CVE-2026-32777: libexpat_project libexpat Infinite Loop
CVSS: 5.5v3.1MediumModified
AliasesALPINE-CVE-2026-32777UBUNTU-CVE-2026-32777DEBIAN-CVE-2026-32777CGA-5fj7-v867-rpjmCGA-6x4m-w944-wv5g
Published 16-03-2026Last modified 15-10-2026
Vulnerability summary
CVE-2026-32777 is a medium (CVSS 5.5) Infinite Loop vulnerability in libexpat_project libexpat. EPSS estimates a 0.22% chance of exploitation in the next 30 days, higher than 11.7% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
5.5/10
010
Medium · v3.1 (NVD)EPSS score
0.22%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github
Advisory lineage
Upstream 0 · Downstream 18 · Related 17MGASA-2026-0061MGASA-2026-0145OPENSUSE-SU-2026:10466-1OPENSUSE-SU-2026:10620-1OPENSUSE-SU-2026:10642-1OPENSUSE-SU-2026:20448-1SUSE-SU-2026:1137-1SUSE-SU-2026:1159-1SUSE-SU-2026:1166-1SUSE-SU-2026:1352-1SUSE-SU-2026:20963-1SUSE-SU-2026:20985-1SUSE-SU-2026:21031-1SUSE-SU-2026:21062-1SUSE-SU-2026:4615-1SUSE-SU-2026:4619-1SUSE-SU-2026:4623-1USN-8790-1CGA-R9W5-H6W5-X2M3
Timeline
- 16-03-2026PublishedVulnerability first disclosed.
- 15-10-2026Last modifiedVulnerability information updated.
Description
libexpat before 2.7.5 allows an infinite loop while parsing DTD content.
CVSS metrics
7 scores · 7 sources · 1 versionMedium 5.5Preferred score · NVD (NIST)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HSources7 sources · 4.0–5.5
- CVE.orgCNA4.0MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:LDiffers
- OSV · AlpineEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · WolfiEcosystem advisory · calculated4.0MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:LDiffers
- OSV · ChainguardEcosystem advisory · calculated4.0MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:LDiffers
EPSS trend
Probability
0.22%
Chance of exploitation in the next 30 days
Percentile
12%
Versus all other CVEs
30-day change
0.00 pp
From 0.22% on 19-09-2026
19-09-202619-10-2026
EPSS score0.22%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundLibexpat
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Ubuntu16 products
- ayttmAll versions (No fix recorded)
- cableswigAll versions (No fix recorded)
- cadaverAll versions (No fix recorded)
- coin3All versions (No fix recorded)
- expat< 2.1.0-4ubuntu1.4+esm12 | < 2.1.0-7ubuntu0.16.04.5+esm13 | < 2.2.5-3ubuntu0.9+esm4 | < 2.2.9-1ubuntu0.8+esm2 | < 2.4.7-1ubuntu0.8 | < 2.6.1-2ubuntu0.5 | All versions (No fix recorded) | < 2.7.4-1ubuntu0.1
Alpine1 product
- expat< 2.7.5-r0
Chainguard1 product
- expat< 2.7.5-r0
Debian1 product
- expat< 2.5.0-1+deb12u4 | < 2.8.2-1~deb13u1 | < 2.7.5-1
Libexpat_project1 product
- libexpat< 2.7.5
Wolfi1 product
- expat< 2.7.5-r0
6 vendors · 21 products
