes, resulting in a crash and potentially remote code execution depending on the environment. This issue has been fixed in commit 9ff04d5b84743e331e80b589335a52c5480d1815 NOTE: The project maintainers claim that this is not a security issue. They state that the worst outcome this issue can cause is a crash of diff and that it cannot be used to escalate privileges.

CVE-2026-40553 High · 7.5 CWE-121 Jul 13, 2026

Stack-based buffer overflow in gawk

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.

CVE-2026-40469 Critical · 9.1 CWE-190 Jul 13, 2026

Heap buffer overflow in gawk

Integer overflow vulnerability has been found in "builtin.c" program file of gawk (do_sub() 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.

CVE-2026-40468 Critical · 9.1 CWE-190 Jul 13, 2026

Heap buffer overflow in gawk

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.

CVE-2026-40467 High · 7.5 CWE-416 Jul 13, 2026

Use after free in gawk

Use After Free vulnerability has been found in "io.c" program file of gawk (do_getline_redir() routine). This issue may lead to a crash. It affects gawk in versions 5.4.0 and below.

CVE-2026-15520 Medium · 5.3 CWE-119 Jul 12, 2026

GNU LibreDWG R2004 Section Decompression decode.c decompress_R2004_section heap-based overflow

A vulnerability was determined in GNU LibreDWG 0.13.4-154-g0b573035. This impacts the function decompress_R2004_section of the file src/decode.c of the component R2004 Section Decompression. Executing a manipulation can lead to heap-based buffer overflow. The attack requires local access. The exploit has been publicly disclosed and may be utilized. Upgrading to version 0.14.8396 will fix this issue. This patch is called 3d0f9fc2eddbd6579c99af3111c37c98f03475d0. You should upgrade the affected component.

CVE-2026-15184 Low · 3.3 CWE-404 Jul 9, 2026

GNU LibreDWG DWG File dwg.c dwg_next_entity null pointer dereference

A vulnerability was found in GNU LibreDWG up to 0.13.4. The impacted element is the function dwg_next_entity of the file src/dwg.c of the component DWG File Handler. Performing a manipulation of the argument next_obj results in null pointer dereference. The attack must be initiated from a local position. The exploit has been made public and could be used. Upgrading to version 0.14 is sufficient to resolve this issue. The patch is named dde45dac3c4d902e4d8fed150a8017b9732019c9. Upgrading the affected component is recommended. Different than CVE-2026-9503.

CVE-2026-15182 Medium · 5.3 CWE-119 Jul 9, 2026

GNU LibreDWG BMP Image dwg.c dwg_bmp heap-based overflow

A vulnerability has been found in GNU LibreDWG up to 0.13.4. The affected element is the function dwg_bmp of the file src/dwg.c of the component BMP Image Handler. Such manipulation leads to heap-based buffer overflow. The attack must be carried out locally. The exploit has been disclosed to the public and may be used. Upgrading to version 0.14 is sufficient to fix this issue. The name of the patch is 18fd542bb4d5ccedf9de12052bf50068b2b26f06. It is suggested to upgrade the affected component.

CVE-2026-56289 Medium · 5.5 CWE-835 Jul 9, 2026

Loop with Unreachable Exit Condition in GNU patch

GNU patch is vulnerable to a denial of service (DoS) due to improper validation of hunk (single block of changes in diff) line offsets in unified-diff input. A specially crafted patch can specify an extremely large line number, causing the application to enter an effectively infinite processing loop while attempting to locate the requested position. This results in excessive CPU consumption and prevents the process from completing. An attacker can trigger this behavior by supplying a malicious patch file, causing the utility to become unresponsive and require manual termination. This issue has been fixed in the commit faba04ef4f2b410257f76c1b9dc85e350929c4b9

