Common Weakness Enumeration
CWE-193
AllowedOff-by-one Error
Abstraction: Base · Status: Draft
A product calculates or uses an incorrect maximum or minimum value that is 1 more, or 1 less, than the correct value.
273 vulnerabilities reference this CWE, most recent first.
CVE-2026-71391 (GCVE-0-2026-71391)
Vulnerability from cvelistv5 – Published: 2026-08-10 10:22 – Updated: 2026-08-10 17:48 X_Open Source
VLAI
EPSS
VEX
Title
Off-by-One Error in GNU Emacs for Android
Summary
GNU Emacs for Android contains an off-by-one error in the gvar table parser in src/sfnt.c. The shared-coordinate index boundary check in sfnt_vary_simple_glyph() and sfnt_vary_compound_glyph() uses a strict greater-than comparison instead of greater-than-or-equal, allowing a crafted TrueType variable font to bypass the check and trigger a heap-based out-of-bounds read via memcpy. An attacker can deliver a malicious font file via email, EWW (Emacs Web Wowser), or documents with custom faces, causing Emacs to load it. This exposes heap memory contents which can be later used to defeat ASLR.
This issue was fixed in commit 95ab9ef627b212d74d321c5bbb5b56a1be7b9fbe
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-10 17:48 UTC
CWE
- CWE-193 - Off-by-one Error
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://cert.pl/en/posts/2026/08/CVE-2026-71391 | third-party-advisory |
| https://www.gnu.org/savannah-checkouts/gnu/emacs/… | product |
| https://git.savannah.gnu.org/cgit/emacs.git/commi… |
Impacted products
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CVE-2026-68767 (GCVE-0-2026-68767)
Vulnerability from cvelistv5 – Published: 2026-08-22 14:12 – Updated: 2026-08-22 14:12
VLAI
EPSS
VEX
Title
hashcat through 7.1.2 Off-by-One Out-of-Bounds Heap Write in fgetl()
Summary
hashcat's fgetl() function in src/filehandling.c writes a null terminator one byte past the caller's buffer when an input line is exactly the buffer length. Attackers can trigger this out-of-bounds heap write by providing a hash file, potfile, or wordlist containing a line of exactly HCBUFSIZ_LARGE bytes.
Severity
6.1 (Medium)
CWE
- CWE-193 - Off-by-one Error
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/hashcat/hashcat/issues/4739 | issue-tracking |
| https://github.com/hashcat/hashcat | product |
| https://github.com/hashcat/hashcat/commit/93b55d3… | patch |
| https://github.com/hashcat/hashcat/blob/v7.1.2/sr… | technical-description |
| https://www.vulncheck.com/advisories/hashcat-thro… | third-party-advisory |
Impacted products
Date Public
2026-07-31 00:00
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CVE-2026-66806 (GCVE-0-2026-66806)
Vulnerability from cvelistv5 – Published: 2026-08-11 17:07 – Updated: 2026-08-25 22:48
VLAI
EPSS
VEX
Title
Microsoft Office Word Information Disclosure Vulnerability
Summary
Off-by-one error in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-11 21:00 UTC
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://msrc.microsoft.com/update-guide/vulnerabi… | vendor-advisorypatch |
Impacted products
5 products
| Vendor | Product | Version | |
|---|---|---|---|
| Microsoft | Microsoft 365 Apps for Enterprise |
Affected:
16.0.1 , < https://aka.ms/OfficeSecurityReleases
(custom)
|
|
| Microsoft | Microsoft Office 2019 |
Affected:
19.0.0 , < https://aka.ms/OfficeSecurityReleases
(custom)
|
|
| Microsoft | Microsoft Office LTSC 2021 |
Affected:
16.0.1 , < https://aka.ms/OfficeSecurityReleases
(custom)
|
|
| Microsoft | Microsoft Office LTSC 2024 |
Affected:
16.0.0 , < https://aka.ms/OfficeSecurityReleases
(custom)
|
|
| Microsoft | Microsoft Word 2016 |
Affected:
16.0.1 , < 16.0.5565.1000
(custom)
|
Date Public
2026-08-11 14:00
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CVE-2026-65927 (GCVE-0-2026-65927)
Vulnerability from cvelistv5 – Published: 2026-08-25 21:53 – Updated: 2026-08-26 02:30
VLAI
EPSS
VEX
Title
Apache Tomcat: RewriteValve [N] restarts at the second rule and may bypass access control
Summary
Off-by-one Error vulnerability in Apache Tomcat impacting the [N] flag on the rewrite valves causes rewrite processing to restart at the second rule rather than the first rule.
This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.24, from 10.1.0-M1 through 10.1.57, from 9.0.0.M1 through 9.0.120.
The following versions were EOL at the time the CVE was created but are
known to be affected: from 8.5.0 through 8.5.100. Other unsupported versions may also be affected.
Users are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121 which fix the issue.
Severity
No CVSS data available.
