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Vulnerability details: VCID-t3np-c4np-kff8
Vulnerability ID VCID-t3np-c4np-kff8
Aliases CVE-2026-25210
Summary In libexpat before 2.7.4, the doContent function does not properly determine the buffer size bufSize because there is no integer overflow check for tag buffer reallocation.
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-190 Integer Overflow or Wraparound
System Score Found at
cvssv3 6.9 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-25210.json
epss 7e-05 https://api.first.org/data/v1/epss?cve=CVE-2026-25210
epss 7e-05 https://api.first.org/data/v1/epss?cve=CVE-2026-25210
epss 7e-05 https://api.first.org/data/v1/epss?cve=CVE-2026-25210
cvssv3.1 6.5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv3.1 6.9 https://github.com/libexpat/libexpat/pull/1075
ssvc Track https://github.com/libexpat/libexpat/pull/1075
cvssv3.1 6.9 https://github.com/libexpat/libexpat/pull/1075/commits/9c2d990389e6abe2e44527eeaa8b39f16fe859c7
ssvc Track https://github.com/libexpat/libexpat/pull/1075/commits/9c2d990389e6abe2e44527eeaa8b39f16fe859c7
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-25210.json
https://api.first.org/data/v1/epss?cve=CVE-2026-25210
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-25210
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
1075 https://github.com/libexpat/libexpat/pull/1075
1126697 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1126697
2435454 https://bugzilla.redhat.com/show_bug.cgi?id=2435454
9c2d990389e6abe2e44527eeaa8b39f16fe859c7 https://github.com/libexpat/libexpat/pull/1075/commits/9c2d990389e6abe2e44527eeaa8b39f16fe859c7
USN-8022-1 https://usn.ubuntu.com/8022-1/
USN-8022-2 https://usn.ubuntu.com/8022-2/
USN-8023-1 https://usn.ubuntu.com/8023-1/
No exploits are available.
Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-25210.json
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:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:L Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
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:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L Found at https://github.com/libexpat/libexpat/pull/1075
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:N/T:T/P:M/B:A/M:M/D:T/2026-02-03T15:53:34Z/ Found at https://github.com/libexpat/libexpat/pull/1075
Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L Found at https://github.com/libexpat/libexpat/pull/1075/commits/9c2d990389e6abe2e44527eeaa8b39f16fe859c7
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:N/T:T/P:M/B:A/M:M/D:T/2026-02-03T15:53:34Z/ Found at https://github.com/libexpat/libexpat/pull/1075/commits/9c2d990389e6abe2e44527eeaa8b39f16fe859c7
Exploit Prediction Scoring System (EPSS)
Percentile 0.0061
EPSS Score 7e-05
Published At June 5, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-04T16:35:47.827455+00:00 Debian Importer Import https://security-tracker.debian.org/tracker/data/json 38.6.0