CVE-2026-56288 Medium · 5.5 CWE-476 Jul 9, 2026

NULL Pointer Dereference in GNU patch

GNU patch is vulnerable to a NULL pointer dereference when processing a specially crafted unified-diff patch file. Improper handling of consecutive end-of-file newline markers can corrupt internal hunk (single block of changes in diff) data structures, causing the application to pass a NULL pointer to fwrite() during patch processing. An attacker can trigger this condition with a malicious patch file, causing the utility to crash and resulting in a denial of service. This issue has been fixed in the commit e6d6a4e021660679d7fc9150f981d4920f722313

CVE-2026-58472 High · 7.1 CWE-190 Jul 7, 2026

GNU Wget 1.25.0 Heap Buffer Overflow via HTML Attribute Encoding

GNU Wget through 1.25.0, fixed in commit dd692d9, contains a heap buffer overflow vulnerability in the html_quote_string() function in src/convert.c that allows a remote attacker to trigger memory corruption by supplying a crafted HTML attribute with a large number of characters requiring entity encoding. A server-supplied HTML attribute causes a signed integer counter to overflow during output size accumulation, resulting in an undersized heap allocation and subsequent heap buffer overflow during the copy phase.

CVE-2026-58471 High · 7.1 CWE-122 Jul 7, 2026

GNU Wget 1.25.0 Heap Buffer Overflow via convert_fname() in url.c

GNU Wget through 1.25.0, fixed in commit c2640fe, contains a heap buffer overflow vulnerability in the convert_fname() function within src/url.c that allows remote attackers to trigger memory corruption through a server-supplied filename requiring character set conversion. When the output buffer is too small during iconv E2BIG reallocation, the reallocation logic miscalculates the remaining space, leading to a heap buffer overflow that can be exploited via a maliciously crafted server response.

CVE-2026-58470 Medium · 5.3 CWE-190 Jul 7, 2026

GNU Wget 1.25.0 Integer Overflow via Content-Range Header Parsing

GNU Wget through 1.25.0, fixed in commit 43d3ba9, contains an integer overflow vulnerability in the parse_content_range() function within src/http.c that allows server-controlled values to cause signed integer arithmetic to overflow. Attackers can supply malicious Content-Range header values to trigger undefined behavior and download desynchronization in the affected client.

CVE-2026-58469 High · 7.5 CWE-125 Jul 7, 2026

GNU Wget 1.25.0 Heap Buffer Underread via Metalink URL Parsing

GNU Wget through 1.25.0, fixed in commit 37a40fc, contains a heap buffer underread vulnerability in the clean_metalink_string() function within src/metalink.c that allows a malicious server to trigger memory corruption by serving a Metalink document containing a whitespace-only URL. Attackers can cause the function to decrement a pointer past the start of the buffer when processing an all-whitespace Metalink URL, potentially leading to abnormal program behavior.

CVE-2026-41992 High · 7.5 CWE-126 Jun 29, 2026

Global Buffer Overflow in GNU gzip

GNU gzip contains a global buffer overflow vulnerability in the LZH decompression logic caused by improper reuse of shared global state between different decompression formats within a single execution. GNU gzip maintains a global array that is shared across the LZ77, LZW, and LZH decompression routines and is not reinitialized between files processed in the same invocation. By decompressing a specially crafted LZW file followed by a specially crafted LZH file in a single gzip -d command, an attacker can poison the shared global state and subsequently trigger an out‑of‑bounds read in the LZH decoder. The LZH decompression logic follows stale values left in the shared array, causing reads past the end of the allocated global buffer. This issue has been fixed in commits 63dbf6b3b9e6e781df1a6a64e609b10e23969681 and e7378c2d421be6a286922374425680bbe9ad8b7d.