CWE
- CWE-193 - Off-by-one Error
Assigner
References
2 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache Tomcat |
Affected:
11.0.0-M1 , ≤ 11.0.24
(semver)
Affected: 10.1.0-M1 , ≤ 10.1.57 (semver) Affected: 9.0.0.M1 , ≤ 9.0.120 (semver) Affected: 8.5.0 , ≤ 8.5.100 (semver) Unaffected: 7.0.0 , ≤ 7.0.109 (semver) Unaffected: 0 , < 7.0.0 (semver) |
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CVE-2026-63387 (GCVE-0-2026-63387)
Vulnerability from cvelistv5 – Published: 2026-08-20 17:53 – Updated: 2026-08-25 15:12
VLAI
EPSS
VEX
Title
Libevent: Off-by-one stack buffer overflow in dnsname_to_labels via crafted DNS server response
Summary
Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent has an off-by-one stack buffer overflow in evdns.c when dnsname_to_labels formats a name-bearing DNS record at the end of the 64 KB stack buffer allocated by evdns_server_request_format_response. The final-label check permits j plus label_len plus one to equal buf_len, after which the terminating null byte is written to buf[buf_len]. A crafted DNS server response containing PTR, CNAME, MX, NS, or SOA data can trigger the one-byte out-of-bounds write and crash or corrupt the process. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-25 15:11 UTC
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/libevent/libevent/security/adv… | x_refsource_CONFIRM |
| https://github.com/libevent/libevent/releases/tag… | x_refsource_MISC |
| https://github.com/libevent/libevent/releases/tag… | x_refsource_MISC |
Impacted products
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CVE-2026-58380 (GCVE-0-2026-58380)
Vulnerability from cvelistv5 – Published: 2026-07-06 13:58 – Updated: 2026-07-16 14:00
VLAI
EPSS
VEX
Title
Gimp: gimp: stack buffer overflow in pnmscanner_gettoken()
Summary
A flaw was found in GIMP's PNM file format parser. When parsing a specially crafted PNM file, the pnmscanner_gettoken() function writes a null terminator one byte past the end of a stack-allocated buffer due to an off-by-one error in the loop boundary check. This could lead to memory corruption, potentially resulting in denial of service or arbitrary code execution.
Severity
7.3 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-06 15:41 UTC
CWE
- CWE-193 - Off-by-one Error
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://access.redhat.com/errata/RHSA-2026:40751 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/security/cve/CVE-2026-58380 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2496135 | issue-trackingx_refsource_REDHAT |
| https://gitlab.gnome.org/GNOME/gimp/-/commit/83699817 | |
| https://gitlab.gnome.org/GNOME/gimp/-/issues/16206 |
Impacted products
4 products
| Vendor | Product | Version | |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
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|
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cpe:/o:redhat:enterprise_linux:6
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|
| Red Hat | Red Hat Enterprise Linux 7 |
cpe:/o:redhat:enterprise_linux:7
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|
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8
|
Date Public
2026-04-11 00:00
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CVE-2026-58374 (GCVE-0-2026-58374)
Vulnerability from cvelistv5 – Published: 2026-06-30 12:35 – Updated: 2026-06-30 13:38
VLAI
EPSS
VEX
Summary
In hostapd before 2.12, a missing bounds check in AP-mode Wi-Fi 7 (IEEE 802.11be) Multi-Link Operation (MLO) association request processing allows an unauthenticated attacker within wireless range to send a crafted management frame containing a malformed Multi-Link Element or Per-STA Profile subelement. In hostapd_process_ml_assoc_req() in src/ap/ieee802_11_eht.c, the received link_id field can be parsed as value 15, but the corresponding links[] storage only has valid entries for lower link IDs (0 through 14). This causes an out-of-bounds write / small memory corruption during association processing before the 4-way handshake. The attack does not require network credentials, prior authentication, or user interaction. The confirmed practical impact is denial of service through hostapd process termination. This affects hostapd v2.11 and newer development snapshots before v2.12 when built with CONFIG_IEEE80211BE enabled. The issue is fixed in hostapd v2.12 and the upstream 2026-1 fixes.
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-30 13:38 UTC
CWE
- CWE-193 - Off-by-one Error
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://w1.fi/security/2026-1/missing-ml-parsing-… | vendor-advisory |
| https://w1.fi/security/2026-1/ | vendor-advisorypatch |
| https://git.w1.fi/cgit/hostap/commit/?id=46dd5a4f… | patch |
| https://git.w1.fi/cgit/hostap/commit/?id=aa9d3458… | patch |
| https://www.openwall.com/lists/oss-security/2026/… |
Impacted products
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CVE-2026-58014 (GCVE-0-2026-58014)
Vulnerability from cvelistv5 – Published: 2026-06-30 12:57 – Updated: 2026-08-25 09:41
VLAI
EPSS
VEX
Title
Glib: off-by-one error in glib/gkeyfile.c via "g_key_file_get_locale_string_list"
Summary
A flaw was found in GLib. An off-by-one error can occur in the g_key_file_get_locale_string_list function in the gkeyfile.c file when loading a key file with an empty value. This flaw can cause an out-of-bounds access of 1 byte or a denial of service when the out-of-bounds access crosses a page boundary.
