CVE-2020-27618

glibc: iconv when processing invalid multi-byte input sequences fails to advance the input state, which could result in an infinite loop

The iconv function in the GNU C Library (aka glibc or libc6) 2.32 and earlier, when processing invalid multi-byte input sequences in IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 encodings, fails to advance the input state, which could lead to an infinite loop in applications, resulting in a denial of service, a different vulnerability from CVE-2016-10228.

CVSS 3.1 · 5.5 Medium EPSS < 1% KEV · Not listed

Vendors

Debian Gnu Netapp and 2 more

Products

Debian Linux Glibc 500f and 22 more

CVE-2020-6096

glibc: signed comparison vulnerability in the ARMv7 memcpy function

An exploitable signed comparison vulnerability exists in the ARMv7 memcpy() implementation of GNU glibc 2.30.9000. Calling memcpy() (on ARMv7 targets that utilize the GNU glibc implementation) with a negative value for the 'num' parameter results in a signed comparison vulnerability. If an attacker underflows the 'num' parameter to memcpy(), this vulnerability could lead to undefined behavior such as writing to out-of-bounds memory and potentially remote code execution. Furthermore, this memcpy() implementation allows for program execution to continue in scenarios where a segmentation fault or crash should have occurred. The dangers occur in that subsequent execution and iterations of this code will be executed with this corrupted data.

CVSS 3.1 · 8.1 High EPSS 5.5% KEV · Not listed

Vendors

Debian Fedoraproject Gnu

Products

Debian Linux Fedora Glibc

CVE-2020-1752

glibc: use-after-free in glob() function when expanding ~user

A use-after-free vulnerability introduced in glibc upstream version 2.14 was found in the way the tilde expansion was carried out. Directory paths containing an initial tilde followed by a valid username were affected by this issue. A local attacker could exploit this flaw by creating a specially crafted path that, when processed by the glob function, would potentially lead to arbitrary code execution. This was fixed in version 2.32.

CVSS 3.1 · 7 High EPSS < 1% KEV · Not listed

Vendors

Canonical Debian Gnu and 2 more

Products

Ubuntu Linux Debian Linux Glibc and 7 more

CVE-2020-1751

glibc: array overflow in backtrace functions for powerpc

An out-of-bounds write vulnerability was found in glibc before 2.31 when handling signal trampolines on PowerPC. Specifically, the backtrace function did not properly check the array bounds when storing the frame address, resulting in a denial of service or potential code execution. The highest threat from this vulnerability is to system availability.

CVSS 3.1 · 5.1 Medium EPSS < 1% KEV · Not listed

Vendors

Canonical Gnu Redhat

Products

Ubuntu Linux Glibc Enterprise Linux

CVE-2020-10029

glibc: stack corruption from crafted input in cosl, sinl, sincosl, and tanl functions

The GNU C Library (aka glibc or libc6) before 2.32 could overflow an on-stack buffer during range reduction if an input to an 80-bit long double function contains a non-canonical bit pattern, a seen when passing a 0x5d414141414141410000 value to sinl on x86 targets. This is related to sysdeps/ieee754/ldbl-96/e_rem_pio2l.c.

CVSS 3.1 · 5.5 Medium EPSS < 1% KEV · Not listed

Vendors

Canonical Debian Fedoraproject and 4 more

Products

Ubuntu Linux Debian Linux Fedora and 15 more

CVE-2019-25013

glibc: buffer over-read in iconv when processing invalid multi-byte input sequences in the EUC-KR encoding

The iconv feature in the GNU C Library (aka glibc or libc6) through 2.32, when processing invalid multi-byte input sequences in the EUC-KR encoding, may have a buffer over-read.

CVSS 3.1 · 5.9 Medium EPSS 3.6% KEV · Not listed

Vendors

Broadcom Debian Fedoraproject and 3 more

Products

Fabric Operating System Debian Linux Fedora and 9 more

CVE-2019-1010025

glibc: information disclosure of heap addresses of pthread_created thread

GNU Libc current is affected by: Mitigation bypass. The impact is: Attacker may guess the heap addresses of pthread_created thread. The component is: glibc. NOTE: the vendor's position is "ASLR bypass itself is not a vulnerability.