CVE-2026-41991 Medium · 4.7 CWE-377 Jun 29, 2026

Predictable Temporary File in GNU gzip

GNU gzip contains a vulnerability in the gzexe utility related to insecure temporary file handling. When the mktemp utility is not available in the user’s PATH, gzexe falls back to constructing a temporary file path based solely on the process ID (PID). This predictable filename is created without exclusive access or existence checks. A local attacker can pre‑create the predicted temporary file path as a symbolic link pointing to an arbitrary file writable by the victim. When gzexe runs, it follows the symlink and overwrites the target file, resulting in a time‑of‑check to time‑of‑use (TOCTOU) condition that allows arbitrary file overwrite. This issue has been fixed in the commit 4e6f8b24ab823146ab8776f0b7fe486ab34d4269

CVE-2026-9155 High · 8.8 CWE-78 Jun 24, 2026

OS Command Injection in Rapid7 InsightConnect Sed Plugin via expression parameter.

OS Command Injection vulnerability in Rapid7 InsightConnect Sed Plugin on Linux allows authenticated attackers to execute arbitrary OS commands via the expression parameter due to insufficient input validation.

CVE-2026-9154 Medium · 6.5 CWE-22 Jun 24, 2026

Arbitrary File Write in Rapid7 InsightConnect Sed Plugin

Arbitrary File Write vulnerability in Rapid7 InsightConnect Sed Plugin on Linux allows authenticated attackers to write attacker-controlled content to arbitrary file paths via the expression parameter.

CVE-2026-9153 Medium · 6.5 CWE-22 Jun 24, 2026

Arbitrary File Read in Rapid7 InsightConnect Sed Plugin

Arbitrary File Read vulnerability in Rapid7 InsightConnect Sed Plugin on Linux allows authenticated attackers to read arbitrary files via the expression parameter due to insufficient input validation.

CVE-2026-57053 Low · 2.5 CWE-1284 Jun 23, 2026

GNU libidn before 1.44 is prone to out-of-bounds reads of uninitialized memory in the…

GNU libidn before 1.44 is prone to out-of-bounds reads of uninitialized memory in the ToUnicode APIs because of mishandling in idna_to_unicode_internal. The affected code is not present in libidn2.

CVE-2026-56968 Medium · 5.3 CWE-908 Jun 23, 2026

Use of Uninitialized Resource in Gnu Sasl

GNU SASL before 2.2.4 lacks sanitization of a short challenge in _gsasl_ntlm_client_step in the NTLM client, which could result in memory disclosure via a crafted server.

CVE-2026-56355 Low · 3.7 CWE-696 Jun 20, 2026

GNU Savannah Administration Savane through 3.17 uses untrusted data as part of…

GNU Savannah Administration Savane through 3.17 uses untrusted data as part of authorization.

CVE-2026-9605 High · 7.3 CWE-119 May 26, 2026

GNU libredwg Dwgbmp Utility bits.c bit_read_RC heap-based overflow

A flaw has been found in GNU libredwg up to 0.13.4.8160. This issue affects the function bit_read_RC of the file bits.c of the component Dwgbmp Utility. This manipulation causes heap-based buffer overflow. The attack is possible to be carried out remotely. The exploit has been published and may be used. Patch name: 8f03865f37f5d4ffd616fef802acc980be54d300. Applying a patch is the recommended action to fix this issue.

CVE-2026-9530 Low · 3.3 CWE-119 May 26, 2026

GNU LibreDWG Dwgbmp Utility decode.c read_2004_compressed_section out-of-bounds

A weakness has been identified in GNU LibreDWG up to 0.14. The impacted element is the function read_2004_compressed_section of the file src/decode.c of the component Dwgbmp Utility. Executing a manipulation can lead to out-of-bounds read. The attack requires local access. The exploit has been made available to the public and could be used for attacks. This patch is called 8f03865f37f5d4ffd616fef802acc980be54d300. It is advisable to implement a patch to correct this issue.

CVE-2026-9529 Low · 3.3 CWE-404 May 26, 2026

GNU LibreDWG Dwggrep Utility dwggrep.c match_BLOCK_HEADER null pointer dereference

A security flaw has been discovered in GNU LibreDWG up to 0.14. The affected element is the function match_BLOCK_HEADER of the file dwggrep.c of the component Dwggrep Utility. Performing a manipulation results in null pointer dereference. The attack requires a local approach. The exploit has been released to the public and may be used for attacks.