Vulnerability database
Every flaw the U.S. government’s cybersecurity agency (CISA) has confirmed attackers are using, plus the new WordPress plugin and theme bugs published each day, sorted by what they mean for a small business. We refresh it twice a day. If you see something your website or office runs, tell us.
18 results
May 10, 2026In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, a mismatch between encoding lists in Oniguruma and mbfl lCVE-2026-7259 · Websites & servers · PHP Group · reported by security@php.netLow 2.1
In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, a mismatch between encoding lists in Oniguruma and mbfl leads to a NULL pointer dereference, resulting in a segmentation fault and denial of service. The vulnerability is exploitable when user-controlled input can influence the encoding passed to mb_regex_encoding().
- Product
- PHP
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Mar 24, 2026Out-of-bounds Read vulnerability in rizonesoft Notepad3 (scintilla/oniguruma/src modules).CVE-2026-4744 · Other software · rizonesoft · reported by cve_disclosure@tech.gov.sgCritical 9.3
Out-of-bounds Read vulnerability in rizonesoft Notepad3 (scintilla/oniguruma/src modules). This vulnerability is associated with program files regcomp.C. This issue affects Notepad3: before 6.25.714.1.
- Product
- Notepad3
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jan 27, 2026Out-of-bounds Read vulnerability in CloverHackyColor CloverBootloader (MdeModulePkg/Universal/RegularExpressionDxe/Oniguruma modules).CVE-2026-24796 · Other software · CloverHackyColor · reported by cve_disclosure@tech.gov.sgMedium 6.9
Out-of-bounds Read vulnerability in CloverHackyColor CloverBootloader (MdeModulePkg/Universal/RegularExpressionDxe/Oniguruma modules). This vulnerability is associated with program files regparse.C. This issue affects CloverBootloader: before 5162.
- Product
- CloverBootloader
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jan 27, 2026Out-of-bounds Write vulnerability in CloverHackyColor CloverBootloader (MdeModulePkg/Universal/RegularExpressionDxe/Oniguruma modules).CVE-2026-24795 · Other software · CloverHackyColor · reported by cve_disclosure@tech.gov.sgMedium 5.1
Out-of-bounds Write vulnerability in CloverHackyColor CloverBootloader (MdeModulePkg/Universal/RegularExpressionDxe/Oniguruma modules). This vulnerability is associated with program files regcomp.C. This issue affects CloverBootloader: before 5162.
- Product
- CloverBootloader
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Nov 25, 2019Oniguruma through 6.9.3, as used in PHP 7.3.x and other products, has a heap-based buffer over-read in str_lower_case_match in regexec.c.CVE-2019-19246 · Other software · Oniguruma Project · reported by MITREHigh 7.5
Oniguruma through 6.9.3, as used in PHP 7.3.x and other products, has a heap-based buffer over-read in str_lower_case_match in regexec.c.
- Product
- Oniguruma
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordbugs.php.netgithub.com
Nov 21, 2019An issue was discovered in Oniguruma 6.x before 6.9.4_rc2.CVE-2019-19204 · Other software · Oniguruma Project · reported by MITREHigh 7.5
An issue was discovered in Oniguruma 6.x before 6.9.4_rc2. In the function fetch_interval_quantifier (formerly known as fetch_range_quantifier) in regparse.c, PFETCH is called without checking PEND. This leads to a heap-based buffer over-read.
- Product
- Oniguruma
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Nov 21, 2019An issue was discovered in Oniguruma 6.x before 6.9.4_rc2.CVE-2019-19203 · Other software · Oniguruma Project · reported by MITREHigh 7.5
An issue was discovered in Oniguruma 6.x before 6.9.4_rc2. In the function gb18030_mbc_enc_len in file gb18030.c, a UChar pointer is dereferenced without checking if it passed the end of the matched string. This leads to a heap-based buffer over-read.