CVSS 3.0 · 5.3 Medium EPSS 2.5% KEV · Not listed

Vendors

Gnu

Products

Glibc

CVE-2019-1010024

glibc: ASLR bypass using cache of thread stack and heap

GNU Libc current is affected by: Mitigation bypass. The impact is: Attacker may bypass ASLR using cache of thread stack and heap. The component is: glibc. NOTE: Upstream comments indicate "this is being treated as a non-security bug and no real threat.

CVSS 3.0 · 5.3 Medium EPSS 3.2% KEV · Not listed

Vendors

Gnu

Products

Glibc

CVE-2019-1010023

glibc: running ldd on malicious ELF leads to code execution because of wrong size computation

GNU Libc current is affected by: Re-mapping current loaded library with malicious ELF file. The impact is: In worst case attacker may evaluate privileges. The component is: libld. The attack vector is: Attacker sends 2 ELF files to victim and asks to run ldd on it. ldd execute code. NOTE: Upstream comments indicate "this is being treated as a non-security bug and no real threat.

CVSS 3.1 · 5.4 Medium EPSS 3.1% KEV · Not listed

Vendors

Gnu

Products

Glibc

CVE-2019-1010022

glibc: stack guard protection bypass

GNU Libc current is affected by: Mitigation bypass. The impact is: Attacker may bypass stack guard protection. The component is: nptl. The attack vector is: Exploit stack buffer overflow vulnerability and use this bypass vulnerability to bypass stack guard. NOTE: Upstream comments indicate "this is being treated as a non-security bug and no real threat.

CVSS 3.0 · 9.8 Critical EPSS 3.2% KEV · Not listed

Vendors

Gnu

Products

Glibc

CVE-2019-9169

glibc: regular-expression match via proceed_next_node in posix/regexec.c leads to heap-based buffer over-read

In the GNU C Library (aka glibc or libc6) through 2.29, proceed_next_node in posix/regexec.c has a heap-based buffer over-read via an attempted case-insensitive regular-expression match.

CVSS 3.1 · 9.8 Critical EPSS 4.7% KEV · Not listed

Vendors

Canonical Gnu Mcafee and 2 more

Products

Ubuntu Linux Glibc Web Gateway and 4 more

CVE-2019-7309

glibc: memcmp function incorrectly returns zero

In the GNU C Library (aka glibc or libc6) through 2.29, the memcmp function for the x32 architecture can incorrectly return zero (indicating that the inputs are equal) because the RDX most significant bit is mishandled.

CVSS 3.0 · 5.5 Medium EPSS < 1% KEV · Not listed

Vendors

Gnu

Products

Glibc

CVE-2019-6488

glibc: Incorrect attempt to use a 64-bit register for size_t in assembly codes results in segmentation fault

The string component in the GNU C Library (aka glibc or libc6) through 2.28, when running on the x32 architecture, incorrectly attempts to use a 64-bit register for size_t in assembly codes, which can lead to a segmentation fault or possibly unspecified other impact, as demonstrated by a crash in __memmove_avx_unaligned_erms in sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S during a memcpy.

CVSS 3.0 · 7.8 High EPSS < 1% KEV · Not listed

Vendors

Gnu

Products

Glibc

CVE-2019-19126

glibc: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid binaries

On the x86-64 architecture, the GNU C Library (aka glibc) before 2.31 fails to ignore the LD_PREFER_MAP_32BIT_EXEC environment variable during program execution after a security transition, allowing local attackers to restrict the possible mapping addresses for loaded libraries and thus bypass ASLR for a setuid program.

CVSS 3.1 · 3.3 Low EPSS < 1% KEV · Not listed

Vendors

Canonical Debian Fedoraproject and 2 more

Products

Ubuntu Linux Debian Linux Fedora and 3 more

CVE-2018-19591

glibc: file descriptor leak in if_nametoindex() in sysdeps/unix/sysv/linux/if_index.c

In the GNU C Library (aka glibc or libc6) through 2.28, attempting to resolve a crafted hostname via getaddrinfo() leads to the allocation of a socket descriptor that is not closed. This is related to the if_nametoindex() function.

