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    CVE-2009-5155

    In the GNU C Library (aka glibc or libc6) before 2.28, parse_reg_exp in posix/regcomp.c misparses alternatives, which allows attackers to cause a denial of service (assertion failure and application exit) or trigger an incorrect result by attempting a regular-expression match.

    Published:Feb 26, 2019
    Last Modified:Nov 21, 2024
    EPS:Feb 26, 2019
    EPSS Score:0.01374
    CVSS Score:7.5

    Affected Products

    Vendor
    Gnu
    Product
    Glibc
    Vendor
    Netapp
    Product
    Cloud Backup
    Vendor
    Netapp
    Product
    Ontap Select Deploy Administration Utility
    Vendor
    Netapp
    Product
    Steelstore Cloud Integrated Storage

    Exploits

    https://debbugs.gnu.org/cgi/bugreport.cgi?bug=32806https://debbugs.gnu.org/cgi/bugreport.cgi?bug=34238https://sourceware.org/bugzilla/show_bug.cgi?id=11053https://sourceware.org/bugzilla/show_bug.cgi?id=18986https://debbugs.gnu.org/cgi/bugreport.cgi?bug=32806https://debbugs.gnu.org/cgi/bugreport.cgi?bug=34238https://sourceware.org/bugzilla/show_bug.cgi?id=11053https://sourceware.org/bugzilla/show_bug.cgi?id=18986

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-10 Buffer Overflow via Environment Variables
    CAPEC-101 Server Side Include (SSI) Injection
    CAPEC-104 Cross Zone Scripting
    CAPEC-108 Command Line Execution through SQL Injection
    CAPEC-109 Object Relational Mapping Injection
    CAPEC-110 SQL Injection through SOAP Parameter Tampering
    CAPEC-120 Double Encoding
    CAPEC-13 Subverting Environment Variable Values
    CAPEC-135 Format String Injection
    CAPEC-136 LDAP Injection
    CAPEC-14 Client-side Injection-induced Buffer Overflow
    CAPEC-15 Command Delimiters
    CAPEC-153 Input Data Manipulation
    CAPEC-182 Flash Injection
    CAPEC-209 XSS Using MIME Type Mismatch
    CAPEC-22 Exploiting Trust in Client
    CAPEC-23 File Content Injection
    CAPEC-230 Serialized Data with Nested Payloads
    CAPEC-231 Oversized Serialized Data Payloads
    CAPEC-24 Filter Failure through Buffer Overflow
    CAPEC-250 XML Injection
    CAPEC-261 Fuzzing for garnering other adjacent user/sensitive data
    CAPEC-267 Leverage Alternate Encoding
    CAPEC-28 Fuzzing
    CAPEC-3 Using Leading 'Ghost' Character Sequences to Bypass Input Filters
    CAPEC-31 Accessing/Intercepting/Modifying HTTP Cookies
    CAPEC-42 MIME Conversion
    CAPEC-43 Exploiting Multiple Input Interpretation Layers
    CAPEC-45 Buffer Overflow via Symbolic Links
    CAPEC-46 Overflow Variables and Tags
    CAPEC-47 Buffer Overflow via Parameter Expansion
    CAPEC-473 Signature Spoof
    CAPEC-52 Embedding NULL Bytes
    CAPEC-53 Postfix, Null Terminate, and Backslash
    CAPEC-588 DOM-Based XSS
    CAPEC-6 Argument Injection
    CAPEC-63 Cross-Site Scripting (XSS)
    CAPEC-64 Using Slashes and URL Encoding Combined to Bypass Validation Logic
    CAPEC-664 Server Side Request Forgery
    CAPEC-67 String Format Overflow in syslog()
    CAPEC-7 Blind SQL Injection
    CAPEC-71 Using Unicode Encoding to Bypass Validation Logic
    CAPEC-72 URL Encoding
    CAPEC-73 User-Controlled Filename
    CAPEC-78 Using Escaped Slashes in Alternate Encoding
    CAPEC-79 Using Slashes in Alternate Encoding
    CAPEC-8 Buffer Overflow in an API Call
    CAPEC-80 Using UTF-8 Encoding to Bypass Validation Logic
    CAPEC-81 Web Server Logs Tampering
    CAPEC-83 XPath Injection
    CAPEC-85 AJAX Footprinting
    CAPEC-88 OS Command Injection
    CAPEC-9 Buffer Overflow in Local Command-Line Utilities