- Product
- Oniguruma
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Nov 17, 2019An integer overflow in the search_in_range function in regexec.c in Oniguruma 6.x before 6.9.4_rc2 leads to an out-of-bounds read, in which the offset of this rCVE-2019-19012 · Other software · Oniguruma Project · reported by MITRECritical 9.8
An integer overflow in the search_in_range function in regexec.c in Oniguruma 6.x before 6.9.4_rc2 leads to an out-of-bounds read, in which the offset of this read is under the control of an attacker. (This only affects the 32-bit compiled version). Remote attackers can cause a denial-of-service or information disclosure, or possibly have unspecified other impact, via a crafted regular expression.
- Product
- Oniguruma
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Sep 9, 2019Oniguruma before 6.9.3 allows Stack Exhaustion in regcomp.c because of recursion in regparse.c.CVE-2019-16163 · Other software · Oniguruma Project · reported by MITREHigh 7.5
Oniguruma before 6.9.3 allows Stack Exhaustion in regcomp.c because of recursion in regparse.c.
- Product
- Oniguruma
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jul 10, 2019A NULL Pointer Dereference in match_at() in regexec.c in Oniguruma 6.9.2 allows attackers to potentially cause denial of service by providing a crafted regular CVE-2019-13225 · Other software · Oniguruma Project · reported by MITREMedium 6.5
A NULL Pointer Dereference in match_at() in regexec.c in Oniguruma 6.9.2 allows attackers to potentially cause denial of service by providing a crafted regular expression. Oniguruma issues often affect Ruby, as well as common optional libraries for PHP and Rust.
- Product
- Oniguruma
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordgithub.comlists.fedoraproject.org
Jul 10, 2019A use-after-free in onig_new_deluxe() in regext.c in Oniguruma 6.9.2 allows attackers to potentially cause information disclosure, denial of service, or possiblCVE-2019-13224 · Other software · Oniguruma Project · reported by MITRECritical 9.8
A use-after-free in onig_new_deluxe() in regext.c in Oniguruma 6.9.2 allows attackers to potentially cause information disclosure, denial of service, or possibly code execution by providing a crafted regular expression. The attacker provides a pair of a regex pattern and a string, with a multi-byte encoding that gets handled by onig_new_deluxe(). Oniguruma issues often affect Ruby, as well as common optional libraries for PHP and Rust.
- Product
- Oniguruma
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordgithub.comlists.debian.org
May 24, 2017An issue was discovered in Oniguruma 6.2.0, as used in Oniguruma-mod in Ruby through 2.4.1 and mbstring in PHP through 7.1.5.CVE-2017-9229 · Other software · Oniguruma Project · reported by MITREHigh 7.5
An issue was discovered in Oniguruma 6.2.0, as used in Oniguruma-mod in Ruby through 2.4.1 and mbstring in PHP through 7.1.5. A SIGSEGV occurs in left_adjust_char_head() during regular expression compilation. Invalid handling of reg->dmax in forward_search_range() could result in an invalid pointer dereference, normally as an immediate denial-of-service condition.
- Product
- Oniguruma
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordaccess.redhat.comgithub.com
May 24, 2017An issue was discovered in Oniguruma 6.2.0, as used in Oniguruma-mod in Ruby through 2.4.1 and mbstring in PHP through 7.1.5.CVE-2017-9228 · Other software · Oniguruma Project · reported by MITRECritical 9.8
An issue was discovered in Oniguruma 6.2.0, as used in Oniguruma-mod in Ruby through 2.4.1 and mbstring in PHP through 7.1.5. A heap out-of-bounds write occurs in bitset_set_range() during regular expression compilation due to an uninitialized variable from an incorrect state transition. An incorrect state transition in parse_char_class() could create an execution path that leaves a critical local variable uninitialized until it's used as an index, resulting in an out-of-bounds write memory corruption.