Severity
7.3 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-30 18:45 UTC
CWE
- CWE-193 - Off-by-one Error
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://access.redhat.com/errata/RHSA-2026:49512 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:55440 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:57015 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:58981 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/security/cve/CVE-2026-58014 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2492255 | issue-trackingx_refsource_REDHAT |
| https://gitlab.gnome.org/GNOME/glib/-/issues/3930 |
Impacted products
13 products
| Vendor | Product | Version | |
|---|---|---|---|
| GNOME | GLib |
Affected:
0 , < 2.88.1
(semver)
|
|
| Red Hat | Red Hat Enterprise Linux 10 |
Unaffected:
0:2.80.4-12.el10_2.21 , < *
(rpm)
cpe:/o:redhat:enterprise_linux:10.2 |
|
| Red Hat | Red Hat Enterprise Linux 8 |
Unaffected:
0:2.70.1-9.el8_10 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:8::crb |
|
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
0:2.68.4-19.el9_8.9 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:9::appstream cpe:/a:redhat:enterprise_linux:9::crb cpe:/o:redhat:enterprise_linux:9::baseos |
|
| Red Hat | Red Hat Update Infrastructure 5 |
Unaffected:
1787241211 , < *
(rpm)
cpe:/a:redhat:rhui:5::el9 |
|
| Red Hat | Red Hat Update Infrastructure 5 |
Unaffected:
1787135742 , < *
(rpm)
cpe:/a:redhat:rhui:5::el9 |
|
| Red Hat | Red Hat Update Infrastructure 5 |
Unaffected:
1787241260 , < *
(rpm)
cpe:/a:redhat:rhui:5::el9 |
|
| Red Hat | Red Hat Enterprise Linux 10 |
cpe:/o:redhat:enterprise_linux:10
|
|
| Red Hat | Red Hat Enterprise Linux 6 |
cpe:/o:redhat:enterprise_linux:6
|
|
| Red Hat | Red Hat Enterprise Linux 7 |
cpe:/o:redhat:enterprise_linux:7
|
|
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8
|
|
| Red Hat | Red Hat Enterprise Linux 9 |
cpe:/o:redhat:enterprise_linux:9
|
|
| Red Hat | Red Hat Hardened Images |
cpe:/a:redhat:hummingbird:1
|
Date Public
2026-04-07 00:00
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CVE-2026-56790 (GCVE-0-2026-56790)
Vulnerability from cvelistv5 – Published: 2026-06-25 18:14 – Updated: 2026-07-14 21:34 X_Open Source
VLAI
EPSS
VEX
Title
CANBoat - Off-by-One Global Buffer Overflow in searchForPgn()
Summary
CANBoat through 6.22, fixed in commit a5a22b7, contains an off-by-one global buffer overflow in the searchForPgn() function in analyzer/pgn.c that allows remote attackers to crash the application. Attackers can deliver a crafted NMEA-2000 message with an out-of-range PGN value over CAN bus or N2K-over-IP to trigger an out-of-bounds array access and denial of service.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-25 21:36 UTC
CWE
- CWE-193 - Off-by-one Error
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/canboat/canboat/issues/644 | technical-descriptionexploit |
| https://github.com/canboat/canboat/pull/649 | issue-tracking |
| https://github.com/canboat/canboat/commit/a5a22b7… | patch |
| https://www.vulncheck.com/advisories/canboat-off-… | third-party-advisory |
Impacted products
Date Public
2026-06-09 00:00
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CVE-2026-56787 (GCVE-0-2026-56787)
Vulnerability from cvelistv5 – Published: 2026-06-25 18:12 – Updated: 2026-07-14 21:34 X_Open Source
VLAI
EPSS
VEX
Title
RTKLIB 2.4.3 - Off-by-One Out-of-Bounds Read in decode_ssr3 via RTCM3 SSR Message
Summary
RTKLIB through 2.4.3 contains an off-by-one out-of-bounds read vulnerability in the decode_ssr3 function at src/rtcm3.c:1446 that allows remote attackers to trigger a global buffer overflow via crafted RTCM3 SSR messages with attacker-controlled signal mode fields. Remote attackers can exploit this vulnerability by sending malicious SSR correction streams over NTRIP or serial connections to cause denial of service or crash RTKLIB rovers and CORS servers.
Severity
6.5 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-25 18:27 UTC
CWE
- CWE-193 - Off-by-one Error
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/tomojitakasu/RTKLIB/issues/798 | technical-descriptionexploit |
| https://www.vulncheck.com/advisories/rtklib-off-b… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| tomojitakasu | RTKLIB |
Affected:
0 , ≤ 2.4.3
(semver)
|
Date Public
2026-06-09 00:00
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Mitigation
Implementation
When copying character arrays or using character manipulation methods, the correct size parameter must be used to account for the null terminator that needs to be added at the end of the array. Some examples of functions susceptible to this weakness in C include strcpy(), strncpy(), strcat(), strncat(), printf(), sprintf(), scanf() and sscanf().
No CAPEC attack patterns related to this CWE.