Staging Environment: Content and features may be unstable or change without notice.
Search for vulnerabilities
Vulnerability details: VCID-xsde-1m6b-j7ds
Vulnerability ID VCID-xsde-1m6b-j7ds
Aliases CVE-2024-56522
GHSA-w95c-7994-ghpr
Summary An issue was discovered in TCPDF before 6.8.0. unserializeTCPDFtag uses != (aka loose comparison) and does not use a constant-time function to compare TCPDF tag hashes.
Status Published
Exploitability None
Weighted Severity None
Risk None
Affected and Fixed Packages Package Details
Weaknesses (4)
CWE-697 Incorrect Comparison
CWE-843 Access of Resource Using Incompatible Type ('Type Confusion')
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.00155 https://api.first.org/data/v1/epss?cve=CVE-2024-56522
cvssv3.1 7.5 https://github.com/tecnickcom/TCPDF
generic_textual HIGH https://github.com/tecnickcom/TCPDF
cvssv3.1 7.5 https://github.com/tecnickcom/TCPDF/commit/d54b97cec33f4f1a5ad81119a82085cad93cec89
generic_textual HIGH https://github.com/tecnickcom/TCPDF/commit/d54b97cec33f4f1a5ad81119a82085cad93cec89
ssvc Track https://github.com/tecnickcom/TCPDF/commit/d54b97cec33f4f1a5ad81119a82085cad93cec89
cvssv3.1 7.5 https://github.com/tecnickcom/TCPDF/compare/6.7.8...6.8.0
generic_textual HIGH https://github.com/tecnickcom/TCPDF/compare/6.7.8...6.8.0
ssvc Track https://github.com/tecnickcom/TCPDF/compare/6.7.8...6.8.0
cvssv3.1 7.5 https://lists.debian.org/debian-lts-announce/2025/06/msg00004.html
generic_textual HIGH https://lists.debian.org/debian-lts-announce/2025/06/msg00004.html
cvssv3.1 7.5 https://nvd.nist.gov/vuln/detail/CVE-2024-56522
generic_textual HIGH https://nvd.nist.gov/vuln/detail/CVE-2024-56522
cvssv3.1 7.5 https://tcpdf.org
generic_textual HIGH https://tcpdf.org
ssvc Track https://tcpdf.org
cvssv3.1 7.5 https://www.php.net/manual/en/types.comparisons.php
generic_textual HIGH https://www.php.net/manual/en/types.comparisons.php
ssvc Track https://www.php.net/manual/en/types.comparisons.php
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2024-56522
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-56522
https://lists.debian.org/debian-lts-announce/2025/06/msg00004.html
https://nvd.nist.gov/vuln/detail/CVE-2024-56522
1091688 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1091688
6.7.8...6.8.0 https://github.com/tecnickcom/TCPDF/compare/6.7.8...6.8.0
d54b97cec33f4f1a5ad81119a82085cad93cec89 https://github.com/tecnickcom/TCPDF/commit/d54b97cec33f4f1a5ad81119a82085cad93cec89
GHSA-w95c-7994-ghpr https://github.com/advisories/GHSA-w95c-7994-ghpr
tcpdf.org https://tcpdf.org
types.comparisons.php https://www.php.net/manual/en/types.comparisons.php
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://github.com/tecnickcom/TCPDF
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://github.com/tecnickcom/TCPDF/commit/d54b97cec33f4f1a5ad81119a82085cad93cec89
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-12-30T15:54:25Z/ Found at https://github.com/tecnickcom/TCPDF/commit/d54b97cec33f4f1a5ad81119a82085cad93cec89
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://github.com/tecnickcom/TCPDF/compare/6.7.8...6.8.0
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-12-30T15:54:25Z/ Found at https://github.com/tecnickcom/TCPDF/compare/6.7.8...6.8.0
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://lists.debian.org/debian-lts-announce/2025/06/msg00004.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2024-56522
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://tcpdf.org
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-12-30T15:54:25Z/ Found at https://tcpdf.org
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://www.php.net/manual/en/types.comparisons.php
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-12-30T15:54:25Z/ Found at https://www.php.net/manual/en/types.comparisons.php
Exploit Prediction Scoring System (EPSS)
Percentile 0.35986
EPSS Score 0.00155
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-10T18:34:10.317998+00:00 Vulnrichment Import https://github.com/cisagov/vulnrichment/blob/develop/2024/56xxx/CVE-2024-56522.json 38.6.0