- Product
- Oniguruma
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordaccess.redhat.comgithub.com
May 24, 2017An issue was discovered in Oniguruma 6.2.0, as used in Oniguruma-mod in Ruby through 2.4.1 and mbstring in PHP through 7.1.5.CVE-2017-9227 · Other software · Oniguruma Project · reported by MITRECritical 9.8
An issue was discovered in Oniguruma 6.2.0, as used in Oniguruma-mod in Ruby through 2.4.1 and mbstring in PHP through 7.1.5. A stack out-of-bounds read occurs in mbc_enc_len() during regular expression searching. Invalid handling of reg->dmin in forward_search_range() could result in an invalid pointer dereference, as an out-of-bounds read from a stack buffer.
- Product
- Oniguruma
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordsecurityfocus.comaccess.redhat.com
May 24, 2017An issue was discovered in Oniguruma 6.2.0, as used in Oniguruma-mod in Ruby through 2.4.1 and mbstring in PHP through 7.1.5.CVE-2017-9226 · Other software · Oniguruma Project · reported by MITRECritical 9.8
An issue was discovered in Oniguruma 6.2.0, as used in Oniguruma-mod in Ruby through 2.4.1 and mbstring in PHP through 7.1.5. A heap out-of-bounds write or read occurs in next_state_val() during regular expression compilation. Octal numbers larger than 0xff are not handled correctly in fetch_token() and fetch_token_in_cc(). A malformed regular expression containing an octal number in the form of '\700' would produce an invalid code point value larger than 0xff in next_state_val(), resulting in an out-of-bounds write memory corruption.
- Product
- Oniguruma
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordsecurityfocus.comaccess.redhat.com
May 24, 2017An issue was discovered in Oniguruma 6.2.0, as used in Oniguruma-mod in Ruby through 2.4.1 and mbstring in PHP through 7.1.5.CVE-2017-9225 · Other software · Oniguruma Project · reported by MITRECritical 9.8
An issue was discovered in Oniguruma 6.2.0, as used in Oniguruma-mod in Ruby through 2.4.1 and mbstring in PHP through 7.1.5. A stack out-of-bounds write in onigenc_unicode_get_case_fold_codes_by_str() occurs during regular expression compilation. Code point 0xFFFFFFFF is not properly handled in unicode_unfold_key(). A malformed regular expression could result in 4 bytes being written off the end of a stack buffer of expand_case_fold_string() during the call to onigenc_unicode_get_case_fold_codes_by_str(), a typical stack buffer overflow.
- Product
- Oniguruma
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
May 24, 2017An issue was discovered in Oniguruma 6.2.0, as used in Oniguruma-mod in Ruby through 2.4.1 and mbstring in PHP through 7.1.5.CVE-2017-9224 · Other software · Oniguruma Project · reported by MITRECritical 9.8
An issue was discovered in Oniguruma 6.2.0, as used in Oniguruma-mod in Ruby through 2.4.1 and mbstring in PHP through 7.1.5. A stack out-of-bounds read occurs in match_at() during regular expression searching. A logical error involving order of validation and access in match_at() could result in an out-of-bounds read from a stack buffer.
- Product
- Oniguruma
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordsecurityfocus.comaccess.redhat.com
Apr 3, 2017The parse_char_class function in regparse.c in the Onigmo (aka Oniguruma-mod) regular expression library, as used in Ruby 2.4.0, allows remote attackers to causCVE-2017-6181 · Other software · Ruby-lang · reported by MITREHigh 7.5
The parse_char_class function in regparse.c in the Onigmo (aka Oniguruma-mod) regular expression library, as used in Ruby 2.4.0, allows remote attackers to cause a denial of service (deep recursion and application crash) via a crafted regular expression.
- Product
- Ruby
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordsecurityfocus.combugs.ruby-lang.org
Where this comes from: the exploited list is CISA’s Known Exploited Vulnerabilities catalog. Everything else is the whole National Vulnerability Database, where each record is published by the team that found the bug (Wordfence, Patchstack, WPScan, the vendors themselves and others); we show who. Exploit odds are FIRST’s EPSS, updated daily. Titles and categories are ours, so check the linked record before acting on a detail. For a write-up of the big ones, see our advisories. Every vendor, and every WordPress plugin and theme with a recorded flaw, also has its own page. All of it is free to reuse as JSON, CSV or RSS.
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