CVSS 3.1 · 7.5 High EPSS 5.5% KEV · Not listed

Vendors

Fedoraproject Gnu

Products

Fedora Glibc

CVE-2016-10739

glibc: getaddrinfo should reject IP addresses with trailing characters

In the GNU C Library (aka glibc or libc6) through 2.28, the getaddrinfo function would successfully parse a string that contained an IPv4 address followed by whitespace and arbitrary characters, which could lead applications to incorrectly assume that it had parsed a valid string, without the possibility of embedded HTTP headers or other potentially dangerous substrings.

CVSS 3.0 · 5.3 Medium EPSS < 1% KEV · Not listed

Vendors

Gnu Opensuse Redhat

Products

Glibc Leap Ansible Tower and 1 more

CVE-2016-10228

glibc: iconv program can hang when invoked with the -c option

The iconv program in the GNU C Library (aka glibc or libc6) 2.31 and earlier, when invoked with multiple suffixes in the destination encoding (TRANSLATE or IGNORE) along with the -c option, enters an infinite loop when processing invalid multi-byte input sequences, leading to a denial of service.

CVSS 3.0 · 5.9 Medium EPSS 4.1% KEV · Not listed

Vendors

Gnu Redhat

Products

Glibc Enterprise Linux

CVE-2026-80489

EUC_JISX0213 decoding may hang on crafted input

Converting crafted EUC_JISX0213 input to UCS-4 or the internal wide character encoding, for example with iconv, in the GNU C Library version 2.3 to 2.44 may result in the converter making no progress, causing the calling application to hang. Some EUC_JISX0213 sequences decode to two code points. If the output buffer has room for only the first one, the converter stores the second in the conversion state and returns E2BIG, but it never clears that pending character after emitting it on the next call. The converter then keeps emitting the pending character without consuming further input, so an application that retries the conversion loops forever. The input must be attacker controlled and the application must convert it with an output buffer small enough to split the two code points. Only the EUC_JISX0213 character set is affected, which is not commonly used. The related defect in SHIFT_JISX0213 converter is tracked separately as CVE-2026-77117.

CVSS 3.1 · 5.9 Medium EPSS < 1% KEV · Not listed

Vendors

Gnu

Products

Glibc

CVE-2026-77117

SHIFT_JISX0213 decoding may hang on crafted input

Converting crafted SHIFT_JISX0213 input to UCS-4 or the internal wide character encoding, for example with iconv, in the GNU C Library version 2.3 to 2.44 may result in the converter making no progress, causing the calling application to hang. Some SHIFT_JISX0213 sequences decode to two code points. If the output buffer has room for only the first one, the converter stores the second in the conversion state and returns E2BIG, but it never clears that pending character after emitting it on the next call. The converter then keeps emitting the pending character without consuming further input, so an application that retries the conversion loops forever. The input must be attacker controlled and the application must convert it with an output buffer small enough to split the two code points. Only the SHIFT_JISX0213 character set is affected, which is not commonly used. The related defect in the EUC_JISX0213 converter is tracked separately as CVE-2026-80489.

CVSS 3.1 · 5.9 Medium EPSS < 1% KEV · Not listed

Vendors

Gnu

Products

Glibc

CVE-2026-19542

Stack-based out-of-bounds write in tdelete during tree rebalancing

Calling tdelete on a sufficiently deep tree in the GNU C Library version 2.1 to 2.44 may write one pointer past the end of an alloca-allocated array on the stack, which may crash the application. The tdelete implementation keeps an explicit stack of parent nodes for rebalancing, which is grown as needed while descending the tree. Two rebalancing branches push an additional entry without checking the capacity, and write past the array when the stack is exactly full. Triggering this requires a node at a depth of exactly 40 (or 40 plus a multiple of 20), which implies a tree with at least a million nodes, so an attacker must drive a large number of insertions and deletions through an application that uses tsearch and tdelete. The written value is a pointer into a tree node and is not directly attacker controlled. No affected application in common distributions has been identified.

CVSS 3.1 · 5.6 Medium EPSS < 1% KEV · Not listed

Vendors

Gnu

Products

Glibc