    Related CVEs

    CVE-2026-80489 (CVSS 5.9) — A flaw was found in glibc. This vulnerability allows a remote attacker to cause a denial of service (DoS) by p…
    CVE-2026-77117 (CVSS 5.9) — A flaw was found in glibc. A remote attacker could exploit this vulnerability by providing specially crafted i…
    CVE-2026-19499 (CVSS 6.8) — A flaw was found in glibc. The strfmon and strfmon_l functions are vulnerable to a buffer overflow when proces…
    CVE-2026-19542 (CVSS 4.2) — A flaw was found in glibc. An out-of-bounds array write vulnerability exists within the `tdelete` function. Th…
    CVE-2026-6368 (CVSS 2.1) — Calling wordexp with WRDE_APPEND in the GNU C Library version 2.0 to version 2.43 can cause the interface to r…
    CVE-2026-6238 (CVSS 6.5) — The deprecated functions ns_printrrf, ns_printrr and fp_nquery in the GNU C Library version 2.0.1 to version 2…
    CVE-2026-5435 (CVSS 7.3) — The deprecated functions ns_printrrf, ns_printrr and fp_nquery in the GNU C Library version 2.2 and newer fail…
    CVE-2026-5450 (CVSS 9.8) — Calling the scanf family of functions with a %mc (malloc'd character match) in the GNU C Library version 2.7 t…
    CVE-2026-5928 (CVSS 7.5) — Calling the ungetwc function on a FILE stream with wide characters encoded in a character set that has overlap…
    CVE-2026-4046 (CVSS 7.5) — The iconv() function in the GNU C Library versions 2.43 and earlier may crash due to an assertion failure when…

    References

    http://git.savannah.gnu.org/cgit/gnulib.git/commit/?id=5513b40999149090987a0341c018d05d3eea1272
    https://debbugs.gnu.org/cgi/bugreport.cgi?bug=22793
    https://debbugs.gnu.org/cgi/bugreport.cgi?bug=32806
    https://debbugs.gnu.org/cgi/bugreport.cgi?bug=34238
    https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
    https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
    https://security.netapp.com/advisory/ntap-20190315-0002/
    https://sourceware.org/bugzilla/show_bug.cgi?id=11053
    https://sourceware.org/bugzilla/show_bug.cgi?id=18986
    https://sourceware.org/git/gitweb.cgi?p=glibc.git%3Bh=eb04c21373e2a2885f3d52ff192b0499afe3c672
    https://support.f5.com/csp/article/K64119434
    https://support.f5.com/csp/article/K64119434?utm_source=f5support&amp%3Butm_medium=RSS
    http://git.savannah.gnu.org/cgit/gnulib.git/commit/?id=5513b40999149090987a0341c018d05d3eea1272
    https://debbugs.gnu.org/cgi/bugreport.cgi?bug=22793
    https://debbugs.gnu.org/cgi/bugreport.cgi?bug=32806
    https://debbugs.gnu.org/cgi/bugreport.cgi?bug=34238
    https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
    https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
    https://security.netapp.com/advisory/ntap-20190315-0002/
    https://sourceware.org/bugzilla/show_bug.cgi?id=11053
    https://sourceware.org/bugzilla/show_bug.cgi?id=18986
    https://sourceware.org/git/gitweb.cgi?p=glibc.git%3Bh=eb04c21373e2a2885f3d52ff192b0499afe3c672
    https://support.f5.com/csp/article/K64119434
    https://support.f5.com/csp/article/K64119434?utm_source=f5support&amp%3Butm_medium=RSS

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High